1. Product Title

Ultra Compact WDM (UCWDM) – CWDM, LWDM & DWDM Mini Modules

2. Product Overview

GracyFiber Ultra Compact WDM (UCWDM) series is a miniaturized wavelength-division multiplexing solution based on a free-space optical architecture. Designed for applications where package size and optical performance must be balanced, the series supports CWDM, LWDM, and DWDM wavelength configurations with channel counts from 4CH to 18CH, depending on the WDM type.

3. Key Features

• Ultra-compact free-space optical architecture
• Mini package starting from 20 × 8 × 6.5 mm
• Supports CWDM, LWDM, and DWDM wavelength configurations
• Available in 4CH / 8CH / 12CH / 16CH / 18CH, depending on WDM type
• Low insertion loss
• Adjacent channel isolation: ≥30 dB
• Non-adjacent channel isolation: ≥40 dB
• Multiple wavelength plans and channel spacings
• LC/UPC or customized connector options
• Flexible configuration for compact optical systems

The supplied product description specifically highlights the ultra-compact structure, low insertion loss, high isolation, wide-temperature capability, and rapid customization capability.

4. Applications

• 5G Fronthaul Networks
• 100G to 800G DWDM / Hybrid WDM Systems
• Data Center Interconnect
• Metro and Access Networks
• CATV and Broadcast Networks
• Specialized Communication Systems

These application areas are stated in the supplied UCWDM product information.

5. FAQ

What is an Ultra Compact WDM (UCWDM)?

UCWDM is a compact wavelength-division multiplexing module designed to combine or separate multiple optical wavelength channels within a reduced mechanical footprint.

The GracyFiber UCWDM series uses a free-space optical architecture and includes CWDM, LWDM, and DWDM configurations.

Which WDM types are available?

The supplied specification includes:

• CWDM
• LWDM
• DWDM

Each version has its own wavelength plan, passband, channel spacing, insertion-loss specification, and package dimensions.

What channel counts are available?

Depending on WDM type, the specification includes:

• 4CH
• 8CH
• 12CH
• 16CH
• 18CH

Not every channel count is available for every WDM type.

How small is the UCWDM module?

The smallest documented package is the 4CH CWDM version at 20 × 8 × 6.5 mm.

Other dimensions vary according to the WDM type and channel count.

6. Technical Specifications

General Specifications

Wavelength Configuration

CWDM

LWDM

DWDM

Channel Count & Insertion Loss

Package Dimensions

CWDM

LWDM

DWDM

7. Configuration & Customization Options

WDM Type

Available Options

• CWDM
• LWDM
• DWDM

Channel Count

CWDM

• 4CH
• 8CH
• 12CH
• 16CH
• 18CH

LWDM

• 4CH
• 8CH
• 12CH

DWDM

• 4CH
• 8CH
• 12CH
• 16CH

Wavelength Plan

CWDM

• 1270–1610 nm wavelength plan with 20 nm spacing

LWDM

• 1269.23–1318.35 nm documented wavelength set

DWDM

• ITU Grid C21–C60

Other wavelength plans: [Need confirmation]

Fiber Type

The source spreadsheet lists:

• G67A1
• A2
• B3
• SMF-28

Exact fiber nomenclature requires confirmation.

Fiber Protection

• 250 µm
• 900 µm loose tube

Fiber Length

• Standard documented length: 1000 mm
• Customized lengths: [Need confirmation]

Connector

• LC/UPC
• Customized connector

8. Detailed Product Description

The GracyFiber Ultra Compact WDM series is designed for optical systems where conventional WDM packaging occupies too much space. Its free-space optical architecture enables multiple wavelength-filtering functions to be integrated into a compact module while maintaining the optical characteristics required for wavelength multiplexing and demultiplexing.

The product family includes three wavelength architectures: CWDM, LWDM, and DWDM.

The CWDM version uses 20 nm channel spacing and supports channel counts up to 18CH. Its documented center wavelengths extend from 1270 nm through 1610 nm, with a ±6.5 nm passband.

The LWDM version uses a denser 4.5 nm wavelength spacing and provides specified center wavelengths between 1269.23 nm and 1318.35 nm. Configurations are available up to 12 channels.

For applications requiring denser channel allocation, the DWDM version supports ITU Grid C21–C60 with 0.8 nm spacing and configurations up to 16 channels.

Insertion-loss specifications vary according to both technology and channel count. For example, the 4CH CWDM and LWDM versions are specified at ≤1.2 dB, while the 4CH DWDM version is specified at ≤1.5 dB. Higher channel-count configurations have corresponding channel-dependent loss limits.

All three families share documented optical characteristics including ≥30 dB adjacent isolation, ≥40 dB non-adjacent isolation, ≤0.5 dB ripple, ≤0.5 dB PDL, ≥40 dB return loss, and ≥50 dB directivity.

The compact mechanical formats make the series particularly relevant to 5G fronthaul, DCI, metro/access networks, and other equipment where optical component footprint is constrained.

9. Application Scenario

Application 1 — 5G Fronthaul

5G fronthaul equipment often requires several optical wavelengths to be combined within equipment that has limited internal space.

The UCWDM series provides multi-channel wavelength multiplexing in compact packages, with options ranging from 4CH to 18CH depending on the WDM architecture.

Its small mechanical footprint is particularly relevant where multiple passive optical functions must be integrated into compact fronthaul equipment.

Application 2 — Data Center Optical Interconnect

The product documentation identifies data center interconnect as a target application.

Depending on the required wavelength architecture, CWDM, LWDM, or DWDM configurations can provide wavelength multiplexing within compact optical subsystems.

Application 3 — 100G to 800G Hybrid WDM Systems

The supplied product information specifically lists DWDM / Hybrid WDM for 100G to 800G as an application.

For these applications, the UCWDM family provides different wavelength spacings and channel-count options so the optical filtering architecture can be selected according to the system wavelength plan.

10. Why GracyFiber

GracyFiber provides passive wavelength-management and fiber-optic components for optical communication, data center, access-network, and photonics applications.

Relevant product capabilities include:

• Ultra Compact WDM
• CWDM
• DWDM
• LWDM
• MWDM
• FWDM
• WDM-PON
• AAWG
• PM WDM Components
• PLC / FBT Components
• Fiber Arrays and FAUs
• MPO/MTP Optical Interconnects

For this UCWDM family, the supplied specifications provide multiple wavelength architectures, channel counts, package dimensions, and fiber/connector configurations for compact optical integration.

11. Related Products

12. Call to Action

Need an ultra-compact WDM module for a space-constrained optical system?

Send GracyFiber your required:

• CWDM / LWDM / DWDM
• Channel count
• Center wavelengths
• Channel spacing
• Target insertion loss
• Isolation requirements
• Fiber type
• Fiber coating
• Fiber length
• Connector
• Maximum package dimensions
• Operating temperature requirement
• Application

GracyFiber can review the wavelength plan and mechanical requirements before quotation.