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A high data rate electro-optic phase modulator driver for a coherent optical communications application

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3 Author(s)
Grant, C.J. ; Jet Propulsion Lab., California Inst. of Technol., Pasadena, CA, USA ; Mueller, R.O. ; Mysoor, N.

A compact phase modulator driver circuit capable of high data rates has been designed and integrated with a LiNbO3 electro-optical (EO) crystal for a coherent optical communications system. The modulator driver demonstrated the capability of producing an output signal of 20 V peak-to-peak (p-p) amplitude with a 3 dB bandwidth of 210 MHz. The input signal is 2 V p-p and the output drives a capacitive load of 3-10 pF, presented by the EO crystal and connecting cable. The driver phase transfer function shows a linear phase shift over the measured frequency range of 10 to 110 MHz, resulting in a constant group delay of 1.92 ns with less than ±2% variation over this range. The rise and fall times for a 20 V p-p pulse are less than 1.8 ns with less than 13% overshoot at the EO crystal terminals. The dc power consumption for the modulator driver increased from 2.85 W at 100 kHz to 4 W at 100 MHz

Published in:

Aerospace Applications Conference, 1994. Proceedings., 1994 IEEE

Date of Conference:

5-12 Feb 1994

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