CWDM(Coarse Wavelength Division Multiplexer) is a low-cost WDM transmission technology for the metropolitan area network access layer. In principle, CWDM uses optical multiplexers to multiplex optical signals of different wavelengths onto a single fiber for transmission. At the receiving end of the link, the mixed signal in the fiber is decomposed into different wavelengths with the aid of an optical demultiplexer Signal to the appropriate receiving device.
Parameter | 4 Channel | 8 Channel | 16 Channel | ||||
| Mux | Demux | Mux | Demux | Mux | Demux | ||
Channel Wavelength(nm) | 1270~1610 | ||||||
Center wavelength Accuracy(nm) | ±0.5 | ||||||
Channel Spacing(nm) | 20 | ||||||
Channel Pass band(@-0.5dB bandwidth (nm) | >14 | ||||||
Insertion Loss(dB) | ≤1.4 | ≤2.6 | ≤5.0 | ||||
Channel Uniformity (dB) | ≤0.5 | ≤0.5 | ≤0.5 | ||||
Channel Ripple (dB) | 0.3 | ||||||
Isolation (dB) | Adjacent | N/A | >30 | N/A | >30 | N/A | >30 |
Non-adjacent | N/A | >40 | N/A | >40 | N/A | >40 | |
Insertion Loss Temperature Sensitivity (dB/℃) | <0.005 | ||||||
Wavelength Temperature Shifting (nm/℃) | <0.002 | ||||||
Polarization Dependent Loss (dB) | <0.1 | ||||||
Polarization Mode Dispersion (PS) | <0.1 | ||||||
Directivity (dB) | >50 | ||||||
Return Loss(dB) | >45 | ||||||
Maximum Power Handling(mW) | 500 | ||||||
Operating Temperature(℃) | -5~+75 | ||||||
Storage Temperature (℃) | -40~85 | ||||||
Package dimension(mm) | 1. L100 x W80 x H10 ( 2 CH~8CH Module) | ||||||
| 2. L120xW800xH18 (9 CH~18CH Module) | |||||||
Remark: Above is without connectors,if with connectors,add more 0.2dB.
Low insertion loss
High channel isolation
Can reach industrial grade
The short-haul transmission can be accomplished without any additional device in the CWDM system.
Order Information
Configuration | Channel No. | Channel | Pigtail Type | Fiber length | Dimensio(mm) | Connector |
M=Mux D=Demux | 04=4 Channel 08=8 Channel 16=16 Channel
N=N Channel …… | 27=1270nm 47=1470nm 49=1490nm …… 61=1610nm SS=special… | 0=250um 1=900um 2=2.0mm | 1=1m | 1=L100 x W80 xH10 2=L120xW80xH18 3=19 1U Rack | 0=None 5=other |
The difference between CWDM and DWDM:
1. CWDM has 18 bands, from 1270nm to 1610nm, and the interval between each band is 20nm. There are three types of channel spacing for DWDM as needed: 0.4nm (50Ghz), 0.8nm (100Ghz) and 1.6nm (200Ghz), 100GHz (from C17 to C61, which is the most commonly used, suitable for conventional equipment); C17 to H61, suitable for high-channel equipment).
2,.CWDM wavelength 1470nm ~ 1610nm generally use DFB lasers, because the channel spacing is large, so CWDM devices and lasers are cheaper than DWDM devices.
3.CWDM optical wave channel spacing is wide, the number of multiplexed optical wavelengths on the same fiber is less than DWDM, the reason for the "coarse" and "dense" titles;
4.CWDM optical modulation uses uncooled laser, which is tuned electronically; DWDM uses cooled laser, which is tuned with temperature.
5. Due to the uneven temperature distribution in a wide range of light wavelengths, temperature tuning is difficult and costly. CWDM avoids this difficulty, thus greatly reducing costs. At present, the cost of a CWDM system is generally only 30% of DWDM;
6.CWDM system power consumption and physical size are much smaller than DWDM system.
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