Waveguide-type coupler/splitter

Details Waveguide-type coupler/splitter Waveguide-type coupler/splitter

1991-12-24

1993-01-12

Healy, Brian

Optical waveguides

With optical coupler

Plural

385 21, 385 31, G02B 628

Patent

active

051796040

ABSTRACT:
A 2-input/2-output directional coupler is arranged as an element coupler/splitter for a first stage, and 1-input/2-output coupler/splitters are used as element coupler/splitters for a second stage and subsequent stages. Output ports of these element coupler/splitters are concatenated with input ports of other element coupler/splitters to form a 2-input/multi-output coupler/splitter. An optical signal can be inputted through one input port of the first-stage 2-input/2-output directional coupler, and an optical signal for optical line monitoring can be inputted through the other input port. It is unnecessary, therefore, to use an optical wavelength division multiplexer/demultiplexer or other optical part which conventionally is connected at the time of optical line monitoring.

REFERENCES:
patent: 4953935 (1990-09-01), Suchoski, Jr. et al.
patent: 5000530 (1991-03-01), Takahashi
patent: 5074634 (1991-12-01), Takahashi
Patent Abstracts of Japan, vol. 11, No. 197, Jun. 25, 1987, Fiber Type Optical Frequency Demultiplexer and Multiplexer.
Optics Letters, vol. 12, No. 7, Jul. 1987, pp. 534-535, Wavelength-Insensitive Couplers Using Dispersive Materials.
Electronics Letters, vol. 23, No. 18, Aug. 1987, pp. 948-949, High-Performance Guided-Wave Multi/Demultiplexer Based on Novel Design using Embedded Gradient-Index Waveguides in Glass.
"Silica Waveguide Integrated Circuit Technology" by T. Miyashita et al; Tech Dig. 7th International Conf. on Integrated Optics and Fiber Communication, 18D1-1, Kobe, pp. 52-53.

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