BWN-FPC is a manual paddle controller for setting the state of polarization in a single-mode fiber path. The ordered build is defined by its wavelength, installed fiber, paddle count, loop diameter, terminations, and lead length. It suits bench and component-test setups where an operator can watch a polarimeter, transmitted power through a polarization-sensitive device, or another defined response during adjustment.
For a configuration review, send the application, wavelength, fiber format, connector, paddle count, loop preference, lead length, optical power, and quantity. BWNFiber can use those inputs to identify an available build for technical confirmation and quotation. Request a BWN-FPC configuration review when those inputs are ready.
Quick answer: Which BWN-FPC configuration should you order?
Paddle count alone does not define the controller. Start with the required polarization change and the way it will be monitored. Then select the fiber and wavelength, loop geometry, terminations, power condition, and test boundary. Release the order only when the quotation and drawing describe the same build.
BWNFiber presents BWN-FPC as a configurable product family. The purchase rule is therefore simple: one quoted build should return with one matched configuration record, one applicable drawing, one set of optical limits, and one agreed test boundary.
Key takeaways for purchasing BWN-FPC
- Paddle count, fiber, wavelength, loop geometry, winding, and monitoring method define the useful transformation together.
- The published 480 to 2400 nm range describes the configurable family, not one universal assembly.
- The published 0.2 dB insertion loss is typical including connectors; it is not a maximum order-acceptance limit.
- BWN-FPC is manually adjusted and does not provide automatic polarization tracking.
- Release the purchase order only when the configuration record, drawing, quotation, optical limits, and test boundary describe the same build.
On this page
- Configuration and published specifications
- Fiber, connector, and system compatibility
- Applications and fit boundaries
- Configuration selection
- Quotation comparison
- Buyer checklist and procurement path
- Setup and handling
- Testing and quality control
- International purchasing information
- Documents to request
- Frequently asked questions
- Request a configuration review
BWN-FPC configuration summary
| Selection field | Published BWN-FPC options | What the order must define |
|---|---|---|
| Product model | BWN-FPC | Exact option or configuration code |
| Control method | Manual paddle-based polarization adjustment | Whether manual open-loop adjustment fits the required stability and tracking behavior |
| Fiber mechanism | Stress-induced birefringence in single-mode fiber looped around rotating paddles | Installed fiber, loop pattern, and design wavelength |
| Paddle count | 2 or 3 | Required transformation freedom, footprint, and monitoring method |
| Loop diameter | 18 mm for two paddles; 27 mm or 56 mm for three paddles | Selected fiber, wavelength, winding, and available fiber length |
| Fiber format | 0.9 mm tube standard; 3 mm jacketed option subject to configuration confirmation | Supported channel, buffer or cable construction, loading, and diameter tolerance |
| Fiber length | 0.25 m or customized | Total fiber length and usable lead length on each side |
| Connector | None, FC/PC, or FC/APC; the published preloaded option specifies a 2.0 mm narrow key | Connector polish, key width, end condition, and whether both ends are included |
| Product-family wavelength claim | 480 to 2400 nm | Exact installed fiber, loop configuration, connector build, and qualified operating band; the family range is not a guarantee for one assembly |
| Insertion loss | 0.2 dB typical including connectors | Test wavelength, fiber, connector condition, reference method, paddle positions, and maximum acceptance value |
| Return loss | Published information lists 55 dB for FC/APC connectors | Test method and whether the value applies to the complete quoted assembly |
| Optical power | Published information lists 0.5 W | Applicability to the selected fiber, connectors, wavelength, duty condition, and system location |
| Materials | Published information identifies an aluminum base and Delrin paddles | Approved drawing and material specification if materials are purchase-controlled |
This family-level table is a sourcing reference only, not a guarantee for any assembly. The quotation, approved drawing, configuration record, and order specification govern the supplied build. Do not turn the 0.2 dB typical value, the 0.5 W platform claim, or the 3 mm option into an order-acceptance limit without the applicable conditions.
What the manual paddle controller does
Each paddle bends the installed fiber and rotates the induced birefringence axis relative to the transmitted polarization. The operator turns the paddles while watching a defined polarization-sensitive result, such as a polarimeter reading, a component response, or another test metric.
