Optical waveguides – Temporal optical modulation within an optical waveguide – Electro-optic
Patent
1996-11-07
1998-07-07
Ngo, John
Optical waveguides
Temporal optical modulation within an optical waveguide
Electro-optic
385 8, 385 9, G02B 610
Patent
active
057781133
ABSTRACT:
A multi-quantum-well Mach-Zehnder optical phase modulator selectively generates positive and negative frequency chirp. The modulator has an asymmetric input y-junction coupler and an asymmetric output y-junction coupler joined by interferometric arms defining two optical paths of unequal length so as to generate a fixed phase difference of .pi. or an integral odd multiple thereof. The modulator has electrodes on each arm for receiving modulating electric fields in a push-pull relationship. A control electrode is provided on one of the arms for receiving a control electric field. The modulator, when driven without any control electric field generates negative frequency chirp, and selectively generates positive frequency chirp in response to adjustment of the control electric field. As an alternative, the length differential between respective arms can be selected to generate a phase difference of .pi./2, in which case control electrodes are required on each of the interferometric arms. A method of selectively generating a modulated optical signal having selectively configurable frequency chirp is also described.
REFERENCES:
"10Gb/s, 120 km Normal Fiber Transmission Experiment using a 1.56 um Multiple Quantum Well InP/InGaAsP Mach-Zehnder Modulator", Rolland et al, Conf. Optical Fiber Communication, San Jose, California, 1993, pp. 111-114.
"High-Speed, Low Power Optical Modulator with Adjustable Chirp Parameter", Korotky et al, Topical Meeting of Integrated Photonics Research, Moneterey, California, 1991, pp. 53-54.
"Dispersion Penalty Reduction Using an Optical Modulator with Adjustable Chirp", Gnauck et al, IEEE Photonics Technology Letters, vol. 3, No. 10, Oct. 1991, pp. 916-918.
"10Gb/s, 120 km Normal Fiber Transmission Experiment using a 1.56 um Multiple Quantum Well InP/InGaAsP Mach-Zehnder", Rolland et al, Conf. Optical Fiber Communication, San Jose, California, 1993, pp. 1111-1143
MacGregor George
Ngo John
Northern Telecom Limited
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