Title:
A TUNABLE LASER SOURCE WITH AN INTEGRATED WAVELENGTH MONITOR AND METHOD OF OPERATING SAME
Document Type and Number:
WIPO Patent Application WO2000052789
Kind Code:
A3
Abstract:
IPCavelength monitor is provided based on the transmission response of an optical filter (50). The monitor (52a, 52b) provides feedback to the laser (10) enabling it to lock to any given wavelength within its tuning range. The invention is also a process for integrating the wavelength monitor directly on chip with a variety of tunable semiconductor lasers. The invention also comprises a method for controlling the wavelength of a tunable laser by using a wavelength monitor to measure the output light and provide feedback to a control system (62). The laser and wavelength monitors are integrated together on a single indium phosphide chip. The wavelength monitor comprises a filter (50) with a wavelength dependent transmission function and a pair of detectors (52a, 52b). One detector (52a) is illuminated with light that has passed through the filter and the other provides a reference to measure the input intensity. Taking the ratio of the filtered light level to the unfiltered light provides a wavelength dependent signal. The filter (50) is designed such that the transmission function is monotonic and varies from a minimum at one extent of the laser's tuning range to a maximum at the other extent.
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Inventors:
COLDREN LARRY (US)
MASON THOMAS GORDON B (US)
FISH GREGORY (US)
MASON THOMAS GORDON B (US)
FISH GREGORY (US)
Application Number:
PCT/US2000/005235
Publication Date:
January 11, 2001
Filing Date:
February 29, 2000
Export Citation:
Assignee:
UNIV CALIFORNIA (US)
COLDREN LARRY (US)
MASON THOMAS GORDON B (US)
FISH GREGORY (US)
COLDREN LARRY (US)
MASON THOMAS GORDON B (US)
FISH GREGORY (US)
International Classes:
H01S3/00; H01S3/10; H01S5/026; H01S5/06; H01S5/0625; H01S5/0687; H01S5/12; H01S5/22; (IPC1-7): H01S3/10; H01S5/026
Domestic Patent References:
| WO1997005679A1 | 1997-02-13 | |||
| WO1999043060A1 | 1999-08-26 |
Foreign References:
| US4309671A | 1982-01-05 | |||
| EP0615321A2 | 1994-09-14 | |||
| EP0867989A1 | 1998-09-30 | |||
| EP0818859A1 | 1998-01-14 | |||
| US5323409A | 1994-06-21 | |||
| EP0939470A2 | 1999-09-01 |
Other References:
MASON B ET AL: "TUNABLE SAMPLED-GRATING DBR LASERS WITH INTEGRATED WAVELENGTH MONITORS", IEEE PHOTONICS TECHNOLOGY LETTERS,US,IEEE INC. NEW YORK, vol. 10, no. 8, 1 August 1998 (1998-08-01), pages 1085 - 1087, XP000769864, ISSN: 1041-1135
PATENT ABSTRACTS OF JAPAN vol. 1996, no. 03 29 March 1996 (1996-03-29)
PATENT ABSTRACTS OF JAPAN vol. 1996, no. 03 29 March 1996 (1996-03-29)
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