Semiconductor modulator with a .pi. shift

Optical waveguides – With optical coupler – Particular coupling structure

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385 3, 385 4, 359248, G02B 626

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active

056945043

ABSTRACT:
A MQW semiconductor Mach Zehnder phase modulator is formed by two Y-junctions (12, 32), each having a single waveguide (14) optically coupled with two branch waveguides (18, 20). The branch waveguides of the two Y-juntions are optically coupled in Mach-Zehnder configuration that, under zero bias conditions, has one interferometric arm longer than the other to provide a .pi. phase shift. The additional length is preferably accommodated in the branches of the Y-junctions. The phase shift, in combination with voltage dependent absorption properties and non-linear phase variations of the MQW guided regions in the Mach-Zehnder modulator results in a negative chirp and high extinction ratio for an equal, push-pull device configuration.

REFERENCES:
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patent: 5524076 (1996-06-01), Rolland et al.
patent: 5535045 (1996-07-01), Dutta et al.
C. Rolland et al., "10 Gb/s, 120 km Normal Fiber Transmission experiment using a 1.56 .mu.m Multiple Quantum Well InP/InGaAsP Mach-Zhnder Modulator", Conf. Optical Fiber Communication, San Jose, CA 1993, pp. 111-114 No Month.
T. Okiyama et al., "10 Gb/s Transmission in Large-Dispersion Feber Using a Ti:LiNbO.sub.3 Mach-Zehnder Modulator" Conf. Integrated Optics and Optical Fiber Communication, Kobe, Japan 1989, pp. 208-209 No Month.
A. H. Gnauck et al., "Dispersion Penalty Reduction Using an Optical Modulator with Adjustable Chirp", IEEE Photonics Technology Lettters, vol. 3, No. 10, Oct. 1991, pp. 916-918.
S.K. Korotky et al., "High-Speed, Low Power Optical Modulator with Adjustable Chirp Parameter", Integrated Photonics Research 1991, pp. 53-54 No Month.

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