Coherent light generators – Optical fiber laser
Patent
1997-08-28
1999-07-20
Davie, James W.
Coherent light generators
Optical fiber laser
372 18, 372 26, 372 25, H01S 307, H01S 3098, H01S 310
Patent
active
059264926
ABSTRACT:
A harmonically and regeneratively mode-locked laser pulse oscillator having a clock extraction circuit for picking up from a fragment of a laser output a clock signal corresponding to a high-order integer multiple of the fundamental frequency determined by the cavity length of the laser, a phase shifter and an electric amplifier for driving an optical modulator disposed in the laser cavity at the frequency of the clock signal. The laser pulse oscillator has a phase-locked loop including a phase comparator for detecting the phase difference between the clock signal and an external signal fed from a synthesizer with its frequency fixed, a fiber stretcher for controlling the cavity length such that the repetition rate frequency of the laser pulse oscillator is locked to the external signal, and an electric filter and electric amplifier for expanding and contracting the fiber length by feeding back the phase difference detected by the phase comparator to the fiber stretcher. This makes it possible to lock the repetition rate frequency of the optical pulse train to the external signal, and to generate the stabilized, fixed frequency optical pulse train with a high repetition rate over a long time period.
REFERENCES:
patent: 5583959 (1996-12-01), Nakazawa et al.
Extended Abstracts (The 43rd Spring Meeting 1996); The Japan Society of Applied Physics and Related Societies--No. 3; 26a-A-7; NTT Access Network Systems Labs. M. Nakazawa et al.; Mar. 26, 1996.
Ultrahigh Speed Optical Pulse Generator; Feature & Configuration (No date).
A Repetition-Rate Stabilized and Tunable, Regeneratively Mode-Locked Fiber Laser Using an Offset-Locking, Technique; Nakazawa et al., Jpn. J. Appl. Phys. vol. 35 (1996); Part 2, No. 6A, Jun. 1, 1996; pp. L691-694.
Nakazawa Masataka
Yoshida Eiji
Davie James W.
Frank Robert J.
Nippon Telegraph & Telephone Corporation
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