Feasibility Study of FPGA-Based Equalizer for 112-Gbit/s Optical Fiber Receivers
Paper in proceedings, 2012

With ever increasing demands on spectral efficiency, complex modulation schemes are being introduced in fiber communication. However, these schemes are challenging to implement as they drastically increase the computational burden at the fiber receiver’s end. We perform a feasibility study of implementing a 16-QAM 112-Gbit/s decision directed equalizer on a state-of-the-art FPGA platform. An FPGA offers the reconfigurability needed to allow for modulation scheme updates, however, its clock rate is limited. For this purpose, we introduce a new phase correction technique to significantly relax the delay requirement on the critical phase-recovery feedback loop.

Spectral efficiencies

Feasibility studies

Phase corrections

Complex modulation

Feed-back loop

Computational burden

Modulation schemes



Clock rate



Fredrik Toft

Chalmers, Computer Science and Engineering (Chalmers), Computer Engineering (Chalmers)

Niclas Rousk

Chalmers, Computer Science and Engineering (Chalmers), Computer Engineering (Chalmers)

Jonas Mårtensson

RISE Acreo

Marco Forzati

RISE Acreo

Bengt-Erik Olsson

Ericsson Microwave Systems AB

Per Larsson-Edefors

Chalmers, Computer Science and Engineering (Chalmers), Computer Engineering (Chalmers)

ISCAS 2012 - 2012 IEEE International Symposium on Circuits and Systems

3234-3237 6272013

Areas of Advance

Information and Communication Technology


Driving Forces

Sustainable development

Innovation and entrepreneurship

Subject Categories

Other Electrical Engineering, Electronic Engineering, Information Engineering





More information

Latest update