Method for linearizing an unbalanced Mach Zehnder optical freque

Details Method for linearizing an unbalanced Mach Zehnder optical freque Method for linearizing an unbalanced Mach Zehnder optical freque

1992-10-27

1994-12-13

Pascal, Leslie

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359173, 359188, 359193, 359239, H04B 1000

Patent

active

053733894

ABSTRACT:
An unbalanced Mach Zehnder optical frequency discriminator is linearized to suppress third order nonlinear distortion. An optical carrier that is modulated in optical frequency is input to an unbalanced Mach Zehnder interferometer to discriminate RF information signals carried on the carrier. The Mach Zehnder interferometer has an adjustable operating point. The operating point is adjusted to a point where the output intensity of the Mach Zehnder interferometer is no more than about ten percent of its maximum value. In order to avoid problems with second order distortion, the optical carrier is modulated with RF signals that do not occupy more than a single octave. The operating point of the device can be adjusted by adjusting an electrical bias thereof, by adjusting the wavelength of the optical carrier, or by adjusting the temperature of the device.

REFERENCES:
patent: 3597755 (1971-08-01), Parkin
patent: 4928007 (1990-05-01), Furstenau
patent: 4955086 (1990-09-01), Kindt
patent: 5166821 (1992-11-01), Huber
patent: 5187713 (1993-02-01), Kwa
patent: 5191459 (1993-03-01), Thompson
patent: 5276543 (1994-01-01), Olshansky
Donaldson, "Linearity Considerations in High Performance Amplitude Modulators", IEEE Colloquium on Analog Optical Communications, DIG. #156 pp. 4/1-5, Dec. 1992.

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