Optical signal processing devices

Details Optical signal processing devices Optical signal processing devices

1976-09-27

1979-03-06

Corbin, John K.

G02B 514

Patent

active

041427750

ABSTRACT:
Optical signal processing devices, primarily intended for use in integrated optical communication systems, include 3 dB coupled strip guide directional couplers. Each coupler is formed in a body of electrooptic material and includes electrodes bracketing at least one of the guides in the coupled region. Each coupler is fabricated so as to be overcoupled (i.e., greater than 3 dB coupling) when the coupling is synchronous. Voltage bias, supplied to the electrodes of each coupler, produces sufficient asynchronism to independently adjust each coupler to the desired 3 dB coupling condition. Permutation switches are produced by including a switchable phase shifter between two couplers. Channel drop filters are produced by including reflection gratings between two couplers. Differential phase detectors, for a pulse code modulation system, are produced by including a selected path length difference between the two strip guides connecting two couplers. A photolithographic technique for producing the required electrodes in precise registry with the strip guide couplers (typically characterized by 3 micrometer spacings) includes the use of the primary strip guide mask and a secondary mask to produce a photolithographic mask for defining the electrodes.

REFERENCES:
patent: 3909108 (1975-09-01), Taylor
patent: 4012113 (1977-03-01), Kogelnick et al.
Digest of Tech. Papers of the Topical Meeting on Integrated Optics, New Orleans (1974) WA-5 by Zernike.
Bell System Tech. Jour., No. 48 (1969) pp. 2071-2102, by Marcatili.
Journal of the Optical Society of America, No. 62 (1972) pp. 1346-1347 by Zernike et al.
Applied Physics Letters, vol. 27, No. 5 (1975) p. 289 by Papuchon et al.
Applied Physics Letters, vol. 27, No. 15 (1975) p. 555 by Kaminow et al.
18TH Annual Electronic Materials Conference, the Metallurgical Society of AIME (Salt Lake City, 1976) 22 by J. C. Shelton.

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