Title :
Variable-Precision Distributed Arithmetic (VPDA) MIMO Equalizer for Power-and-Area-Efficient 112 Gb/s Optical DP-QPSK Systems
Author :
Kwon, Soon-Won ; Bae, Hyeon-Min
Author_Institution :
Dept. of Electr. Eng., Korea Adv. Inst. of Sci. & Technol. (KAIST), Daejeon, South Korea
Abstract :
A variable-precision distributed arithmetic (VPDA) multi-input multi-output (MIMO) equalizer is presented to reduce the size and dynamic power of 112 Gb/s dual-polarization quadrature phase-shift-keying (DP-QPSK) coherent optical communication receivers for 80 km metro applications. The VPDA MIMO equalizer compensates for channel dispersion as well as various non-idealities of a time-interleaved successive approximation register (SAR) based analog-to-digital converter (ADC) simultaneously by using a least mean square (LMS) algorithm. As a result, area-hungry analog domain calibration circuits are not required. In addition, the VPDA MIMO equalizer achieves 45% dynamic power reduction over fixed resolution counterparts by utilizing the minimum required resolution for the equalization of each dispersed symbol.
Keywords :
MIMO communication; analogue-digital conversion; equalisers; least mean squares methods; optical communication; optical receivers; quadrature phase shift keying; analog-to-digital converter; bit rate 112 Gbit/s; channel dispersion; coherent optical communication receivers; distance 80 km; dual-polarization quadrature phase-shift-keying; least mean square algorithm; metro applications; multiinput multioutput equalizer; power-and-area-efficient optical DP-QPSK systems; time-interleaved successive approximation register; variable-precision distributed arithmetic MIMO equalizer; Dispersion; Equalizers; MIMO; Optical receivers; Silicon; Wavelength division multiplexing; Analog-digital conversion; digital signal processors; equalizer; optical receivers; power dissipation;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2012.2230244
