Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1997-08-15
2000-02-22
Negash, Kinfe-Michael
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359160, 359134, 372 26, H04B 1000
Patent
active
060286873
DESCRIPTION:
BRIEF SUMMARY
Modulated optical input signal clocked by this clock on an optical input carrier wavelength are disclosed, for example, in D. M. Patrick, R. J. Manning: 20 Gbit/s all-optical clock recovering using semiconductor nonlinearity, Electr. Lett. Vol. 30 (1994), pages 151 to 152; A. D. Ellis, K. Smith, D. M. Patrick: Alloptical clock recovery at bit rates up to 40 Gbit/s, Electr. Lett. Vol. 29 (1993), pages 1323 to 1324 or P. E. Barnsley, E. J. Wickes, E. G. Wickens, D. M. Spirit: All-optical clock recovery from 5 Gb/s RZ Data using a self-pulsating 1.56 .mu.m Laser diode, IEEE Phot. Tech. Lett., Vol. 3 (1991) pages 942 to 945, the clock being recovered in these arrangements by mode locking of a laser to the modulated input signal. A nonlinear optical element is always required for the purpose of mode locking in an optical resonator. Use is made, as nonlinear optical elements, of optical amplifiers (see Electr. Lett. Vol. 30 (1994), pages 151 to 152), optical fibers (see Electr. Lett. Vol. 29 (1993), pages 1323 to 1324), saturable absorbers (see IEEE Phot. Tech. Lett., Vol. 3 (1991), pages 942 to 945) and sections of multisection DFB lasers (see U. Feiste, D. J. As, A. Erhardt: 18 GHz all-optical frequency locking and clock recovery using a self-pulsating two-section DFB laser, IEEE Phot. Tech. Lett. Vol. 6 (1994), pages 106 to 108 or R. J. Manning, D. A. O. Davies, D. Cotter, J. K. Lucek: Enhanced recovery rates in semiconductor laser amplifiers using optical pumping, Electr. Lett. Vol. 30 (1994), pages 787 to 788).
The data rate of saturable absorbers has so far been limited to approximately 5 Gb/s (see IEEE Phot. Tech. Lett., Vol. 3 (1991), pages 942 to 945).
Data rates of 40 Gb/s have already been achieved using optical fibers. However, with fiber lengths of approximately 10 km, they are difficult to integrate.
20 Gb/s (see Electr. Lett. Vol. 30 (1994), pages 151 to 152) have been achieved using optical amplifiers in the resonator, and a figure of 18 GHz (see IEEE Phot. Tech. Lett. Vol. 6 (1994), pages 106 to 108) has been achieved using multisection DFB lasers.
An advantage of an arrangement having an optical amplifier in the resonator as compared with multisection DFB lasers is that the nonlinear element is more effectively separated from the residual resonator with its amplifying medium, and can therefore be specifically influenced. Thus, a proposal has already been made as to how the clock can be brought up to 100 Gb/s using an optical amplifier in the resonator, specifically by intensive pumping of the nonlinearly operating optical amplifier using a continuously operating laser (see Electr. Lett. Vol. 30 (1994), pages 787 to 788).
SUMMARY OF THE INVENTION
The invention, whose generic concept specified in the preamble is disclosed in Electr. Lett. Vol. 30 (1994), pages 151 to 152, or else Electr. Lett. Vol. 30 (1994), pages 787 to 788, has the advantage that the laser arrangement can be integrated in a module and that it is rendered possible to recover the clock from the modulated input signal in optical networks with high data rates of 10 Gb/s and more.
The arrangement according to the invention, which can be designated as an optical clock, corresponds to a mode-locked laser which has an optical resonator with a wavelength-selective optical transmission channel section and at least one optical amplifier at each end of this channel section, the position of the wavelength-selective optical transmission channel section in the resonator being essential to the invention.
The optical transmission channel section can advantageously be realized by a bidirectional optical wavelength demultiplexer which acts as a demultiplexer when operated in one direction and acts as a multiplexer when operated in the opposite direction.
The arrangement according to the invention can advantageously be used to regenerate the optical input signal in an optical repeater.
BRIEF DESCRIPTION OF THE DRAWINGS
The features of the present invention which are believed to be novel, are set forth with particularity in the appended clai
REFERENCES:
patent: 5548433 (1996-08-01), Smith
patent: 5761228 (1998-06-01), Yano
8106 IEEE Journal of Quantum Electronics 28 (1992) Apr., No. 4, New York, US Optical Tank Circuits Used for All-Optical Timing Recovery--Masahiko Jinno et al., pp. 895-900.
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IEEE Photonics Technology Letters, vol. 6, No. 1, Jan. 1994--"18 GHz All-Optical Frequency Locking and Clock Recovery Using a Self-Pulsating Two-Section DFB-Laser" --U. Feiste et al--pp. 106-108.
IEEE Photonics Technology Letters, vol. 3, No. 10, Oct. 1991--All-Optical Clock Recovery from 5 Gb/s RZ Data Using a Self-Pulsating 1.56 .mu.m Laser Diode--P.E. Barnsley et al--pp. 942-945.
Electronics Letters Sep. 10th 1992 vol. 28, No. 19--All-Optical Clock Recovery Using A Mode-Locked Laser--K. Smith et al., pp. 1814-1816.
Electronics Letters May 12th 1994, vol. 30, No. 10, "Enhanced Recovery Rates In Semiconductor Laser Amplifiers Using Optical Pumping" --R.J. Manning et al., pp. 787-788.
Electronics Letters Jan. 20th 1994, vol. 30, No. 2, 20 Gbit/s All-Optical Clock Recovery Using Semiconductor Nonlinearity, D.M. Patrick et al., pp. 151-152.
Electronics Letters Jul. 22nd 1993, vol. 29, No. 15, All Optical Clock Recovery At Bit Rates Up To 40 Gbit/s--A.D. Ellis et al--pp. 1323-1324.
Negash Kinfe-Michael
Siemens Aktiengesellschaft
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