Coherent light generators – Particular beam control device – Mode locking
Patent
1995-06-07
1996-08-13
Scott, Jr., Leon
Coherent light generators
Particular beam control device
Mode locking
372 6, 372 26, 372 94, 372703, H01S 3098
Patent
active
055464149
ABSTRACT:
A passively mode-locked fiber ring laser (LAS) is disclosed for generating optical pulses whose repetition frequency is settable. The mode-locked fiber ring laser (LAS) contains an erbium-doped fiber (ER), a ring resonator (RES), a pump-light source (PUMP), an optical modulator (MOD), and a feedback loop (RS). A portion of the signal light, which is produced by stimulated emission and is composed of a plurality of pulse repetition frequencies, is processed in the feedback loop (RS) into a drive signal which is coupled to the control input of the optical modulator (MOD). The feedback loop (RS) includes an adjustable filter which filters the desired pulse repetition frequency from the signal light. Thus, optical pulses of a given repetition frequency are developed in the ring resonator (RES) and at the output (OUT) of the passively mode-locked fiber ring laser (LAS).
REFERENCES:
patent: 4530603 (1985-07-01), Shaw et al.
patent: 5216681 (1993-06-01), St. Pierre et al.
patent: 5359612 (1994-10-01), Dennis et al.
patent: 5497386 (1996-03-01), Fontana
"40 GHz Pulse Generation Using a Widely Tunable All-Polarisation Preserving Erbium Fibre Ring Laser", T. Pfeiffer et al, Electronics Letters, Oct. 14, 1993, vol. 29, No. 21, pp. 1849-1850.
"Dual Wavelength Pulse Gneeration Using Mode-Locked Erbium-Doped Fibre Ring Laser", J. Schlager et al, Electronics Letters, Oct. 24, 1991, vol. 27, No. 22, pp. 2072-2073.
"High-Speed III-V Semiconductor Intensity Modulators", R. Walker, IEEE Journal of Quantum Electronics, vol. 27, No. 3, Mar. 1991, pp. 654-667.
Alcatel N. V.
Jr. Leon Scott
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