Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 27,
  • Issue 8,
  • pp. 989-999
  • (2009)

Hardware-Efficient Coherent Digital Receiver Concept With Feedforward Carrier Recovery for $M$-QAM Constellations

Not Accessible

Your library or personal account may give you access

Abstract

This paper presents a novel digital feedforward carrier recovery algorithm for arbitrary $M$-ary quadrature amplitude modulation ($M$-QAM) constellations in an intradyne coherent optical receiver. The approach does not contain any feedback loop and is therefore highly tolerant against laser phase noise. This is crucial, especially for higher order QAM constellations, which inherently have a smaller phase noise tolerance due to the lower spacing between adjacent constellation points. In addition to the mathematical description of the proposed carrier recovery algorithm also a possible hardware-efficient implementation in a parallelized system is presented and the performance of the algorithm is evaluated by Monte Carlo simulations for square 4-QAM (QPSK), 16-QAM, 64-QAM, and 256-QAM. For the simulations ASE noise and laser phase noise are considered as well as analog-to-digital converter (ADC) and internal resolution effects. For a 1 dB penalty at ${\rm BER} = 10^{- 3}$, linewidth times symbol duration products of $4.1\times 10^{- 4}$ (4-QAM), $1.4\times 10^{- 4}$ (16-QAM), $4.0\times 10^{- 5}$ (64-QAM) and $8.0\times 10^{- 6}$ (256-QAM) are tolerable.

© 2009 IEEE

PDF Article

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2022 | Optica Publishing Group. All Rights Reserved