Optical: systems and elements – Optical modulator – Light wave temporal modulation
Patent
1994-09-01
1996-05-21
Hellner, Mark
Optical: systems and elements
Optical modulator
Light wave temporal modulation
359124, 359132, G02F 103
Patent
active
055195300
ABSTRACT:
There is provided a peak compression circuit including detection device for detecting that value of an input signal has exceeded a predetermined set value, a pulse generation device for generating, based on the result of the detection, a pulse signal constituted of frequency components which have no substantial adverse influence on the input signal and having a polarity in a direction of reducing the parts of the input signal exceeding the predetermined set value, a delay device for delaying the input signal so that there is a phase match between the generated pulse signal and the portions of the input signal exceeding the predetermined set value and an addition device for adding the delayed input signal and the pulse signal. There is further provided a light transmitter including the peak compression circuit and a light source for outputting a light signal which has been intensity-modulated by the output signal of the peak compression circuit. This configuration prevents or reduces clipping caused by the characteristics of a circuit or light source connected downstream of the peak compression circuit to suppress deterioration in distortion performance or digital errors.
REFERENCES:
patent: 5283679 (1994-02-01), Wedding
Dr.-Ing. Dieter Schwarzenau & Robert Bosch, "Clipping Effects in Analogue DFB-Transmitters for Fibre-Optic Cable TV Systems", 18th International Television Symposium and Technical Exhibition, Montreux, Switzerland, 10-15 Jun. '93, Publ. Date Oct. 5, 1993, pp. 322-331.
European Search Report.
IEEE Photonics Technology Letters, "Optical Modulation Depth Improvment in SCM Lightwave Systems Using a Dissymmetrization Scheme", vol. 6 No. 6, pp. 750-753, Jun. 1994.
"The Radio Amateur's Handbook", The American Radio Relay League, Inc. 1973.
Hellner Mark
Matsushita Electric - Industrial Co., Ltd.
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