Optical: systems and elements – Optical modulator – Light wave temporal modulation
Patent
1995-03-03
1996-08-13
Ben, Loha
Optical: systems and elements
Optical modulator
Light wave temporal modulation
359256, 359263, 359484, 359495, G02F 109
Patent
active
055462197
ABSTRACT:
In the forward direction, the light from an input fiber is polarized and separated in a polarized light separating and combining element, the separated polarized light is rotated by a polarized light rotating element, dispersed according to wavelength by a wavelength dispersing element, rotated again by the polarized light rotating element, and is further rotated by a phase plate, thereby combining the polarized lights in the polarized light separating and combining element, so that only the light of a desired wavelength is coupled with the optical fiber. In the reverse direction, the light from the output fiber is not coupled with the input fiber, and hence the light propagation direction is defined in one direction in the disclosed optical circuit. A light transmission system and method using this optical circuit is also presented.
REFERENCES:
patent: 4548478 (1985-10-01), Shirasaki
patent: 5204771 (1993-04-01), Koga
patent: 5237445 (1993-08-01), Kuzuta
patent: 5272433 (1993-12-01), Simonelli
patent: 5315431 (1994-05-01), Masuda et al.
patent: 5408354 (1995-04-01), Hosokawa
Ben Loha
Matsushita Electric - Industrial Co., Ltd.
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