Optical branching filter

Details Optical branching filter Optical branching filter

G - Physics

02

B

88/97.4

G02B 6/34 (2006.01) G02B 6/32 (2006.01)

Patent

CA 1278714

ABSTRACT OF THE DISCLOSURE An optical branching filter branches or mixes light of n different wavelengths. A first input/output part for light consisting of the n wavelengths mixed together is provided at one of two surfaces of a transparent block. Various second input/output parts for forming optical filters each allowing only light having a respective predetermined one of the n wave- lengths to pass therethrough and reflecting light having other wavelengths, are provided at 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. The positions of each second input/ output port are selected so that the length of the optical paths formed between the lenses of the first input/output port and the second input/output port are in the reverse proportion to the lengths of wavelengths corresponding to the second input/ output portions.

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