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CWDM 4CH/8CH/16CH Module

SENKO’s Coarse Wavelength Division Multiplexer Device (CWDM) is based on Thin-Film-Filter and Micro-Optics to achieve wide passband, low insertion loss, high channel isolation and excellent environmental stability.

  • High Isolation
  • RoHS Compliant
  • Low Insertion Loss
  • High Repeatability
PARAMETERS VALUE
Channel Spacing 20nm, ITU Grid
Channel number can be deceide when ordering
Passband Bandwidth (nm) @ -0.5dB ≥13
Insertion Loss (dB)¹³ @ Pass Band 4CH ≤2.0
8CH ≤3.5
16CH ≤6.0
Pass Band Ripple (dB) ≤0.5
Isolation (Demux) (dB) Adjacent Channel ≥30
Non-Adjacent Channel ≥40
Return Loss (dB) ≥45
Directivity (dB) ≥50
Polarization Mode Dispersion (dB) ≤0.2
Polarization Dependant Loss (dB) ≤0.2
Fiber Type SMF 28e 250µm fiber
Package Dimension (mm) 100(L) × 80(W) × 10(H)
120(L) × 80(W) × 18(H)
Operating Temperature (°C) 0~+70
Storage Temperature (°C) -40~+85

Notes:
1. The tested specifications do not include connectors.
2. For module with connectors, IL will be specified 0.3 dB higher and RL will be 5dB Lower.
3. 1310ch is also available to be packaged into the module.
4. Specifications may change without notice.

WDM Systems

Metro Networks

Local Area Networks (LAN)

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WDM is an acronym for Wavelength Division Multiplexer. The main purpose of the WDM is to increase bandwidth capabilities on a single optical fiber. Signals are sent using different wavelengths across one fiber channel until they are split into their respective lanes. The splitting is called demultiplexing. In reverse, the WDM can combine or multiplex the different wavelengths onto one fiber. This greatly increases the amount of information that can be sent over a single fiber.

CWDM is an acronym for Course Wavelength Division Multiplexer. CWDM is a type of WDM technology, however, the channel spacing is controlled to a recommended spacing called the ITU CWDM grid. In this grid, the channel spacing is 20nm with a channel passband of +/-6.5nm in the center wavelength. According to the ITU grid, the wavelength range is 1270nm to 1610nm where there are 18 individual channels separated by 20nm spacing.

DWDM is an acronym for Dense Wavelength Division Multiplexer. Similar to CWDM’s, a DWDM allows the multiplexing and demultiplexing of more than one wavelength that can be transmitted over one fiber. The difference here, is that the spacing is more dense. This means that the spacing is spaced at 0.8nm/0.4nm for DWDM’s. The wavelength used are from 1525nm to 1625nm which are known as the C Band and L Band wavelength ranges. DWDM’s allow for more channels due to the tight channel spacing.

A regular splitter has no wavelength dependency. This means that if 1310nm or 1550nm get sent into a splitter, both wavelengths are split into the ratio of the splitter. For a WDM, the device will actually block the light from with the wrong wavelength entering the channel and only pass the wavelength that it’s designed to allow through.