A three-paddle arrangement is commonly treated as an approximate quarter-wave, half-wave, quarter-wave sequence at its design condition. Actual retardance still depends on wavelength, fiber geometry, loop diameter, and loop count. Three paddles do not prove complete state coverage when the fiber and wavelength are unspecified.
A paddle controller acts as an adjustable retarder, not as a polarizer. It transforms an existing state of polarization. It does not create fully polarized light from an unpolarized or depolarized source.
Main features
- Two- or three-paddle manual configurations
- 18 mm loop for two paddles; 27 mm or 56 mm loops for three paddles
- Single-mode fiber path with no connectors, FC/PC, or FC/APC terminations
- Order-specific installed fiber and lead length
- Visible, hands-on adjustment while the operator monitors the result
Interfaces, fiber type, and compatibility
Fiber compatibility
BWN-FPC is offered for single-mode fiber. Specify a fiber that remains single mode across the required band and can tolerate the selected loop geometry. "Single-mode" alone is not an orderable fiber specification; the buffer or cable construction, connector build, and optical power also affect the assembly.
Published BWN-FPC information lists a 0.9 mm tube as standard and a 3 mm jacketed option subject to configuration confirmation. Any 3 mm build remains order-specific until the drawing identifies the supported channel, loading method, and tolerance. A 3 mm outside diameter is a physical format, not an environmental rating; it does not establish jacket material, LSZH, flame, UV, water, or rodent resistance.
Single-mode, PM fiber, and multimode boundaries
The published BWN-FPC configuration uses application-matched single-mode fiber. A telecom designation such as G.652.D or G.657.A1/A2 does not by itself qualify a fiber for a paddle controller; the exact fiber, wavelength, loop geometry, and winding still need review. OM3, OM4, and OM5 are multimode cabling grades and are not substitutes for the ordered single-mode path.
If the downstream device uses polarization-maintaining fiber, define its launch axis, termination, and polarization extinction ratio measurement at the system level. That does not establish that the preloaded BWN-FPC fiber is a PM fiber unless the order record states it.
Connector compatibility
Published connector choices are no connectors, FC/PC, or FC/APC. The live BWNFiber page observed on 2026-08-28 specifies a 2.0 mm narrow key for its published preloaded connector option. Use matching polish on mating interfaces. An adapter may allow an FC/PC plug and an FC/APC plug to connect mechanically, but that does not make the pair a valid optical interface. State the polish, key width, lead length, and whether the insertion-loss boundary includes both connectors.
System compatibility
The controller fits static or slowly adjusted laboratory and component-test setups in which an operator can observe the result. A manual paddle controller does not provide automatic tracking. If the system requires remote actuation, rapid compensation, or continuous control under changing environmental conditions, evaluate a motorized or feedback-controlled architecture instead.
Typical applications
| Application | Appropriate manual-control task | Inputs to confirm before selection |
|---|---|---|
| Component testing | Set or vary the input state before a polarization-sensitive component | Test wavelength, input state, required output states, loss boundary, and monitoring instrument |
| PDL measurement | Present multiple input states to a device under test | State-coverage method, reference stability, test procedure, and whether manual stepping is acceptable |
| Fiber laser setup | Tune a static or slowly varying polarization condition at a defined point | Wavelength, fiber, optical power, cavity or external location, feedback risk, and stability requirement |
| Fiber sensing | Optimize launch or receive polarization in a controlled setup | Sensor architecture, drift, repeatability, environment, and need for remote control |
| Optical coherence tomography (OCT) laboratory setup | Adjust a monitored polarization-sensitive path during setup or evaluation | OCT architecture, wavelength, installed fiber, drift, adjustment frequency, and whether active tracking is required |
| Optical communication laboratory work | Align a test state before a polarization-sensitive device | Channel band, loss budget, state monitoring, and whether polarization tracking is required |
| General optical test bench | Provide visible, manual polarization adjustment | Mounting space, fiber handling, connector interface, and adjustment procedure |
Use the application row as a starting point, then check the ordered fiber, wavelength, power, connectors, mechanical envelope, and adjustment method against the actual setup.
If it is unclear whether a manual paddle controller fits the system, send the required polarization task, wavelength, fiber path, monitoring method, and adjustment frequency before selecting a loop size or connector build.
How to select a BWN-FPC configuration
- Define the required input-to-output change, the monitoring instrument, and whether an operator can make the adjustment manually.
