Title :
Frequency and Phase Estimation for Coherent QPSK Transmission With Unlocked DFB Lasers
Author :
Hoffmann, Sebastian ; Bhandare, Suhas ; Pfau, Timo ; Adamczyk, Olaf ; Wördehoff, Christian ; Peveling, Ralf ; Porrmann, Mario ; Noé, Reinhold
Author_Institution :
Inst. of Electr. Eng., Univ. of Paderborn, Paderborn
Abstract :
This letter presents a hardware-efficient frequency estimator and an advanced phase estimation algorithm capable of tracking the phase noise of a 10-GBaud optical quadrature phase-shift-keying transmission system with standard distributed-feedback lasers in the presence of a frequency mismatch up to 1.2 GHz. This algorithm allows us to implement a digital coherent receiver without an analog frequency control circuit.
Keywords :
distributed feedback lasers; frequency estimation; optical fibre communication; optical modulation; optical noise; optical receivers; optical transmitters; phase estimation; phase noise; quadrature phase shift keying; coherent QPSK transmission; digital coherent receiver; distributed-feedback lasers; frequency estimation algorithm; hardware-efficient frequency estimator; optical quadrature phase-shift-keying transmission system; phase estimation algorithm; phase noise; unlocked DFB lasers; Frequency control; Frequency estimation; Laser noise; Optical noise; Optical receivers; Optical variables control; Phase estimation; Phase noise; Phase shift keying; Quadrature phase shift keying; Frequency estimation (FE); optical communication; phase estimation (PE); quadrature phase-shift keying (QPSK); synchronous detection;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2008.928846
