External cavity laser

Details External cavity laser External cavity laser

2005-11-22

2005-11-22

Harvey, Minsun Oh (Department: 2828)

Coherent light generators

Particular resonant cavity

C372S102000, C372S042000, C372S043010

Reexamination Certificate

active

06967984

ABSTRACT:
External cavity laser with reflector in optical wave guide, particularly HDBR laser, with an active element comprising a semiconductor optical amplifying cavity having a low-reflectivity facet (3), for example a Semiconductor Optical Amplifier (SOA) with a facet (30) opposite to said low-reflectivity facet treated with a reflecting coating, or a Fabry-Perot laser, and an external reflector comprising a Bragg grating (70) formed in an optical wave guide (4) near a termination (5), facing said facet, of a segment (5, 6, 7) of said optical wave guide coupled with the facet. The grating has a spatial profile of modulation of the refraction index such that a corresponding optical reflectivity spectrum (A) has an optical bandwidth (W) sufficiently small around a prescribed laser oscillation mode wavelength (γc) for the laser to oscillate only on the prescribed mode and not on other oscillation modes even in conditions of high-frequency direct modulation.

REFERENCES:
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patent: 6310997 (2001-10-01), Kato et al.
patent: 0 949 729 (1999-10-01), None
patent: PCT/EP01/01877 (2001-07-01), None
Paoletti, R. et al. “1.56mm Optical Short Pulse Generation at 10-GHz Repetition Rate, Using a Mode-Locked Hybrid Distributed Bragg Reflector (ML-HDBR) Laser Source”, IEEE Photonics Technology Letters, IEEE Inc. New York , US. vol. 12, No. 3, Mar. 2000, pp. 245-247.
Giles, C.R. “Lightwave Applications of Fiber Bragg Gratings ”, Journal of Lightwave Technology, IEEE, New York, US. vol. 16, No. 8, Aug. 1, 1997, pp. 1391-1404.
Paoletti, R. et al. “15-GHz Modulation Bandwidth, Ultratow-Chip 1.56-mm Directly Modulated Hybrid Distributed Bragg Reflector (HDBR) Laser Source”, IEEE Photonics Technology Letters, IEEE Inc. New York, US. vol. 10, No. 12, Dec. 1998, pp. 1691-1693.

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