Coherent light generators – Particular beam control device – Modulation
Patent
1993-04-19
1994-06-14
Epps, Georgia Y.
Coherent light generators
Particular beam control device
Modulation
372 29, 372 38, 372 31, 372 32, 330149, 330163, 330124R, 359109, H01S 310
Patent
active
053217101
ABSTRACT:
A predistortion circuit reduces composite second order intermodulation distortion products inherently generated by a laser diode. A radio frequency signal is split into a primary and secondary signal, and the secondary signal is amplified by an amplifier biased at a starvation current level so as to produce intermodulation distortion products having an amplitude relatively large compared to an amplitude of a fundamental generated by the amplifier. The amplitude and phase of composite second order intermodulation distortion products generated by the amplifier are adjusted so as to substantially match those inherently generated by the laser diode by the primary electrical signal, with the products being about 180.degree. out of phase relative to those generated by the laser in response to the primary signal. The adjusted distortion products are combined with the primary electrical signal, and the combined signal is fed to the laser diode resulting in an output of the laser diode having minimum composite second order intermodulation distortion products.
REFERENCES:
patent: 3202928 (1965-08-01), Prior
patent: 3457516 (1969-07-01), Blalock
patent: 4068186 (1978-01-01), Sato et al.
patent: 4075474 (1978-02-01), Straus et al.
patent: 4611352 (1986-09-01), Fujito et al.
patent: 4672192 (1987-06-01), Muka et al.
patent: 4733398 (1988-03-01), Shibagaki et al.
patent: 4992754 (1991-02-01), Blauvelt et al.
patent: 5012475 (1991-04-01), Campbell
patent: 5080506 (1992-01-01), Campbell et al.
patent: 5132639 (1992-07-01), Blauvelt et al.
Patterson et al., "Linearization of Multichannel Analog Optical Transmitters by Quasi-Feedforward Compensation Technique", IEEE Transactions on Communications, pp. 582-588, vol. COM-27, No. 3, Mar. 1979.
Franckart et al., "Analog Transmission of TV-Channels on Optical Fibers, with Non-Linearities Correction by Regulator Feedforward", ECOC 83-9th European Conference on Optical Communication, pp. 347-350.
Bertelsmeier et al., "Linearization of Broadband Optical Transmission Systems by Adaptive Predistortion", Frequenz, vol. 38, No. 9, pp. 206-212, Sep. 1984.
Karam et al., "Analysis of Predistortion, Equalization, and ISI Cancellation Techniques in Digital Radio Systems with Nonlinear Transmit Amplifiers", pp. 1245-1253, IEEE Transactions on Communications, vol. 37, No. 12, Dec. 1989.
Kumar et al., "Broadband and Broad Dynamic Range GaAs Dual-Gate Mesfet Linearizer for TWTA and SSPA Used in Satellite Transponder", 1985 IEEE MTT-S Digest, pp. 609-612.
Lenz, "Linearization of Radio-Relay Transmitters by a Predistortion Upconverter", Conference Proceedings, 11th European Microwave Conference 81, Sep. 1981, pp. 209-214.
Kathiravan et al., "Combining Prefiltering and Predistortion in a High Power Direct PSK Modulator", 1990 IEEE MTT-S Digest, pp. 877-880, 1990 IEEE MTT-S International Microwave Symposium Digest, vol. II, May 1990.
Gysel et al., "Electrical Predistortion to compensate for combined Effect of Laser Chirp and Fibre Dispersion", pp. 421-423, Electronics Letters, 28th Feb. 1991, vol. 27, No. 5.
deRidder et al., "Feedfoward compensation of integrated optic modulator distortion", 78/OFC'90/Wednesday Afternoon, 2:15PM.
Childs et al., "Predistortion linearization of directly modulated DFB lasers and external modulators for AM video transmission", OFC'90/Wednesday Afternoon/79, 2:30PM.
Nojima et al., "The design of a predistortion linearization circuit for high-level moduration radio systems", Globecom '85, IEEE Global Telecommunications Conference, Conference Record vol. 3 of 3, Dec. 1985, pp. 1466-1471.
Nojima et al., "Predistortion nonlinear compensator for microwave SSB-AM system", Electronics and Communications in Japan, vol. 67-B, No. 5, May 1984, pp. 57-66 Translated from Denshi Tsushin Gakkai Ronbunshi, vol. 67-B, No. 1, Jan. 1984, pp. 78-85.
Nojima et al., "Cuber predistortion linearizer for relay equipment in 800 MHz band land mobile telephone system", IEEE Transactions on Vehicular Technology, vol. VT-34, No. 4, Nov. 1985, pp. 169-177.
Nannicini et al., "Temperature controlled predistortion circuits for 64 AQM microwave power amplifiers", 1985 IEEE MTT-S Digest, pp. 99-102.
Cornish Peter W.
Duncan Barry
Burkard Herbert G.
Epps Georgia Y.
Raynet Corporation
LandOfFree
Predistortion method and apparatus for laser linearization does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Predistortion method and apparatus for laser linearization, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Predistortion method and apparatus for laser linearization will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1254944