Title :
A 10 Gb/s coherent detection system with feed-forward equalizers for optical duobinary transmission
Author :
Lee, Kil-Hoon ; Bhatta, Debesh ; Kim, Hyoungsoo ; Gebara, Edward ; Laskar, Joy
Author_Institution :
Georgia Electron. Design Center, Georgia Inst. of Technol., Atlanta, GA, USA
Abstract :
This paper presents a 10-Gb/s coherent detection system incorporating feed-forward equalizers (FFEs) and an optical duobinary modulation scheme in order to increase the transmission distance limited by chromatic dispersion in standard single-mode fibers up to 400-km without signal regeneration and optical dispersion compensation. The FFE structure is based on a finite impulse response (FIR) filter with 9 taps and 100-ps tap spacing. The FFE employs capacitor-degenerated differential pairs for the delay block implementation in order to meet the system bandwidth requirement. The coherent system also incorporates a squarer for phase-diversity detection. Both the FFE and squaring circuits are fabricated in 0.18-mum CMOS technology.
Keywords :
CMOS integrated circuits; FIR filters; equalisers; feedforward; optical fibre dispersion; optical fibre networks; optical modulation; CMOS technology; bit rate 10 Gbit/s; capacitor-degenerated differential pairs; chromatic dispersion; coherent detection system; delay block; feed-forward equalizers; finite impulse response filter; optical dispersion compensation; optical duobinary modulation; optical duobinary transmission; phase-diversity detection; signal regeneration; size 0.18 mum; squaring circuits; standard single-mode fibers; transmission distance; CMOS technology; Chromatic dispersion; Delay; Equalizers; Feedforward systems; Finite impulse response filter; Optical fiber filters; Optical filters; Optical modulation; Repeaters;
Conference_Titel :
Microwave Integrated Circuits Conference, 2009. EuMIC 2009. European
Conference_Location :
Rome
Print_ISBN :
978-1-4244-4749-7
