Picosecond Pulse Generation for High-Speed Optical Time Division Multiplexing Systems
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چکیده
In an ultrahigh speed OTDM system, picosecond or subpicosecond optical data pulses are transmitted through a fibre link. The optical pulses used in such OTDM systems should have the following characteristics: narrow pulsewidth, high extinction ratio, small timing jitter, repetition-rate tunability, and long term stability. Up to now, several techniques have been developed to produce optical pulses suitable for high-speed optical communication systems, including mode-locking [61, 62], gain-switching of DFB lasers [63, 64], external pulse carving using electroabsorption modulators [65-68], and super-continuum generation [69]. Among these techniques, active mode-locking of a fibre ring laser is capable of directly generating high-quality transform limited pulses on the timescale of several hundred femtoseconds to several picoseconds [70, 71]. However, such lasers usually need complex feedback control to maintain the operating stability and the pulse repetition rate is always determined by the laser cavity parameters. Another widely used approach to get picosecond pulses is to use a fast optical modulator such as an EAM to get a train of somewhat longer pulses, usually between 10 to 30ps (when driven by a 10GHz RF signal), and then to use some type of pulse compression scheme to obtain the shorter pulse width required [72]. Although in terms of
منابع مشابه
Picosecond Pulse Generation and Its Applications in High-Speed Optical Time Division Multiplexing Systems
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تاریخ انتشار 2005