1. Product Title

PM DWDM Mux/Demux 100/200 GHz Polarization Maintaining Device

2. Product Overview

GracyFiber PM DWDM (Polarization Maintaining Dense Wavelength Division Multiplexer) is a high-density fiber optic device designed to combine or separate closely spaced optical wavelengths while preserving the polarization state of the transmitted signals. The product supports 100 GHz and 200 GHz channel spacing and is available in configurations from 2CH to 16CH.

3. Key Features

• 100 GHz / 200 GHz channel spacing
• 2CH / 4CH / 8CH / 16CH configurations
• Dense ITU-grid wavelength configuration
• Polarization-maintaining fiber design
• Stable polarization performance
• Low insertion loss
• High channel isolation
• Multiple fiber coating and package options

The supplied product documentation specifically identifies dense ITU-grid compatibility, multiple channel configurations, stable polarization performance, environmental stability, low insertion loss, high channel isolation, and 100/200 GHz spacing as product features.

4. Applications

• DWDM Systems
• Metro and Backbone Networks
• High-Capacity Coherent Communication
• Optical Amplifier Systems
• Fiber Sensing & FBG Interrogation
• Optical Test & Measurement

The supplied documentation explicitly lists these applications.

5. Technical Specifications

6. Configuration & Customization Options

Available Channel Configurations

• 3-Port
• 2CH
• 4CH
• 8CH
• 16CH

The product description separately states support from 2CH to 16CH.

Channel Spacing

• 100 GHz
• 200 GHz

Center Wavelength

• ITU Grid C11–C64
• Customized center wavelength

PM Fiber

• PM1300
• PM1550

Operating Axis

• Dual Axis
• Pass Port Single Axis

Fiber Coating / Cable

• 250 μm
• 900 μm
• 2.0 mm
• 3.0 mm
• Red / Blue loose tube

Connector

• FC/APC
• FC/UPC
• Customized connector

Package

• Cylindrical package
• Box package
• Rack-mount package

Exact package selection depends on the fiber/cable configuration and channel count.

7. Detailed Product Description

The GracyFiber PM DWDM combines dense wavelength-division multiplexing with polarization-maintaining fiber transmission. It is intended for optical systems where multiple closely spaced wavelength channels need to share a common fiber path without losing the required polarization characteristics.

The product description specifies 100 GHz and 200 GHz wavelength spacing in the C-band and channel configurations from 2CH to 16CH. This dense wavelength arrangement enables multiple optical carriers to be multiplexed or demultiplexed while using substantially less spectral spacing than conventional CWDM systems.

In addition to wavelength separation, the PM construction is important in systems where polarization is part of the optical architecture. The supplied specification provides dual-axis or pass-port single-axis configurations and specifies the relationship between the PM fiber axis and connector key.

Different channel counts have different insertion-loss, isolation, extinction-ratio, and return-loss requirements. This allows engineers to select the channel configuration according to system capacity and optical budget rather than treating every DWDM assembly as an identical optical component.

The product also supports multiple mechanical configurations, ranging from compact bare-fiber cylindrical packages to box and rack-mount assemblies. FC/APC, FC/UPC, and customized connector configurations are listed.

These characteristics make PM DWDM suitable for coherent transmission, wavelength-selective sensing, optical amplification, test systems, and other photonic architectures where both wavelength selectivity and polarization control are required.

8. Application Scenario

Application 1 — Coherent Optical Communication

In coherent optical systems, multiple closely spaced optical carriers may be transmitted across a common fiber while polarization characteristics remain important to system operation.

The PM DWDM provides wavelength multiplexing or demultiplexing together with polarization-maintaining fiber connectivity. The supplied product documentation specifically identifies high-capacity coherent communication as a target application.

Application 2 — Metro and Backbone DWDM Networks

For metro and backbone transmission systems, multiple wavelengths can be combined to increase the number of optical channels carried by a fiber link.

The 100 GHz / 200 GHz spacing and multiple channel configurations allow the PM DWDM to perform wavelength-selective combining or separation in DWDM architectures where PM transmission is required.

Application 3 — Fiber Sensing & FBG Interrogation

Fiber sensing and FBG interrogation platforms may use multiple optical wavelengths for measurement and signal acquisition.

The PM DWDM can separate or combine these wavelength channels while maintaining the required fiber polarization state. Fiber sensing and FBG interrogation are explicitly listed in the supplied application information.

9. Why GracyFiber

GracyFiber focuses on passive fiber optic components for optical communication, photonics, polarization-maintaining systems, and fiber interconnection.

For PM DWDM projects, the broader GracyFiber product portfolio includes:

• WDM / CWDM / DWDM components
• PM Fiber Components
• PM Couplers and Combiners
• PBS / PBC devices
• PM Collimators
• PM Isolators
• PM VOA
• Fiber Arrays and FAUs
• MPO/MTP fiber assemblies

For project-specific requirements, customers can provide channel count, ITU wavelength, spacing, PM fiber type, connector, package, and target optical performance for technical evaluation.

10. Related Products

11. FAQ

1. What is a PM DWDM?

A PM DWDM is a Polarization Maintaining Dense Wavelength Division Multiplexer/Demultiplexer that combines or separates closely spaced optical wavelengths while maintaining the polarization state.

GracyFiber’s product supports 100 GHz / 200 GHz wavelength spacing and multiple channel configurations.

2. What channel spacings are available?

The supplied specification provides:

• 100 GHz
• 200 GHz

The source lists 100 GHz as 0.8 nm spacing. The wavelength-equivalent value currently shown for 200 GHz requires confirmation before publication.

3. How many channels are available?

The supplied specification includes:

• 2CH
• 4CH
• 8CH
• 16CH

A separate 3-Port configuration is also shown in the technical specification sheet.

4. Which PM fiber types are available?

The current specification lists:

• PM1300
• PM1550

For other PM fiber requirements, please contact GracyFiber with the required wavelength, fiber type, and polarization configuration.

5. How do connectors affect PM DWDM performance?

According to the supplied specification, the listed performance values apply to devices without connectors.

For connectorized devices:

• IL is 0.3 dB higher
• RL is 5 dB lower
• ER is 2 dB lower

Connector configuration should therefore be included when defining the required optical specification for quotation.

12. Call to Action

For a PM DWDM quotation or technical evaluation, please provide:

• Operating wavelength / ITU channels
• 100 GHz or 200 GHz spacing
• Channel count
• PM fiber type
• Dual-axis or single-axis requirement
• Connector type
• Fiber coating / cable diameter
• Fiber length
• Package type
• Target insertion loss
• Required isolation
• Return loss
• Extinction ratio
• Application

GracyFiber can review the optical and mechanical configuration according to your PM DWDM system requirements.