- Fix the operating wavelength and specify the fiber, including its buffer or cable diameter.
- Choose three paddles when the setup needs broader manual adjustment freedom. Use two only for a constrained, verified transformation.
- Start with 18 mm for the published two-paddle layout or 27 mm/56 mm for the published three-paddle layouts, then check the selected fiber's bend behavior, winding, available length, and bench space.
- Define the connector polish, lead length, optical power, test wavelength, loss reference planes, and acceptance limit.
- Reconcile the quotation, configuration summary, drawing, datasheet, and agreed test evidence before releasing the purchase order.
How to compare manual polarization controller quotations
Do not compare two quotations by paddle count and unit price alone. Normalize each offer against the same application and record the result in one comparison sheet.
| Comparison field | What each supplier should identify | Reject or clarify when |
|---|---|---|
| Controller architecture | Paddle, fiber-squeezer, free-space wave plate, motorized, or feedback-controlled | Different mechanisms are presented as equivalent without stating their operating limits |
| Order identity | Manufacturer, model, option or configuration code, and revision | The quote cannot be tied to one reproducible build |
| Delivered state | Empty controller, customer-loaded fiber, preloaded fiber, pigtailed assembly, or connectorized assembly | The price does not identify what fiber and terminations are included |
| Optical configuration | Operating wavelength, installed fiber, paddle count, loop diameter, and winding | A family wavelength range is used in place of a configuration-specific band |
| Mechanical interface | Fiber format, loading method, footprint, mounting details, lead exit, and drawing revision | A cable diameter is listed without a compatible channel or loading drawing |
| Connector interface | Connector type, polish, key width, lead length, and included mating accessories | FC/PC and FC/APC are grouped under one unspecified connector option |
| Loss boundary | Typical value, maximum value, wavelength, reference planes, connector inclusion, and paddle condition | A typical value is presented as the purchase-acceptance limit |
| Polarization evidence | Required output states or response, monitoring instrument, state-coverage method, and repeatability condition | "Any state" is claimed without a defined fiber, wavelength, setup, or verification method |
| Documentation | Datasheet, configuration record, drawing, loading or operating instruction, and available test record | Product literature and the quotation describe different builds |
| Commercial terms | Quantity, sample or prototype route, MOQ, lead time, Incoterm, warranty, packaging, and destination | Delivery or service claims have no order-specific confirmation |
This comparison does not make the lowest loss, largest wavelength range, or lowest price universally preferable. The selected offer must match the required transformation, fiber path, handling constraints, measurement method, and purchase evidence.
BWN-FPC buyer checklist and procurement path
| Purchase stage | Buyer decision | Required output before moving forward |
|---|---|---|
| Problem and application | Define the polarization-sensitive result and decide whether manual adjustment is acceptable | Application statement, monitoring method, adjustment frequency, and stop condition |
| Product type | Compare paddle, fiber-squeezer, motorized or feedback, and free-space options | Selected architecture with the reason alternatives were rejected |
| Technical configuration | Fix wavelength, fiber, paddle count, loop diameter, winding, connector, lead length, and power condition | One configuration summary tied to an option or configuration code |
| Supplier and evidence review | Normalize quotations and inspect the applicable drawing, datasheet, instructions, and available test evidence | A reconciled technical package with open items identified |
| Commercial review | Confirm quantity, sample or prototype route, price, lead time, Incoterm, warranty, packaging, and destination | An order-specific quotation that identifies inclusions, exclusions, and validity |
| Purchase release | Resolve differences across the quote, drawing, specification, and test boundary | One approved order specification for the exact supplied build |
How BWNFiber supports a BWN-FPC configuration review
Send the application and configuration inputs rather than a product name alone. BWNFiber can review those inputs against available BWN-FPC options and prepare an order-specific response for confirmation. Ask the response to identify:
- The proposed configuration or option code and what will be delivered
- Confirmed, conditional, and unavailable requirements
- The applicable drawing and current technical-document status
- Optical limits that apply to the proposed assembly
- Available sample, prototype, inspection, or test-evidence routes
- Quantity, commercial terms, and quotation validity
This review supports supplier screening and inquiry preparation. It does not replace the buyer's system validation, engineering approval, or purchase specification.
