A fully integrated 10-Gb/s receiver with adaptive optical dispersion equalizer in 0.13-μm CMOS

A 10 Gb/s receiver, containing an adaptive equalizer, a clock and data recovery, and a de-multiplexer, is implemented in 0.13-mu m CMOS. The chip is intended for long-haul optical fiber links where chromatic and polarization mode dispersions are reach-limiting factors. The equalization is performed by a continuous time filter and a two-tap decision feedback equalizer while automatic threshold and phase adjustments are embedded in the CDR. Use of an analog equalizer with digital adaptation garners total power dissipation of 950 mw. Error-free operation over 200 km of single mode fiber is demonstrated. With 140 kin of single mode fiber, optical signal to noise ratio penalty is only 2 dB. Differential group delay of 100 ps can also be tolerated.