Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1992-11-24
1995-07-25
Williams, Hezron E.
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359156, 359122, G02F 200, H04B 1500
Patent
active
054367514
ABSTRACT:
In an optical transmission system for transmitting a video signal by transmitting a laser light modulated with a video signal, through an optical fiber; and for receiving and photoelectrically converting the received laser light, a pilot signal is added to the video signal by a summing amplifier. A frequency of the pilot signal is smaller than a band width of the laser light, so that peak level of interference noise developed by multi-reflection at both ends of the optical fiber is decreased considerably. Moreover, in an optical transmission system for transmitting and receiving a video signal by modulating a laser light with the video signal through an optical fiber; and for receiving and photoelectrically converting the received laser light, a polarizing control element is provided in the optical fiber by coiling the optical fiber, so that a signal laser light transmitted without multi-reflection has different retardation from a signal laser light with multi-reflection, so that interference noise is reduced. Similarly, an optical fiber amplifier also employs the polarizing control element to reduce the adverse effect caused by the interference noise.
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patent: 5008958 (1991-04-01), Cimini, Jr. et al.
patent: 5166821 (1992-11-01), Huber
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patent: 5204923 (1993-04-01), Grasso et al.
patent: 5210808 (1993-05-01), Grasso et al.
Fujita Toshihiro
Ohya Jun
Matsushita Electric - Industrial Co., Ltd.
Moller Richard A.
Williams Hezron E.
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