Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1992-08-25
1994-11-01
Olms, Douglas W.
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359169, 359170, 359173, 385 9, 385 41, 385 44, 385 45, 385 46, 385 47, 385 39, G02B 612
Patent
active
053611578
ABSTRACT:
A bidirectional light transmission system comprises a transmitting station having a light source for intensity-modulating a transmission signal, a first light branching portion for branching intensity-modulated light of the light source in a predetermined ratio and a first light receiving portion, and a receiving station having a second light branching portion, a light phase-modulating portion, a light reflecting portion and a second light receiving portion. The transmitting station transmits the intensity-modulated light via a single optical fiber transmission line to the receiving station connected thereto and receives a returned signal returned from the receiving station via the single optical fiber transmission line in the first light receiving portion, and the receiving station branches the transmitted light into first branched light and second branched light in the second light branching portion, phase-modulates at least one of the first branched light and second branched light in the light phase-modulating portion, transmits part of the first branched light and second branched light to the second light receiving portion via the light reflecting portion and simultaneously intensity-modulates reflected part of the first branched light and second branched light as a returned signal in the light phase-modulating portion and the second light branching portion, and returns the returned signal to the transmitting station via the single optical fiber transmission line.
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Fujisawa Shuichi
Ishikawa Tadasu
Maeda Mikio
Oyamada Kimiyuki
Takizawa Kunihara
Nippon Hoso Kyokai
Olms Douglas W.
Vu Huy D.
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