Two paddles or three paddles?
| Decision factor | Two-paddle configuration | Three-paddle configuration |
|---|---|---|
| Adjustment freedom | Suitable only when the required transformation is constrained and verified | Preferred starting point when broader manual state adjustment is required |
| Published loop options | 18 mm | 27 mm or 56 mm |
| Footprint | Uses the two-paddle envelope | Requires the envelope of three independently rotating paddles |
| Setup | Fewer elements to adjust | More adjustment variables and more freedom |
| Procurement check | Confirm that the required input-to-output transformation can be reached with the selected fiber and wavelength | Confirm loop pattern and design wavelength rather than assuming ideal wave-plate behavior |
Neither choice is universally better. Paddle count only has meaning within a defined fiber, wavelength, loop diameter, and loop count.
How loop diameter changes the selection
Loop diameter is a design input, not a quality grade. A smaller loop saves space but may increase bend sensitivity for some fibers and wavelengths. A larger loop reduces curvature but uses more fiber and bench space. Use the loop pattern supplied for the quoted fiber and wavelength; a loop count taken from another fiber or controller is not transferable evidence.
Do not convert a nominal loop diameter into a minimum bend radius unless the drawing defines where that diameter is measured. The installed fiber's bend limit still governs loading, handling, and transport.
Common specification mistakes to avoid
| Mistake | Why it creates risk | Better purchase control |
|---|---|---|
| Choosing only by paddle count | Paddle count does not define retardance or state coverage | Approve the fiber, wavelength, loop diameter, winding, and monitored transformation together |
| Treating 480 to 2400 nm as one assembly band | It is a product-family claim, not one universal optical build | Require the qualified band for the quoted fiber and connector assembly |
| Treating loop diameter as minimum bend radius | The two dimensions may use different reference points | Use the dimensioned drawing and the selected fiber's bend limits |
| Treating 0.2 dB typical as a maximum | A typical value is not an acceptance threshold | Put a maximum value and complete test boundary in the order specification |
| Assuming a 3 mm format proves environmental performance | Outside diameter does not establish material or environmental ratings | Specify the physical construction and any required rating separately |
| Copying a loop pattern from another controller | Retardance changes with fiber geometry, wavelength, loop diameter, and loop count | Use the winding approved for the quoted configuration |
| Using OTDR as the default acceptance test | OTDR and end-to-end attenuation answer different questions on a short assembly | State the required method, instrument, reference planes, uncertainty, and limit |
| Expecting passive manual tracking | Paddle position is open-loop and operator controlled | Use motorized or feedback control when the state must follow time-varying conditions |
BWN-FPC versus adjacent controller types
| Controller type | How it changes polarization | Best fit | Main limitation to check |
|---|---|---|---|
| BWN-FPC manual paddle controller | Fiber is looped around rotating paddles to create adjustable retarders | Visible, hands-on laboratory adjustment with a continuous fiber path | Fiber, wavelength, loop pattern, footprint, and manual drift response |
| Manual fiber-squeezer controller | Pressure and axis rotation induce birefringence without a paddle loop arrangement | Compact manual integration where the specified fiber format is supported | Pressure range, locking, fiber compatibility, and mechanism-specific limits |
| Motorized or feedback controller | Actuators change the polarization state under remote or closed-loop control | Repeatable sequences, remote adjustment, or time-varying compensation | Control speed, range, endless operation, software, and system integration |
| Free-space wave-plate assembly | Rotating optical wave plates act on a collimated beam | Systems that already include a controlled free-space section | Alignment, coupling loss, beam parameters, and mechanical stability |
Practical setup, receipt inspection, and handling
These checks address common bench and acceptance risks without claiming a configuration-specific BWN-FPC test result:
- Match the received label, fiber, loop arrangement, connector polish, and lead orientation to the approved drawing or configuration record.
- Inspect the fiber route, leads, and connector end faces after shipment. Do not change the winding or reload a preloaded fiber unless the approved loading instruction permits it.
- Mount the base so paddle rotation does not pull or twist the input and output leads. Leave controlled slack outside the paddle path.
- Inspect and clean connector end faces, then establish the optical reference at the agreed wavelength and reference planes before adjusting polarization.
- Rotate the paddles while monitoring the defined metric. Record the source, wavelength, reference condition, paddle positions, and measured response; paddle angles from another build are not transferable settings.
