1. Product Title

CWDM / CCWDM Multiplexer, 2–18CH, 20 nm Channel Spacing

2. Product Overview

GracyFiber CWDM / CCWDM Multiplexer provides wavelength multiplexing and demultiplexing for optical networks requiring multiple channels over a single fiber infrastructure. The product family supports 2CH, 4CH, 6CH, 8CH, and 18CH configurations with 20 nm channel spacing across an operating wavelength range of 1260–1660 nm.

3. Key Features

• 2CH / 4CH / 6CH / 8CH / 18CH configurations
• 20 nm channel spacing
• 1260–1660 nm operating wavelength range
• Two center-wavelength grid options
• CWDM and lower-loss CCWDM configurations
• Adjacent isolation ≥30 dB
• Non-adjacent isolation ≥40 dB
• Multiple compact and rack-mount package options
• Glue-free metal-bonded packaging
• Customizable optical configurations

The supplied documentation also states compliance with ITU-T G.694.2 and certification to Telcordia GR-1209/1221.

4. Applications

• Metro Access Networks
• 5G Fronthaul / Midhaul
• FTTx Networks
• Enterprise Networks
• Data Center Interconnect (DCI)
• CATV Overlay
• Edge Computing
• Small Cell Networks

These applications are explicitly listed in the supplied documentation.

5. FAQ

What is the difference between CWDM and CCWDM in this product family?

Both versions provide wavelength multiplexing/demultiplexing with the same listed 20 nm channel spacing and channel configurations. The supplied specification distinguishes them primarily through insertion loss and package dimensions.

For example, the maximum insertion loss of the 8CH version is:

• CWDM: 2.6 dB
• CCWDM: 2.0 dB

The exact internal structural difference between the two versions is not defined in the supplied documentation.

How many channels are available?

The parameter sheet lists:

• 2CH
• 4CH
• 6CH
• 8CH
• 18CH

All configurations use a listed 20 nm channel spacing.

Which CWDM wavelengths are available?

The supplied specification lists two center-wavelength grid options:

1270 / 1290 / 1310 / … / 1570 / 1590 / 1610 nm

or

1271 / 1291 / 1311 / … / 1571 / 1591 / 1611 nm

The operating wavelength range is specified as 1260–1660 nm.

What is the channel passband?

The minimum channel passband is specified as:

±6.5 nm

with 20 nm channel spacing.

Can the CWDM / CCWDM Multiplexer be customized?

The supplied product documentation describes the product family as fully customizable, and the parameter sheet explicitly lists customized connector options.

For a project-specific configuration, please provide the required wavelength channels, channel count, package, fiber type, connector, and optical-performance requirements.

6. Technical Specifications

General Specifications

Insertion Loss by Channel Count

Isolation & Ripple

Package Dimensions

CWDM

• 80 × 58 × 8 mm
• 120 × 80 × 18 mm
• 155 × 129 × 29 mm
• 482 × 250 × 44 mm

CCWDM

• 45 × 25 × 6 mm
• 50 × 50 × 6 mm
• 60 × 45 × 6 mm

The product description additionally refers to standard 1U rack-mounted systems and an ultra-compact 18-channel module.

7. Configuration & Customization Options

Channel Count

Available:

• 2CH
• 4CH
• 6CH
• 8CH
• 18CH

Center Wavelength

Available wavelength grids:

• 1270 / 1290 / 1310 / … / 1610 nm
• 1271 / 1291 / 1311 / … / 1611 nm

Fiber

Listed:

• G67A1 / A2 / B3
• SMF-28

Exact fiber designations require confirmation.

Fiber Coating

• 250 μm
• 900 μm loose tube

Connector

• LC/UPC
• Customized

Package

Multiple CWDM and CCWDM dimensions are available according to the specification table.

The source also states that the products can be tailored to spatial constraints and performance requirements.

8. Detailed Product Description

The GracyFiber CWDM / CCWDM Multiplexer is designed to increase fiber utilization by combining multiple wavelength channels onto a common optical fiber and separating them again at the receiving side.

The supplied configuration uses 20 nm wavelength spacing and supports channel counts from 2CH to 18CH. Two wavelength-grid formats are provided, using center wavelengths ending in either “0” or “1,” allowing the optical channel plan to be selected according to the required system configuration.

CWDM and CCWDM versions share the same listed wavelength-grid, passband, isolation, PDL, return-loss, and directivity requirements, while their insertion-loss specifications differ. The CCWDM version has lower listed maximum insertion loss across all available channel counts. For example, the 18CH configuration is specified at 4.2 dB maximum for CWDM and 2.5 dB maximum for CCWDM.

Mechanical packaging also differs between the two product families. CWDM packages include larger module and rack-mount formats, while CCWDM dimensions are listed from 45 × 25 × 6 mm to 60 × 45 × 6 mm, making them suitable where installation space is limited.

The supplied documentation also specifies glue-free metal-bonded packaging and describes the family as fully customizable.

These configurations support wavelength-management requirements in access, transport, enterprise, data center, and mobile optical-network architectures.

9. Application Scenario

Application 1 — 5G Fronthaul / Midhaul

5G transport networks may require multiple optical channels between radio, aggregation, and network equipment.

A CWDM or CCWDM multiplexer allows several wavelength channels to share the same fiber infrastructure while maintaining individual wavelength paths. The supplied documentation specifically identifies 5G fronthaul and midhaul as applications.

Application 2 — Data Center Interconnect

For DCI links, wavelength multiplexing can increase the number of optical channels carried across an existing fiber connection.

The 2CH–18CH configurations allow the wavelength count to be selected according to link requirements, while compact CCWDM packaging can be considered when equipment space is constrained. DCI is explicitly listed as an application.

Application 3 — FTTx and Metro Access Networks

CWDM / CCWDM can be used in access networks where several wavelength services need to share fiber infrastructure.

The supplied application list specifically includes both Metro Access Networks and FTTx.

10. Why GracyFiber

GracyFiber supplies passive wavelength-management and fiber-optic components for telecom, data-center, access-network, and optical-interconnect applications.

The related GracyFiber portfolio includes:

• CWDM / CCWDM
• DWDM
• AAWG DWDM
• MWDM
• LWDM
• UCWDM
• OADM
• WDM-PON components
• PM DWDM
• Fiber optic connectivity products

For CWDM / CCWDM projects, customers can provide the required wavelength plan, channel count, optical budget, package, fiber interface, and connector configuration for technical evaluation.

11. Related Products

12. Call to Action

For a CWDM / CCWDM Multiplexer quotation or technical evaluation, please provide:

• CWDM or CCWDM
• Channel count
• Required center wavelengths
• Special / monitor port requirement
• Fiber type
• Fiber coating
• Fiber length
• Connector
• Package dimensions
• Target insertion loss
• Required isolation
• Application

GracyFiber can review the required optical and mechanical configuration for your wavelength-multiplexing project.