Compensation device

Details Compensation device Compensation device

H - Electricity

04

B

H04B 10/18 (2006.01)

Patent

CA 2122208

- 12 - ABSTRACT - COMPENSATION DEVICE The compensation device is used in an optical network where signals are transmitted from a main station (M) to one or a plurality of user stations (US1 to US3). It compensates for analogue optical signal distortion caused by laser chirp of a laser in the main station (M) which generates said analogue optical signal and fiber dispersion of the fiber link over which the optical signal is transmitted. The device includes a distance measuring device (R) generating a result signal (MS) indicative of the distance between the main station and the user stations and which is possibly already available in the network to perform ranging when the latter network is also used to transmit digital signals from the user stations to the main station using Time Division Multiple Access. It also includes a processing circuit (PC) which in response to a given laser chirp and the result signal, provides a tuning signal (V) to tune the bias voltage of a varactor diode (VD) which is part of the compensation circuit inserted in the electrical signal path. In an optimal implementation the measuring device (R) and the processing circuit (PC) are located in the main station (M), whilst the varactor diode (VD) is located in each user station.

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