Frequency shift keying (FSK) modulation is often used in coherent communication systems using semiconductor lasers.1 The most common modulation technique is by directly modulating the injection current of the laser. Enhanced FM response due to thermal effects2 causes distortion of the FSK tones, which is data pattern-dependent. Thus compensation circuitry in the form of an equalizer is required for low-distortion FSK modulation.

© 1985 Optical Society of America

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