Arrangement for modulating the output signal of a converter, for example an electro-optical converter.

摘要

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 (6) the output signal of which controls a limiter (7). The binary output signal thereof controls the semiconductor laser diode (1) which is coupled to a photo-sensitive detector (3) for producing a feedback signal. After having been amplified in a broadband amplifier (9) and integrated in an integrator (13), this feedback signal is applied to the difference producer (6), in which the feedback signal is substracted from the analog signal. Variations in the optical output signal due to a non-linear conversion characteristic of the laser diode (1) and due to an optical retroaction of the fibre (2) on the laser diode (1) as well as output noise and signal-dependent amplitude variations are reduced by the negative feedback.

Use: Optical transmission systems.