Title :
40 Gb/s CAP32 System With DD-LMS Equalizer for Short Reach Optical Transmissions
Author :
Li Tao ; Yiguang Wang ; Yuliang Gao ; Lau, Alan Pak Tao ; Nan Chi ; Chao Lu
Author_Institution :
Dept. of Commun. Sci. & Eng., Fudan Univ., Shanghai, China
Abstract :
Carrierless amplitude and phase (CAP) modulation is a promising candidate for short reach optical communications. In this letter, we propose the use of decision-directed least mean square (DD-LMS) adaptive equalization algorithm for high-order CAP transmission systems. The optimal length of taps and step size of DD-LMS algorithm is investigated for 30 Gb/s and 40 Gb/s CAP32 systems. A hybrid equalization technique that consists of DD-LMS and its aided two-stage pre-convergence is proposed that allows experimental transmission of 40 Gb/s CAP32 40 km standard single mode fiber (SSMF).
Keywords :
adaptive equalisers; adaptive optics; amplitude modulation; least mean squares methods; optical communication equipment; optical fibre communication; optical modulation; phase modulation; CAP32 System; DD-LMS equalizer; SSMF; bit rate 30 Gbit/s; bit rate 40 Gbit/s; carrierless amplitude modulation; decision-directed least mean square adaptive equalization algorithm; distance 40 km; high-order CAP transmission systems; hybrid equalization technique; phase modulation; short reach optical communications; short reach optical transmissions; standard single mode fiber; two-stage preconvergence; Adaptive equalizers; Bit error rate; Modulation; Optical fiber communication; Optical fibers; Optical filters; Carrierless amplitude and phase; DD-LMS; adaptive equalization;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2013.2287529
