Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1996-06-25
1999-04-20
Pascal, Leslie
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359181, 359187, 359188, 359191, H04B 1004
Patent
active
058962166
ABSTRACT:
The AM/FM converter of the present invention comprises an optical frequency modulation section which receives multi-channel AM video signals and outputs an optical-frequency-modulated optical signal beam; and an optical heterodyne detection section comprising an optical frequency oscillator composed of a semiconductor local laser which outputs a local oscillator optical beam having an optical frequency separated by a designated intermediate frequency, an optical coupler, and a photoelectric converter composed of a photodiode, which receives the optical signal beam and outputs an electrical batched FM modulation signal which is frequency-modulated and frequency-converted to the intermediate frequency. By means of this configuration, the invention offers an AM/FM converter wherein the frequency band is made considerably wider.
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Ikeda Satoshi
Iwashita Katsushi
Kikushima Koji
Kishimoto Chisei
Kumozaki Kiyomi
Nippon Telegraph and Telephone Corporation
Pascal Leslie
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