- For receipt acceptance, repeat the agreed position or sweep method. For a custom fiber, termination, cover, or power condition, request a prototype and acceptance evidence before releasing a production quantity.
Mechanical stress, lead movement, and temperature changes elsewhere in a single-mode path can also change the measured state of polarization. Stabilize the complete path before attributing drift to the controller. This is a setup boundary, not a published BWN-FPC stability specification.
Test and quality-control requirements
Set the acceptance evidence before comparing quotations. The BWN-FPC order record should identify:
- Product model and exact configuration or option code
- Installed fiber, buffer or cable format, and total/lead length
- Paddle count, loop diameter, and recommended loop pattern
- Connector type, polish, key width, and end condition
- Qualified operating wavelength or band for the installed assembly
- Insertion-loss test boundary, reference method, wavelength, and acceptance value
- Return-loss evidence when it is a purchase requirement
- Optical-power applicability to the selected assembly
- Mechanical drawing and any agreed inspection or test record
Family-page data, competitor specifications, and a quotation do not describe the same tested build. If the page, drawing, datasheet, and quotation disagree, obtain one corrected order record before approval.
Technical references and their limits
H. C. Lefevre's original 1980 paper describes single-mode fiber fractional-wave devices based on bend-induced stress birefringence. It supports the operating principle, not a BWN-FPC product specification.
When standardized optical reporting is required, identify the applicable method in the purchase order. IEC 61300-3-4:2023 covers attenuation measurement for fibre-optic interconnecting devices and passive components. IEC 61300-3-6:2008 covers return-loss measurement for a device under test. NIST SP 250-60 documents a measurement-assurance program for wavelength-dependent PDL from 1535 to 1560 nm and discusses measurement uncertainty; it is not a universal BWN-FPC test method.
An OTDR trace and an end-to-end insertion-loss measurement answer different questions. Do not substitute an OTDR result for the agreed short-assembly attenuation method unless the purchase specification defines the instrument, resolution, launch/receive conditions, and acceptance logic.
These references do not establish BWN-FPC compliance. The quoted assembly still needs an agreed method, equipment, reference plane, wavelength, connector boundary, uncertainty, and acceptance value.
What changes price and lead time?
No universal BWN-FPC price or lead time can be inferred from the family page. Request commercial terms only after the configuration is fixed. Factors that may change a quotation include:
| Quotation factor | What to define |
|---|---|
| Delivered state | Empty controller, customer-loaded unit, preloaded fiber, pigtails, or connectorized assembly |
| Optical build | Wavelength, installed fiber, paddle and loop arrangement, connector polish, and lead length |
| Nonstandard requirement | Custom fiber, cable format, winding, termination, drawing, label, or documentation |
| Verification scope | Inspection, attenuation or return-loss evidence, special reference method, and required records |
| Order scope | Sample or prototype request, production quantity, packaging, accessories, and destination |
| Commercial boundary | MOQ, lead time, quotation validity, Incoterm, warranty, and any excluded cost |
Compare price and schedule only when suppliers are quoting the same delivered state, test boundary, documentation, and quantity.
Packaging and procurement information
Packaging, labeling, accessories, documentation, sample availability, MOQ, lead time, Incoterm, and export requirements are order-specific. After the optical build is fixed, add the quantity, destination, packaging or label instructions, required documents, sample request, and target schedule to the RFQ. The quotation should state what is included, excluded, or still subject to confirmation.
For a nonstandard fiber, termination, cover, winding, or power condition, ask whether a sample or prototype route is available before releasing a production quantity. The response should state the sample configuration, evidence supplied, cost, and schedule; availability is not assumed.
International purchasing information
For an international quotation, identify the ship-to country, postal code, buyer or importer role, requested Incoterm, quantity, target schedule, label instructions, document language, and any purchaser-mandated declaration or test record. Ask BWNFiber to confirm which documents and commercial terms are available for the quoted configuration and destination before purchase release.
Do not infer regulatory compliance, environmental suitability, customs treatment, or delivery time from the product-family page. If a project requires a specific declaration, restricted-substance document, certificate, inspection record, country-of-origin statement, packing list format, or export label, name it in the RFQ and require order-specific confirmation. Climate claims used for outdoor telecom cable are not a substitute for defined storage, transport, and laboratory-use conditions for this controller.
