What is the operating wavelength in CWDM?

copy link DWDM wavelengths are typically from 1525 nm to 1565 nm (C-band), with some systems also capable of utilizing wavelengths from 1570 nm to 1610 nm (L-band).

How many channels or wavelengths are commonly used in CWDM systems?

CWDM supports up to 18 wavelength channels transmitted through a fiber at the same time. To achieve this, the different wavelengths of each channel are 20nm apart. DWDM, supports up to 80 simultaneous wavelength channels, with each of the channels only 0.8nm apart.

What is the maximum distance covered by CWDM?

CWDM is a convenient and low-cost solution for distances up to 70km. But between 40km and its maximum distance of 70km CWDM tends to be limited to 8 channels due to a phenomena called the water peak of the fiber (more about this further down).

What does CWDM mean?

Coarse wavelength division multiplexing
Coarse wavelength division multiplexing (CWDM) is a wavelength division multiplexing (WDM) technology that combines multiple signals at various wavelengths for simultaneous transmission over fiber cables.

What is CWDM mux?

CWDM MUX/DEMUX (Coarse Wavelength Division Multiplexer/Demultiplexer) is a flexible, low-cost solution that enables the expansion of existing fiber capacity. The wavelengths used in CWDM implementations are defined by the ITU-T G. 694.2, listing 18 wavelengths from 1270nm to 1610nm with a channel spacing of 20 nm.

What is the applications of CWDM systems?

CWDM is being used in cable television networks, where different wavelengths are used for the downstream and upstream signals. In these systems, the wavelengths used are often widely separated. For example, the downstream signal might be at 1310 nm while the upstream signal is at 1550 nm.

What is maximum channel capacity of DWDM channel?

433 Gbps
Rmax =Bolog2(OSNR+1) For a 62 GHz channel passband (for standard 200 GHz DWDM channel spacing) and an OSNR of 126 (21 dB) the maximum possible channel capacity is 433 Gbps.

How does a CWDM work?

It works by combining optical signals of different wavelengths on one strand of fiber. Usually, CWDM is able to transport up to 18 wavelengths with a channel spacing of 20 nm in the spectrum grid from 1270 nm to 1610 nm.