Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1992-12-17
1994-11-08
Chilcot, Jr., Richard E.
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359181, 359245, 359259, 385 2, H04B 1004
Patent
active
053632303
ABSTRACT:
A method of linearizing a modulator (1) having two parallel-coupled sub-modulators (2, 3). The complete transmission function of the modulator includes parameters which relate to power division (A, 1-A) of a non-modulated carrier wave (P.sub.in) and a relationship (B) between the activation degree of the sub-modulators (2, 3). The transmission function is simplified and series-expanded with two higher-order terms, each having a respective coefficient. An expression for intermodulation distortion is calculated with the aid of the series-expansion and with control signals (V1, V2) having two or three frequencies. The signs of the coefficients are determined so that the terms having these coefficients will mutually counteract their respective distortion contributions, and limited search regions for the parameters (A, B) are calculated with the aid of the sign-determined coefficients. In accordance with secondary conditions for high electrooptic efficiency and pronounced modulation depth, the distortion level of the modulator is calculated with the aid of the complete transmission function in the search regions.
REFERENCES:
patent: 4340272 (1982-07-01), Papuchon et al.
patent: 4447116 (1984-05-01), King et al.
patent: 4798429 (1989-01-01), Djupsjobacka
patent: 4820009 (1989-04-01), Thantyavarn
patent: 4842367 (1989-06-01), Djupsjobacka
patent: 4850667 (1989-07-01), Djupsjobacka
patent: 4878030 (1989-10-01), Vincze
patent: 5002353 (1991-03-01), Johnson
patent: 5003624 (1991-03-01), Terbrack et al.
patent: 5148503 (1992-09-01), Skeie
patent: 5161206 (1992-11-01), Djupsjobacka
patent: 5249243 (1993-09-01), Skeie
P. Ashley et al., "Linearization Technique for a Guided-Wave Electrooptic Brag Modulator", Proc. IGWO, poster paper THCC12 (Feb. 1986).
G. Betts et al., "On the Linear Dynamic Range of Integrated Electrooptic Modualtors", IEEE Journal of Quantum Electronics vol. QE-22, pp. 1009-1011 (Jul. 1986).
J. L. Brooks et al., "Implementation of Dual Parallel Modulation in Lithium Niobate", Integrated Photonics Research, p. 55 (1991).
W. K. Burns et al., "Interferometric Waveguide Modulator with Polarization Independent Operation", Appl. Phys. Lett. vol. 33, pp. 944-947 (Dec. 1, 1978).
L. M. Johnson et al., "Reduction of Intermodulation Distortion in Interferometric Optical Modulators", Optics Letters vol. 13, pp. 928-930 (Oct. 1988).
S. K. Korotky et al., "Dual Parallel Modulation Schemes for Low-Distortion Analog Optical Transmission", IEEE Journal on Selected Areas in Communications vol. 8, pp. 1377-1381 (Sep. 1990).
J. J. Pan, "High Dynamic Range Microwave Electro-Optic Modulators", SPIE vol. 1102, pp. 20-29 (1989).
R. V. Schmidt et al., "Directional Coupler Switches, Modulators, and Filters Using Alternating .DELTA..beta. Techniques", IEEE Transactions on Circuits and Systems vol. CAS-26, pp. 1099-1108 (Dec. 1979).
E. M. Zolotov et al., "Integrated Optical Mach-Zehnder Modulator with a Linearized Modulation Characteristic", Sov. J. Quantum Electron. vol. 18, pp. 401-402 (Mar. 1988).
Bacares Rafael
Chilcot Jr. Richard E.
Telefonaktiebolaget L M Ericsson
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