POINT TO POINT OPTICAL LINK

摘要

A point to point optical link from a transmitter (1) to, a receiver (2) via an optical fiber (3), the transmitter (1) comprising light sources (4) providing signals of different wavelengths and a multiplexer (6) combining the signals onto a single channel for transmission along the optical fiber (3), and the receiver (2) comprising light sensors (8) and a demultiplexer (10) for separating the signals of different wavelengths and directing each to a respective light sensor (8). The output of the transmitter (1) is temperature dependent but arranged so that the change in wavelength with respect to temperature for each of the signals is similar, and the demultiplexer (10) being adjustable so that its response to signals with respect to their wavelength can be actively tuned so as to follow variations in the wavelength of the signals received.