Method of linearizing a transmission function of a modulator arr

Details Method of linearizing a transmission function of a modulator arr Method of linearizing a transmission function of a modulator arr

1991-10-02

1992-11-03

Ullah, Akm E.

Optical waveguides

Temporal optical modulation within an optical waveguide

Electro-optic

G02B 5172, G02B 626

Patent

active

051612062

ABSTRACT:
A modulator arrangement comprises two Mach-Zehnder modulators, a main modulator (2) and a compensation modulator (3) having non-linear transmission functions. The modulators (2, 3) are controlled by a modulating control signal (V), via electrodes (16, 17). A carrier wave (S1) from a laser (7) is power divided (a, 1-a) into part-waves in a power divider (5) between the modulators (2, 3). The modulated part-waves (S2, S3) are superimposed at an output (14) to produce a resultant modulated wave (S4). A linearized transmission function between the control voltage (V) and the power of the resultant modulated wave (S4) has a radius of curvature whose length is maximized within a control voltage range, so as to minimize intermodulation distortion. The mean slope of the transmission function is maximized within this range. At a common control voltage (V) for the modulators (2, 3), the modulator arrangement has an optimal transmission function at a length ratio b=.sqroot.3:1 between the modulators (2, 3), and a power ratio between the part-waves of .sqroot.3:9. The main modulator (2) is the shortest and modulates the strongest part-wave.

REFERENCES:
patent: 4471116 (1984-05-01), King et al.
patent: 4798429 (1989-01-01), Djupsjobacka
patent: 4842367 (1989-06-01), Djupsjobacka
patent: 4850667 (1989-07-01), Djupsjobacka
patent: 4878030 (1989-10-01), Vincze

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