Coherent light generators – Particular active media – Semiconductor
Patent
1994-06-08
1996-08-20
Bovernick, Rodney B.
Coherent light generators
Particular active media
Semiconductor
372 26, 372 96, 372102, H01S 318, H01S 310
Patent
active
055486070
ABSTRACT:
The disclosed integrated modulator/laser (I-MOD/DFB) combination comprises an active region that extends the full length of the combination without variation of layer thickness and/or composition. Because of this constancy of the active region parameters the relevant bandgap energy is the same in the laser portion of the combination as in the modulator portion thereof. The combination typically comprises a distributed feedback structure (e.g., a "grating"). In preferred embodiments the feedback structure is selected such that .lambda..sub.e >.lambda..sub.o (typically .lambda..sub.e -.lambda..sub.o in the range 20-70 nm), where .lambda..sub.e is the laser output wavelength, and .lambda..sub.o is the wavelength of the gain peak of the laser medium. The active region can be a bulk active region but preferably is a quantum well active region. Optionally an I-MOD/DFB combination according to the invention can comprise an absorbing region, e.g., an ion implanted region between the laser section and the modulator section. Combinations according to the invention typically are easier to manufacture than prior art combinations, and are advantageously used in e.g., optical fiber communication systems.
REFERENCES:
patent: 5252839 (1993-10-01), Gouguot
"Low Drive Voltage and Extremely Low Chirp Integrated Electroabsorption Modulator/DFB Laser for 2.5 Gibit/s 200 km Normal Fibre Transmission", by M. Aoki et al., Electronics Letters, vol. 29, No. 22, 28 Oct. 1993, pp. 1983-1984.
"2.5 ps Soliton Pulse Generation at 15 GHZ with monolithically Integrated MQW-DFB-LD/MQW-EA Modulator and Dispersion Decreasing Fibre", by K. Suzuki et al., Electronics Letters, vol. 29, No. 19, 16 Sep. 1993, pp. 1713-1714.
"Packaged, Integrated DBF/EA-MOD for Repeaterless Transmission of 10 Gbit/s Over 107 km Standard Fibre", by P. I. Kuindersma et al., Electronics Letters, vol. 29, No. 21, 14 Oct. 1993, pp. 1876-1878.
"A Multi-Section Electroabsorption Modulator Integrated DFB Laser for Optical Pulse Generation and Modulation", by K. Sato et al., Proceedings of the European Conference on Optical Communications, 1993, WeC7.2 (No Month Available).
"InGaAs/InGaAsP MQW Electroabsorption Modulator Integrated with a DFB Laser Fabricated by Bank-Gap Energy Control Selective Area MOCVD", by M. Aoki et al., IEEE Journal of Quantum Electronics, vol. 29, No. 6, Jun. 1993, pp. 2088-2096.
Bovernick Rodney B.
Lucent Technologies - Inc.
McNutt Robert
Pacher Eugen E.
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