For a sample, prototype, distributor order, or staged project purchase, state the quantity at each stage and the evidence required to approve the next stage. The quotation should separate confirmed inclusions from conditional or unavailable requests.
Documents to request before purchase
Ask which revision-controlled documents are available for the exact quoted configuration:
- BWN-FPC model datasheet with revision date
- Dimensioned drawing for each paddle/loop configuration
- Configuration and ordering matrix
- Fiber-loading or operating instructions
- Order-level test-boundary example
- RFQ worksheet for wavelength, fiber, connectors, power, quantity, and documentation
A document for another fiber, loop, or connector build is a reference, not acceptance evidence for the quoted assembly. Request the current datasheet, applicable drawing, and available test-document list with the configuration review.
Related BWNFiber resources
- Review the fiber optic test equipment and tools category.
- Compare custom fiber cable assemblies for connectorized lead and assembly requirements.
- Check fiber optic patch-cord options for related connector and fiber formats.
- Send the BWN-FPC configuration inputs when the requirement is ready for review.
Frequently asked questions
What is a manual fiber polarization controller?
It is a passive, hand-adjusted device that changes the state of polarization in a fiber. In a paddle design, the fiber is looped around rotating spools so bending induces birefringence and paddle rotation changes the effective axes.
Is BWN-FPC a two-paddle or three-paddle controller?
Published BWNFiber information lists both two- and three-paddle configurations. Select the paddle count together with the fiber, wavelength, loop diameter, and required transformation.
Is three-paddle always better than two-paddle?
No. Three paddles normally offer more manual adjustment freedom. Two paddles may suit a constrained, verified transformation or a smaller mechanism. The correct choice depends on the complete optical and mechanical setup.
Which loop diameters are available?
Published BWN-FPC information maps 18 mm to the two-paddle layout and 27 mm or 56 mm to the three-paddle layouts. The selected fiber, wavelength, and winding still need confirmation.
Can one BWN-FPC assembly operate from 480 to 2400 nm?
Not as one universal build. The 480 to 2400 nm figure is a product-family range. A specific assembly still needs an installed fiber, loop pattern, connector build, and qualified band matched to the application.
Does BWN-FPC support 0.9 mm and 3 mm fiber formats?
Published information lists a 0.9 mm tube as standard and a 3 mm jacketed option subject to configuration confirmation. Any 3 mm build still needs a drawing that identifies its channel, loading, and tolerance.
Are FC/PC and FC/APC connectors interchangeable?
No. Specify one polish and use matching mating interfaces. Do not mate FC/PC and FC/APC as an operating optical pair.
What insertion loss should be used for acceptance?
The live BWNFiber page observed on 2026-08-28 lists 0.2 dB typical including connectors. Use the maximum in the reconciled order specification for acceptance. The test must define wavelength, fiber, loop configuration, connector condition, reference method, and paddle positions or sweep.
Can the controller track a changing polarization state automatically?
No. BWN-FPC is manually adjusted. A system that requires automatic, remote, or continuous tracking should be evaluated for a motorized or feedback-controlled controller.
What information is needed for a quotation?
Send the application, wavelength, fiber format, connector, paddle count, loop diameter or footprint, lead length, optical power, test limits, documentation, quantity, and delivery destination.
How does loop diameter affect a manual fiber polarization controller?
Loop diameter changes the bend applied to the installed fiber and therefore works with fiber type, wavelength, and loop count to determine retardance. It also changes the controller footprint. Do not choose 18 mm, 27 mm, or 56 mm as a performance grade; approve the complete fiber-and-loop configuration.
What is the difference between a paddle controller and a fiber-squeezer controller?
A paddle controller bends and rotates fiber loops to create adjustable retardance. A fiber-squeezer controller applies controlled pressure and rotates the induced axis. Both are manual architectures, but their supported fiber format, adjustment method, footprint, and qualification data are different and should not be treated as interchangeable.
Request a BWN-FPC configuration review
Send BWNFiber the application, wavelength, fiber, paddle count, loop diameter, connector, lead length, optical power, test requirements, quantity, target schedule, and destination. Request one matched package: configuration summary, applicable drawing, available technical documents, confirmed optical limits, sample or prototype status when needed, and an order-specific quotation. If those records conflict, ask for a corrected order specification before placing the purchase order.
