Title :
Correlated and uncorrelated timing jitter in gain-switched laser diodes
Author_Institution :
NTT Transmission Syst. Labs., Yokosuka, Japan
Abstract :
The author describes correlated and uncorrelated timing jitter of gain-switched pulses generated from sinusoidally modulated laser diodes measured from photocurrent power spectra. It is found that if dc bias is decreased to obtain shorter pulses, then the root-mean-square (rms) value of uncorrelated timing jitter drastically increases to more than 2 ps, while correlated jitter remains constant at the drive circuit level of approximately 0.2 ps. By optimizing the bias condition and compression fiber length, total timing jitter of gain-switched pulses can be reduced to as low as approximately 0.5 ps, as their pulse width is kept less than 10 ps.<>
Keywords :
optical correlation; optical modulation; photoconductivity; semiconductor lasers; 0.2 ps; 0.5 ps; 10 ps; 2 ps; bias condition optimisation; compression fiber length; correlated timing jitter; dc bias; drive circuit level; gain-switched laser diodes; gain-switched pulses; photocurrent power spectra; pulse width; rms; root-mean-square; shorter pulses; sinusoidally modulated; uncorrelated timing jitter; Diode lasers; Gain measurement; Optical pulse generation; Power generation; Power measurement; Pulse compression methods; Pulse measurements; Pulse modulation; Space vector pulse width modulation; Timing jitter;
Journal_Title :
Photonics Technology Letters, IEEE