CWDM Passive System with active CWDM SFP transceiver

CWDM passive system with the "point to point" topology is designed to organize the extraction and addition of optical signals at predetermined wavelengths from a communication line.

There are several construction options for such systems:

1. Setting up communication between the head-end station and terminal nodes that are interconnected with single/dual fibers.

The principal feature of this solution is to use of one "head"multiplexer (MUX) and several "terminal" add/drop multiplexers(OADM), which ensure the optical signal extraction at any path point.

2. Arranging a dual-sided system where two multiplexers (MUX) are connected with single/dual fibers.

In this system, both single-sided and dual-sided add/drop multiplexers (OADM) providing transmission of signals in either direction are used.

The maximum number of spurs is determined by the number of duplex transmission channels (2 to 18) and the optical line budget. OADM modulesused in these systems add optical signal attenuations, which lead to an overall reduction in the path length.

In the systems under consideration, 18 transmission channels and 18 extraction points can be arranged as a maximum.

Optical Path

CWDM systems can transport 18 wavelengths (1270~1610nm) with a channel spacing of 20nm. In custom application typically use 1470 to 1610nm in the spectrum grid. Compare with DWDM, CWDM has a wider channel spacing than DWDM.

System Capabilities:

Organization of up to 18 signal output points;

Support of all transmission protocols;

Transmission of any kind of traffic: data, voice, multimedia.

Transmission Medium Features:

Single/dual optical fibers;

Maximum route length of up to 90 km (depending on the number of output points and fiber-inserted attenuations);

Maximum value of fiber-inserted attenuations of about 30 dB (depending on the number of implemented channels).