Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1994-04-18
1996-03-19
Pascal, Leslie
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359153, 359188, H04B 1018
Patent
active
055007554
ABSTRACT:
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 analog 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), while the varactor diode (VD) is located in each user station.
REFERENCES:
patent: 5299044 (1994-03-01), Mosch
patent: 5302922 (1994-04-01), Heidemann et al.
patent: 5317441 (1994-05-01), Sidman
patent: 5327277 (1994-07-01), Van Der Plas et al.
patent: 5353285 (1994-10-01), Van Der Plas et al.
"Optical Equalization to Combat the Effects of Laser Chirp and Fiber Dispersion", L. Cimini, Jr. etal, IEEE Journal of Lightwave Technology, vol. 8, No. 5, May 1990, pp. 649-659.
"Electrical Predistortion to Compensate for Combined Effect of Laser Chirp and Fibre Dispersion", H. Gysel et al, Electronics Letters, vol. 27, No. 5, Feb. 28, 1991, pp. 421-423.
Berger Werner
Harnisch Stephen
Mestdeagh Denis J. G.
Sierens Christiaan H. J.
Steigenberger Ulrich
Alcatel Sel Aktiengesellschaft
Pascal Leslie
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