Email Us
+86 027-87887588
+86 18971538004

The Difference Between Cwdm And Dwdm Optical Transceiver

① Wavelength intervals

CWDM carrier channel spacing is wider, and each band is separated by 20nm. Therefore, only 8 to 16 wavelengths can be multiplexed on the same optical fiber. While the DWDM carrier channel spacing is relatively narrow, with 0.2nm, 0.4nm, 0.8nm, and 1.6nm intervals in each band, which can reuse 80 to 160 wavelengths.

②Wavelength ranges

The working wavelength range of CWDM is between 1270nm-1610nm, and of DWDM is selected from CWDM, which are 1525nm-1565nm (C band) 1570nm-1610nm (L band).

③Device costs

CWDM modulated laser uses uncooled laser, while DWDM uses cooled laser. The cooled laser uses temperature tuning, and uncooled laser uses electronic tuning. Due to the uneven temperature distribution in a wavelength range, temperature tuning is very difficult to achieve and the cost is high. Therefore, the cost of DWDM is much higher than CWDM.

④ Application

DWDM optical transceivers can complete the transmission of long-distance, large-capacity long-distance backbone networks. Some large-capacity metropolitan area network core nodes, telecom 5G, metropolitan area networks, backbone networks, and some data centers will also be applied to DWDM optical transceivers and devices. Compared with DWDM, the cost of CWDM will be much lower, mainly used in the access layer of the metropolitan area network, enterprise network, campus network etc. CWDM optical transceivers are widely used and save the cost of network upgrade.

⑤Wave division multiplexer/demultiplexer

CWDM optical transceivers must be used with CWDM wavelength division multiplexers and CWDM demultiplexers to achieve transmission, while DWDM optical transceivers must be used with DWDM wavelength division multiplexers and DWDM demultiplexers.

The Difference Between Cwdm And Dwdm Optical Transceiver

Gearlink Optical Transceiver
Get in touch with WHGearlink Optical Transceiver Experts to get professional support and helps within 24 hours.
Talk to Us
No.1120, Building 12, Changhang Lanjing International, Hongshan district, Wuhan city, Hubei province, China, 430000.
+86 027-87887588