Optical: systems and elements – Optical modulator – Light wave temporal modulation
Patent
1997-10-16
1999-11-30
Epps, Georgia
Optical: systems and elements
Optical modulator
Light wave temporal modulation
359254, 359276, G02F 1015
Patent
active
059952709
ABSTRACT:
A wideband semiconductor electro-absorption optical modulator including a semiconductor core shorter in absorption-peak wavelength than a wavelength of optical signal, and an electrode for applying an electric signal to absorb the optical signal by shifting the absorption-peak wavelength to a long wavelength region when a voltage is applied, wherein an electric signal input port and an electric signal output port are disposed so that the electrode is constructed in the form of a traveling-wave electrode, and a total thickness of non-doped layers including the semiconductor core is reduced to decrease a driving voltage. Degradation of optical modulation bandwidth and reflection characteristics of the electric signal caused by mismatching of characteristic impedance to an outer circuit are reduced by decreasing an interaction length of the electric signal and the optical signal. Further, mismatching of characteristic impedance is corrected by adjusting a doping concentration of a p-type or n-type doped layer located above or beneath the semiconductor core.
REFERENCES:
patent: 5067788 (1991-11-01), Jannson et al.
patent: 5422966 (1995-06-01), Gopalakrishnan et al.
patent: 5647029 (1997-07-01), Mihailidi et al.
patent: 5694504 (1997-12-01), Yu et al.
patent: 5742423 (1998-04-01), Ido et al.
patent: 5757985 (1998-05-01), Isgizaka
patent: 5771257 (1998-06-01), Takiguchi et al.
patent: 5778113 (1998-07-01), Yu
patent: 5784188 (1998-07-01), Nakamura et al.
Tatemi Ido, Shigehisa Tanaka, Makoto Suzuki, Mari Koizumi, Hirohisa Sano, and Hiroaki Inoue, Ultra-High-Speed Multiple-Quantum-Well Electro-Absorption Optical Modulars with Integrated Waveguides, Journal of Lightwave Technology, vol. 14, No. 9, Sep. 1996, pp. 2026-2034.
Isamu Kotaka, Osamu Mitomi, Koichi Wakita, Yuichi Kawamura, and Asai, High-Speed InGaAs/InAIAs Multiple-Quantum-Well Optical Modular, Electronics and Communication in Japan, Part II: Electronics, Jun. 1992, Part 2, vol./ 75, pp. 24-31.
Kawano K., Present and Future of Ultra-High Speed Optical Devices, (1306-1313) Journal of the Institute of Electronics, Information and Communication Engineers, vol. 76, No. 12, Dec. 1993.
Kawano K. et al., Proposal and Fabrication of a Traveling-Wave Electrode Electro Absorption(TW-EA) Modulator with Modulation Bandwidth of 50 Ghz, Abstract from the 58th Autumn Meeting of Japan Society of Applied Physics, No. 3, p. 1120, Oct. 1997.
Lin S.H., Wang S-Y, High-Throughput GaAs PIN Electrooptic Modulator With a 3-dB Bandwidth of 9.6 GHz at 1.3 .mu.m, Applied Optics, 1696-1700, vol. 26, No. 9, May 1987.
Kawano K. et al., Design of InGaAs-InA1As Multiple-Quantum-Well (MQW) Optical Modulators, 224-230, IEEE Journal of Quantum Electronics, vol. 28, No. 1, Jan. 1992.
Spickermann R. et al, GaAs/AIGaAs Travelling Wave Electro-Optic Modulator With an Electrical Bandwidth >40 GHz, 1095-1096, Electronics Letters, vol. 32, No. 12,Jun. 1996.
Agrawal N. et al., Integration of Guided Wave Devices for Very High Bitrates, 531-537, ECIO '97 8th European Conference on Integrated Optics, Apr. 1997.
Kawano K. et al, Polarisation-Insensitive Travelling-Wave Electrode Electroabsorption (TW-EA) Modulator With Bandwidth Over 50 GHz and Driving Voltage Less Than 2V, 1580-1581, Electronics Letters, vol. 33, No. 18, Aug. 1997.
Burke Margaret
Epps Georgia
Nippon Telegraph & Telephone Corporation
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