Optical waveguides – With optical coupler – Input/output coupler
Reexamination Certificate
2001-01-08
2002-09-17
Palmer, Phan T. H. (Department: 2874)
Optical waveguides
With optical coupler
Input/output coupler
C385S024000, C385S122000
Reexamination Certificate
active
06453093
ABSTRACT:
TECHNICAL FIELD
This application relates to compensation for optical dispersion, and more specifically, to techniques and systems for reducing chromatic dispersion in optical media such as optic fiber links.
BACKGROUND
Many optical fibers and other optical transmission media can exhibit chromatic dispersion when different spectral components at different wavelengths in an optical signal travel at different speeds. An optical pulse, which comprises different optical spectral components, therefore, can be broadened or distorted in shape after propagation through a distance in such a dispersive optical medium. This dispersion effect can be undesirable and even adverse for certain applications such as optical communication systems where information is encoded, processed, and transmitted through optical pulses. The pulse broadening caused by the dispersion can limit the transmission bit rate, the transmission bandwidth, and other performance factors of the optical communication systems.
One way to mitigate the chromatic dispersion in dispersive optical fibers and other optical transmission media is dispersion compensation which introduces dispersion in an optical signal to negate the dispersion accumulated in that optical signal. In a wavelength-division multiplexed (WDM) optical systems, multiple WDM optical channels at different wavelengths are simultaneously transmitted through a fiber system. Since the dispersion in different WDM channels may be different, it may be desirable to provide different amounts of dispersion compensation to different WDM channels at the same time. In addition, since the dispersion in the WDM channels may vary over time, it may also be desirable to adjust the dispersion compensation in time for different WDM channels.
SUMMARY
One embodiment of the present disclosure includes a fiber grating formed in a fiber and configured to have a spatial grating pattern that changes nonlinearly along the fiber to exhibit up to at least a third-order nonlinear dispersion effect so as to produce a tunable dispersion slope. A grating control unit may be coupled to the fiber grating and is operable to adjust a grating parameter of the fiber grating to tune both dispersion and dispersion slope produced by the fiber grating.
REFERENCES:
patent: 5450427 (1995-09-01), Fermann et al.
patent: 5499134 (1996-03-01), Galvanauskas et al.
patent: 5511083 (1996-04-01), D'Amato et al.
patent: 5532868 (1996-07-01), Gnauck et al.
patent: 5541947 (1996-07-01), Mourou et al.
patent: 5633885 (1997-05-01), Galvanauskas et al.
patent: 5675674 (1997-10-01), Weis
patent: 5808779 (1998-09-01), Weis
patent: 5978131 (1999-11-01), Lauzon et al.
patent: 5982963 (1999-11-01), Feng et al.
patent: 5999546 (1999-12-01), Espindola et al.
patent: 5999671 (1999-12-01), Jin et al.
patent: 6014480 (2000-01-01), Baney
patent: 6081640 (2000-06-01), Ouellette et al.
patent: 6148127 (2000-11-01), Adams et al.
patent: 6330383 (2001-12-01), Cai et al.
patent: WO 99/22255 (1999-05-01), None
J.L. Cruz et al.,Fibre Bragg gratings tuned and chirped using magnetic fields, Electronic Letters, Jan. 30th1997, vol. 33, No. 3, pp. 235-236.
Ronald D. Esman,Microwave/ Analog Technology, cleo '97 Technical Digest, paper CWN1, pp. 293, 1997.
J.L. Arce-Diego et al.,Fiber Bragg grating as an optical filter tuned by a magnetic field, Optics Letters, May 1, 1997, vol. 22, No. 9, pp. 603-605.
R. J. Nuyts,Performance Improvement of 10 Gb/s Standard Fiber Transmission System by Using the SPM Effect in the Dispersion Compensating Fiber, IEEE Photonics Technology Letters, Oct. 1996. vol. 8, No. 10, 1406-1408.
Morten Ibsen et al.,Sinc-Sampled Fiber Bragg Gratings for Identical Multiple Wavelength Operation, IEEE Photonics Technology Letters, Jun. 1998, vol. 10, No. 6, pp. 842-844.
M. Tomizawa et al.,Nonlinear influence on PM-AM conversion measurement of group velocity dispersion in optical fibres, Electronic Letters, Aug. 18th1994, vol. 30, No.17, pp. 1434-1435.
W.F. Liu and P.St. J. Russel et al.,Improved Efficiency Narrow-Band Acoustooptic Tunable Reflector using Fibre Bragg Grating, Optoelectronics (1997).
Lee Sanggeon
Pan Zhongqi
Willner Alan E.
Xie Yong
Palmer Phan T. H.
Univerisity of Southern California
LandOfFree
Tunable optical dispersion-slope compensation based on a... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Tunable optical dispersion-slope compensation based on a..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tunable optical dispersion-slope compensation based on a... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2899863