With a ceaseless commitment to innovation, GEZHI Photonics continues to disrupt the landscape of modern communication systems. The company's latest offering - the Coarse Wavelength Division Multiplexer (CWDM), based on Thin Film Filter (TFF) technology, has been lauded for its flexibility, variety of package sizes, and wavelength options.

CWDM technology introduces a new dimension of flexibility in enhancing the capacity of existing fiber infrastructure. It facilitates the operation of multiple channels/wavelengths over the same fiber cabling. The ability of each channel to transmit data independently allows network designers to carry different data rates. This makes CWDM a versatile tool for diverse data transmission requirements.
GEZHI’s CWDM comes packed with a host of features that deliver high-performance levels. Some of these features include:
Low Insertion Loss: Ensures the signal undergoes minimal loss when it passes through the CWDM.
Low Crosstalk: Guarantees optimal signal quality by reducing interference between different channels.
High Stability and Reliability: Provides consistent and reliable performance over time, regardless of external conditions.
Epoxy-free Optical Path: Eliminates the risk of signal degradation that can occur due to the epoxy application.
These features make GEZHI’s CWDM an indispensable part of any modern WDM network, telecommunication system, or access network. It also has essential applications in line monitoring operations.
The technical parameters of GEZHI's CWDM products show the company's commitment to deliver top-tier performance. Here's a comparative view of the performance metrics of the 1x2, 1x4, 1x8, and 1x18 configurations:
| Parameter | 1x2 | 1x4 | 1x8 | 1x18 |
|---|---|---|---|---|
| Center Wavelength (nm) | ITU, ITU+1 | ITU, ITU+1 | ITU, ITU+1 | ITU, ITU+1 |
| Passband (nm) | ITU±6.5 | ITU±6.5 | ITU±6.5 | ITU±6.5 |
| Operating Wavelength (nm) | 1260~1620 | 1260~1620 | 1260~1620 | 1260~1620 |
| Channel Space (nm) | 20 | 20 | 20 | 20 |
| Fiber Type | SMF-28e or customer specified | SMF-28e or customer specified | SMF-28e or customer specified | SMF-28e or customer specified |
Note: Customized specifications are available. The insertion loss values are specified without a connector. If a connector is included, IL will increase by 0.2dB.

Understanding the dynamic needs of modern data transmission networks, GEZHI has designed the CWDM with various packages to fit into different system designs and applications. From ABS box packaging to LGX and 19” Rack mount packaging, the CWDM can be integrated into various system formats.
With the growth in data consumption across different verticals, the demand for efficient and reliable data transmission systems has skyrocketed. GEZHI’s CWDM is a potent tool to meet these rising demands. It offers the capability to transport 18 wavelengths (1270~1610nm) with a channel spacing of 20nm. Unlike DWDM, CWDM has a wider channel spacing, which makes it a versatile solution for varying network requirements.
GEZHI's CWDM is more than just a data transmission tool; it's an enabler for smarter and more efficient networking. Here are some practical applications of CWDM.
Ensuring the smooth and uninterrupted flow of data across your network is crucial. With the CWDM's low insertion loss and high stability & reliability, network administrators can easily monitor and manage data lines for optimal performance.
For Wide Division Multiplexing (WDM) networks, GEZHI's CWDM provides an efficient way to increase the network's capacity without substantial infrastructure changes. Multiple channels over the same fiber cabling allow for independent data rates transportation, ensuring that your WDM network remains robust and flexible.
Telecommunication networks demand high reliability and consistent performance. CWDM’s low crosstalk, high stability & reliability, and epoxy-free optical path make it a perfect choice for telecommunication networks aiming for superior performance.
As the demand for higher bandwidths and faster internet speeds continue to rise, access networks need solutions that can cope with these demands. GEZHI’s CWDM, with its ability to support multiple channels over the same fiber cabling, can help meet these demands efficiently.
Ready to upgrade your network? GEZHI's CWDM is available for order. Simply provide the number of channels, configuration, module type, cable type, fiber length, and connector type, and we'll deliver a CWDM that's tailored to your needs.
Let's take a closer look at the performance of GEZHI's CWDM and understand how it can be a game-changer in your network.
| Parameter | 1x2 | 1x4 | 1x8 | 1x18 |
|---|---|---|---|---|
| Mux | Center Wavelength (ITU, ITU+1) | Passband (ITU±6.5) | Operating Wavelength (1260~1620) | Channel Space (20) |
| Demux | Center Wavelength (ITU, ITU+1) | Passband (ITU±6.5) | Operating Wavelength (1260~1620) | Channel Space (20) |
| Isolation(dB) | Adjacent Channel (30) | Non-Adjacent Channel (45) | Ripple (0.3) | PDL (0.2) |
| Other Specifications | PMD (0.1) | Return Loss (45 dB) | Directivity (50 dB) | Maximum Optical Power (500 mw) |
| Operating Temperature | -5~+85 ℃ | |||
| Storage Temperature | -40~85 ℃ | |||
Note: The specifications above are without connectors. If connectors are included, IL will increase by 0.2dB.
Understanding the science behind CWDM can help you make better use of this powerful tool. CWDM systems can transport 18 wavelengths (1270~1610nm) with a channel spacing of 20nm. In custom applications, it typically uses 1470 to 1610nm in the spectrum grid. CWDM has a wider channel spacing than DWDM, which allows it to provide higher capacity without increasing infrastructure costs or complexity.
Choose the CWDM configuration that's right for you. To place an order, specify the number of channels, the configuration, the module type, the cable type, the fiber length, and the connector type. Our team is here to help if you have any questions or need assistance with your order.
GEZHI's CWDM is available in different packaging options to suit various customer needs. The packages vary in size, from small ABS boxes to 19" rackmount packages.
GEZHI's CWDM can come in an ABS box, a type of heat-resistant and hard plastic box. This package is compact and sturdy, making it easy to store and transport.
If you're looking for something larger, GEZHI also offers rackmount packages. These are larger than the ABS packages and are intended for installation in a rack. The rackmount package makes it easy to organize and manage the CWDM in data centers or larger network installations.
At GEZHI, we understand that every network is unique. That’s why we offer the opportunity to customize your CWDM to your specific needs. From the number of channels to the module type, cable type, fiber length, and connector type, every detail can be customized to fit perfectly into your network architecture. See the table below for options:
| Ordering Information | Options |
|---|---|
| Number of Channels | 1, 2, 3, 4, ..., 16, 17, 18 |
| Configuration | M=Mux, D=Demux, A=Mux+Demux |
| Module type | Various options including ABS box (80x60x12mm, 100x80x10mm, 120x80x18mm, 140x115x15mm), LGX (129*29*130mm), LGX insert in 2slot Rack, LGX insert in 4slot Rack, 19" 1 U Rack, 2slot 19″1U Rack, 4slot 19″1U Rack. You can also specify your preferred module type. |
| Cable type | Options include 900um loose tube, 2.0mm, 3.0mm. |
| Fiber length | Options include 0.5m, 1.0m, 1.5m. You can also specify the desired length. |
| Connector | Options include LC/UPC, LC/APC, SC/UPC, SC/APC, FC/UPC, FC/APC. You can also specify your preferred connector. |
To order, simply pick the options that best suit your needs. If you're unsure about which options to choose, our team is here to help. Just let us know what your network looks like, and we'll provide expert advice.