Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1994-03-21
1995-03-28
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
359187, H01J 516
Patent
active
054019575
ABSTRACT:
To perform waveform shaping, retiming and amplification of the transmitted pulse signal of a binary PCM fiber optic communication employing an optical pulse signal which has a pulse duty factor within 1 with respect to a time slot, an optical waveform shaping device is proposed in which the optical pulse signal is branched by an optical branch circuit into two optical signals. The one transmitted optical signal passes through a photodetector, a band-pass filter for extracting the fundamental frequency component of the signal, an amplifier and a delay circuit, so that the signal is converted to a sinusoidal voltage synchronized with the optical pulse signal. The other optical signal passes through a semiconductor electrical absorption type optical modulator which is driven by the sinusoidal voltage and a DC voltage, so that the width of a gate waveform is changed by controlling the amplitude of the sinusoidal voltage and the DC voltage.
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Edagawa Noboru
Matsushima Yuichi
Suzuki Masatoshi
Tanaka Hideaki
Yamamoto Shu
Kokusai Denshin Denwa Kabushiki Kaisha
Lobato Emmanuel J.
Nelms David C.
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