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Vol. 225, Issue 9, September 2018, pp. 49-55




Digital Multiband DP-M-QAM System Using Dual-phase-conjugated Code i
n Long-haul Fiber Transmission with Polarization-dependent Loss

* Takahiro Kodama and Masanori Hanawa

Graduate Faculty of Interdisciplinary Research, University of Yamanashi, 4-3-11 Takeda Kofu, 400-8510
Tel.: +81552208668

* E-mail: tkodama@yamanashi.ac.jp


Received: 25 June 2018 /Accepted: 31 August 2018 /Published: 30 September 2018

Digital Sensors and Sensor Sysstems


Abstract: A digital multiband DP-M-QAM transmission with a polarization- domain dual phase-conjugated code has been demonstrated for simultaneously mitigating fiber nonlinear effects on straight forward SMF transmission when the PDL is occurred in the optical transmitter. However, the linear and nonlinear crosstalk are occurred in the multiband DP-16QAM signal that satisfy the Nyquist criterion subband spacing, so it deteriorates more than single carrier transmission. We observed that the crosstalk is not affected by setting the ratio of subband spacing and subband bandwidth to 1.02 or more when a roll-off of the Nyquist filter is set to 0.01. The Q-factors of 10000 km 4SB-DP-4QAM and 2400 km 4SB-DP-16QAM transmission using dual-phase- conjugated code show 0.9 dB and 0.3 dB improvement. While the optimum fiber input power varies between two polarizations in the case of single-band and multiband transmission without dual phase-conjugated code, the phase-conjugate code can equalize the optimum fiber input power between two polarizations for all subbands.


Keywords: Multiband, Dual-polarization multiplexing, Modulation, Coherent detection, Long-haul transmission, Fiber nonlinearlity, Polarization dependent loss.


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