1987-02-06
1989-04-25
Sikes, William L.
G02B 628
Patent
active
048242004
ABSTRACT:
An optical branching filter branches or mixes lights of n-kind of wavelengths. An input/output port for the light mixed n-kind of wavelengths is provided to one of two surfaces of the transparent block and second input/output parts for forming optical filters allowing only the lights having the predetermined wavelengths to pass therethrough, respectively among the lights in n-kind of wavelengths, but reflecting the lights having other wavelengths, respectively is provided to any one of two surfaces. A first input/output port and n second input/output ports, respectively is formed by an optical waveguide and a lens which optically connects the optical waveguide and first input/output part or a second input/output part. Positions of each second input/output port are selected so that the length of optical paths formed between the lenses of the first input/output port in the second input/output port are in the reverse proportion to the lengths of wavelengths corresponding to the second input/output portions.
REFERENCES:
patent: 4274706 (1981-06-01), Tangonan
patent: 4482994 (1984-11-01), Ishikawa
patent: 4701012 (1987-10-01), Kaiser
patent: 4705349 (1987-11-01), Reedy
European Search Report, Jun. 1, 1987; The Hague by Examiner Pfahler, R.
"Four-Channel Optical Branching Filter", Fujitsu Scientific and Technical Journal, vol. 21, No. 5, (Dec. 25, 1985), pp. 511-526.
Asanuma Kazushi
Isono Hideki
Terai Kiyoshi
Yokota Takashi
Fujitsu Limited
Sikes William L.
Ullah Akm E.
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