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- Title
Phase Noise Cancellation in Coherent Communication Systems Using a Radio Frequency Pilot Tone.
- Authors
Xu, Tianhua; Jin, Cenqin; Zhang, Shuqing; Jacobsen, Gunnar; Popov, Sergei; Leeson, Mark; Liu, Tiegen
- Abstract
Featured Application: This work is performed for the compensation of the laser phase noise (LPN) and the equalization enhanced phase noise (EEPN) in high-capacity, long-haul, coherent optical fiber networks. Long-haul optical fiber communication employing digital signal processing (DSP)-based dispersion compensation can be distorted by the phenomenon of equalization-enhanced phase noise (EEPN), due to the reciprocities between the dispersion compensation unit and the local oscillator (LO) laser phase noise (LPN). The impact of EEPN scales increases with the increase of the fiber dispersion, laser linewidths, symbol rates, signal bandwidths, and the order of modulation formats. In this work, the phase noise cancellation (PNC) employing a radio frequency (RF) pilot tone in coherent optical transmission systems has been investigated. A 28-Gsym/s QPSK optical transmission system with a significant EEPN has been implemented, where the carrier phase recovery (CPR) was realized using the one-tap normalized least-mean-square (NLMS) estimation and the differential phase detection (DPD), respectively. It is shown that the RF pilot tone can entirely eliminate the LPN and efficiently suppress the EEPN when it is applied prior to the CPR.
- Subjects
PHASE noise; RADIO frequency; TELECOMMUNICATION systems; OPTICAL fiber communication; OPTICAL fiber networks; OPTICAL dispersion
- Publication
Applied Sciences (2076-3417), 2019, Vol 9, Issue 21, p4717
- ISSN
2076-3417
- Publication type
Article
- DOI
10.3390/app9214717