Optical waveguides – With optical coupler – Plural
Patent
1994-12-12
1997-05-27
Palmer, Phan T. H.
Optical waveguides
With optical coupler
Plural
385 14, 385 9, 385 41, 385 31, 359143, 359154, G02B 628
Patent
active
056339623
ABSTRACT:
The object is to reduce the size and losses of light transmitting/receiving modules. An optical transmitting/receiving module according to the invention comprises a light emitting element for sending out an optical signal of .lambda..sub.1 in wavelength, a first optical waveguide into which this transmit optical signal is entered, and a second optical waveguide for sending out the transmit optical signal and receiving an optical signal of .lambda..sub.2 in wavelength. Characteristically, it has a directional coupling section formed by arranging the first and second optical waveguides close to each other to be half as long as the full coupling length for a light having the wavelength of .lambda..sub.1, and at the end of the directional coupling section are arranged a filter for reflecting the transmit optical signal of .lambda..sub.1 in wavelength and transmitting the receive optical signal of .lambda..sub.2 in wavelength, and a light receiving element, arranged on the opposite side to the optical waveguide substrate via the filter, for receiving the receive optical signal.
REFERENCES:
patent: 5175778 (1992-12-01), Nourshargh et al.
patent: 5392377 (1995-02-01), Auracher
NEC Corporation
Palmer Phan T. H.
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