Patent
1980-04-21
1982-12-07
Lee, John D.
350 9615, 350 9618, 350162R, G02B 5172
Patent
active
043623590
ABSTRACT:
A device for coupling a first optical signal of a first wavelength into a transmission glass-fiber and for coupling a second optical signal, which has a second wavelength which differs from the first wavelength, out of the fiber. The two signals travel in the transmission glass-fiber in opposite directions. The optical signals also travel in other, spatially separated glass fibers. The device includes an imaging device arranged between the transmission glass-fiber and the other glass fibers. In the pupil of the imaging device, a binary optical grating is disposed. Other glass fibers receive the second optical signals which have been diffracted into the diffractions orders of the grating.
The grating is a phase grating and is arranged on an optical axis of the imaging device. It has a duty factor of at least substantially 1:1 as well as an optical path difference, H=(n-1)h, which is substantially
REFERENCES:
patent: 4057326 (1977-11-01), Knop
patent: 4111524 (1978-09-01), Tomlinson
patent: 4198117 (1980-04-01), Kobayashi
patent: 4257673 (1981-03-01), Matthijsse
"Bidirectional Coupler for Full Duplex Transmission on a Single Optical Fiber," G. Bickel et al., SPIE vol. 139, Guided Wave Optical Systems and Devices (1978), pp. 63-69.
Dammann Hans
Killat Ulrich
Gonzalez Frank
Lee John D.
Schechter Marc D.
U.S. Philips Corporation
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