Modulators – Amplitude modulator – Including discrete semiconductor device
Patent
1993-08-16
1995-03-14
Pascal, Robert J.
Modulators
Amplitude modulator
Including discrete semiconductor device
332152, 359180, 359181, 372 8, 372 26, 372 29, 372 31, 372 38, H03C 154, H01S 313
Patent
active
053980085
ABSTRACT:
The universally-applicable circuit arrangement of the invention makes possible an adjustment procedure for holding emitted optical power of a laser constant independent of temperature and aging. This circuit arrangement may be carried out as a three-stage cascade circuit supplied with operating voltages greater than 5 V. In accordance with the purpose of the invention, a circuit arrangement is provided which is universally applicable in a temperature range T=-40.degree. C. to 100.degree. C. for commercially available lasers and can be supplied by a standard 5 V source. In order to accomplish this as per the invention, differential amplifiers acting as current switches are arranged in a first cascade stage and the current sources feeding the differential amplifiers arranged in a second cascade stage. A data signal (D) serving to control the modulating current (I.sub.mod) is logically combined with a pilot signal (P) serving to control the pilot currents (I.sub.P1, I.sub.P2) in at least one cascade stage.
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"Laser Level Control for High Bit Rate Optical Fibre Systems" by D. W. Smith and T. G. Hodgkinson, 1980 IEEE, pp. 926-930.
Kaiser Norbert
Manz Werner
Nissler Dieter
ALCATEL N.V.
Kinkead Arnold
Pascal Robert J.
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