Title :
Optimized predistortion of overmodulated Mach-Zehnder modulators with multicarrier input
Author :
Wilson, Gordon C.
Author_Institution :
Lucent Technols., Bell Labs, Holmdel, NJ, USA
Abstract :
Using a Mach-Zehnder modulator, predistorted to third-order only, 77-channel CTBs are measured that surpass published theoretical limits. New composite triple beat (CTB) limits for nth-order predistortion are calculated. Modulator and predistorter bandwidth limitations are shown by numerical simulation to limit the CTB obtainable in practical systems.
Keywords :
Mach-Zehnder interferometers; cable television; electro-optical modulation; optical fibre subscriber loops; optical noise; optimisation; 77-channel CTB; CTB limits; Mach Zehnder interferometers; Mach-Zehnder modulator; composite triple beat; modulator bandwidth limitations; multicarrier input; nth-order predistortion; numerical simulation; optimized predistortion; overmodulated Mach-Zehnder modulators; practical systems; predistorter bandwidth limitations; third-order predistortion; Bandwidth; Interferometers; Intermodulation distortion; Numerical simulation; Optical distortion; Optical modulation; Optical transmitters; Predistortion; Transfer functions; Voltage;
Journal_Title :
Photonics Technology Letters, IEEE
