Optical waveguides – Temporal optical modulation within an optical waveguide – Electro-optic
Patent
1998-04-09
1999-11-23
Ullah, Akm E.
Optical waveguides
Temporal optical modulation within an optical waveguide
Electro-optic
G02B 1035
Patent
active
059914718
ABSTRACT:
A Mach-Zehnder optical modulator is provided having first and second modulation electrodes on respective first and second interferometric arms for receiving modulating electric fields, and the two modulation electrodes are of different lengths, the ratio of the lengths being designed to control the relative bias of the two arms, thereby provide for adjustment and optimization of frequency chirp, in a positive or negative chirp MZ modulator or in a configurable chirp MZ modulator. The modulator may have an asymmetric input y-junction coupler and an asymmetric output y-junction coupler to provide unequal power splitting, and interferometric arms defining two optical paths, which may be of equal or unequal length so as to generate a fixed phase difference of 0, .pi. or .pi./2. Preferably, the device is operated with equal push-pull drive, although non-equal push pull drive may alternatively be used. The asymmetric modulation electrodes may be used in combination with an additional control electrode or pair of control electrodes, and with equal or non-equal power splitting. This structure is applicable to either semiconductor MZ modulators or lithium niobate MZ modulators, and provides additional flexibility to optmize frequency chirp.
REFERENCES:
patent: 5365338 (1994-11-01), Bramson
patent: 5550513 (1996-08-01), Wong
patent: 5694504 (1997-12-01), Yu
patent: 5778113 (1998-07-01), Yu
patent: 5859936 (1999-01-01), Ishikawa
Yu J et al: "Phase-engineered III-V MOW Mach-Zehnder modulators" IEEE Photonics Technology Letters, Aug. 1996, IEEE, USA. vol. 8. No. 8, pp. 1018-1020, XPOOO621639 ISSN 1041-1135 * pp. 1041 -1042, para. 2*.
de Wilton Angela C.
Nortel Networks Corporation
Ullah Akm E.
LandOfFree
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