Optical: systems and elements – Single channel simultaneously to or from plural channels – By partial reflection at beam splitting or combining surface
Patent
1995-04-25
1997-02-18
Callahan, Timothy P.
Optical: systems and elements
Single channel simultaneously to or from plural channels
By partial reflection at beam splitting or combining surface
359494, 359499, 359896, 250225, G02B 2714
Patent
active
056046367
ABSTRACT:
In a light receiving module of a first aspect of the invention, a transparent plate is provided therein in such a way as to be tilted so that polarized light dependency generated thereby is equal to that generated by tilting a light receiving element and moreover in a positional relationship of being perpendicular to the latter in tilting direction. As a result, even if incident light is varied in polarized state, polarized light dependencies generated by the transparent plate and the light receiving element cancel each other to restrain the polarized light dependency of the incident light as a whole. In a light receiving module according of a second aspect of the invention, the light-emitting end surface of an optical fiber is formed in the same positional relationship relative to the light receiving surface of the light receiving element as that of the transparent plate of the first aspect of the invention. As a result, it is possible to provide a light receiving module which is reduced in polarized light dependency generated by tilting the light receiving element to be less influenced by the variation of polarized state of incident light.
REFERENCES:
patent: 5414565 (1995-05-01), Sullivan et al.
patent: 5490013 (1996-02-01), Shimizu et al.
patent: 5491582 (1996-02-01), Fujita
Asami Keisuke
Itoh Akishige
Satoh Naoto
Ando Electric Co. Ltd.
Callahan Timothy P.
Le Dinh T.
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