For semiconductor lasers directly modulated at high data rates, frequency-shift-keyed (FSK) modulation formats are preferable to amplitude-shift-keyed (ASK) formats for several reasons. The current drive to the laser required for FSK modulation (which slightly changes the laser frequency while the laser is biased well above threshold) is typically much smaller than that required for ASK modulation (which drives the laser from a high bias level down to near threshold).

© 1989 Optical Society of America

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