Arrangement for modulating the output signal of a converter,...

Details Arrangement for modulating the output signal of a converter,... Arrangement for modulating the output signal of a converter,...

H - Electricity

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325/1

H03C 3/36 (2006.01) H01S 3/13 (2006.01) H01S 5/0683 (2006.01) H04B 10/155 (2006.01) H04B 14/02 (2006.01)

Patent

CA 1186379

ABSTRACT: Arrangement for modulating the output signal of a converter converting electric signals into other signals, for example optical signals. An analog signal is applied to a difference producer the output signal of which con- trols a limiter. The binary output signal thereof con- trols the semiconductor laser diode which is coupled to a photo-sensitive detector for producing a feedback signal. After having been amplified in a broad-band amplifier and integrated in an integrator, this feedback signal is applied to the difference producer, in which the feedback signal is subtracted from the analog signal. Variations in the optical output signal due to a non-linear conversion characteristic of the laser diode and due to an optical retroaction of the fibre on the laser diode as well as out- put noise and signal-dependent amplitude variations are reduced by the negative feedback.

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