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Optical WDM Module

WDM Module | CWDM DWDM MUX DEMUX for Fiber Optic Networks

Introduction

Opelink is a premier manufacturer of WDM (Wavelength Division Multiplexing) modules, providing advanced optical multiplexing solutions for telecommunications, data centers, and enterprise networks. With 13+ years of expertise in optical passive components, we deliver ITU-T compliant products to customers in over 50 countries.

Wavelength Division Multiplexing technology enables multiple optical signals of different wavelengths to be transmitted simultaneously over a single fiber, dramatically increasing network capacity without deploying additional fiber infrastructure. Opelink offers a comprehensive range of WDM solutions including CWDM (Coarse WDM), DWDM (Dense WDM), AAWG (Athermal Arrayed Waveguide Grating), OADM (Optical Add-Drop Multiplexer), and FWDM (Filter WDM) modules.

Our WDM modules feature low insertion loss, high channel isolation, and excellent thermal stability, making them ideal for metro networks, long-haul transmission, data center interconnects, and 5G fronthaul applications. All products are manufactured in our ISO 9001:2015 certified facility and undergo rigorous testing to ensure reliable performance.

Product Types

Opelink offers five main categories of WDM modules:

1. CWDM MUX/DEMUX (Coarse Wavelength Division Multiplexing)

• 8, 16, or 18 channels
• 20nm channel spacing (1270-1610nm)
• Up to 80km transmission distance
• Passive, no power required
• Ideal for metro and access networks

2. DWDM MUX/DEMUX (Dense Wavelength Division Multiplexing)

• 40, 80, or 96 channels
• 100GHz or 50GHz channel spacing (C-band, L-band)
• Long-haul and ultra-long-haul capable
• Amplifier compatible (EDFA)
• For high-capacity backbone networks

3. AAWG (Athermal Arrayed Waveguide Grating)

• Temperature-independent operation (-40°C to +85°C)
• No electrical power or temperature control needed
• 40 or 48 channels
• Compact size, high reliability
• Ideal for outdoor and uncontrolled environments

4. OADM (Optical Add-Drop Multiplexer)

• Add or drop specific wavelengths at intermediate nodes
• 2, 4, or 8 channels
• Express port for through traffic
• Flexible network configuration
• For ring and mesh network topologies

5. FWDM (Filter WDM)

• 2 or 3 wavelength filtering
• 1310/1550nm, 1490/1550nm, or custom wavelengths
• Compact size
• High isolation (>40dB)
• For specific wavelength separation applications

Technical Specifications

Parameter	CWDM	DWDM	AAWG
Channel Count	8/16/18	40/80/96	40/48
Channel Spacing	20nm	100GHz/50GHz	100GHz
Wavelength Range	1270-1610nm	C-band/L-band	C-band
Insertion Loss	≤1.8dB	≤3.5dB	≤3.8dB
Isolation (Adjacent)	≥30dB	≥25dB	≥25dB
Isolation (Non-Adj)	≥40dB	≥40dB	≥40dB
PDL	≤0.2dB	≤0.3dB	≤0.3dB
Operating Temp	-40°C to +85°C	-5°C to +65°C	-40°C to +85°C

Applications

• Metro Networks: Cost-effective capacity expansion for urban fiber networks
• Long-Haul Transmission: High-capacity backbone and inter-city links
• Data Center Interconnect: High-bandwidth connections between DCs
• 5G Fronthaul: CPRI/eCPRI signal multiplexing for mobile networks
• Enterprise Networks: Campus and building fiber infrastructure
• CATV Networks: Video and data signal combining
• Fiber Optic Sensing: Multi-parameter sensor networks

FAQ

Q1: What is the difference between CWDM and DWDM?

A: CWDM (Coarse WDM) uses 20nm channel spacing with up to 18 channels across 1270-1610nm, suitable for distances up to 80km without amplification. DWDM (Dense WDM) uses 0.8nm (100GHz) or 0.4nm (50GHz) spacing with up to 96 channels in C-band and L-band, designed for long-haul applications requiring optical amplifiers.

Q2: Can CWDM and DWDM be combined in the same network?

A: Yes, hybrid CWDM/DWDM solutions are common. CWDM can be used for shorter reach, cost-sensitive applications, while DWDM handles high-capacity, long-distance requirements. Opelink offers hybrid mux/demux modules that combine both technologies.

Q3: What is the maximum transmission distance for WDM systems?

A: CWDM systems typically reach 40-80km without amplification. DWDM systems can span thousands of kilometers with EDFA amplifiers and dispersion compensation. Actual distance depends on fiber type, launch power, and number of channels.

Q4: Do WDM modules require power?

A: Standard CWDM, DWDM, and AAWG modules are completely passive and require no electrical power. However, some advanced DWDM systems may include monitoring ports or variable optical attenuators that require power.

Q5: Can you provide custom wavelength configurations?

A: Yes, Opelink offers custom channel plans, center wavelengths, and bandwidths. We can design WDM modules for specific applications including non-standard wavelength grids, wider channel spacing, or custom port configurations. Contact our sales team for custom requirements.