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Title: 1500-km SSMF transmission of mixed 40-Gb/s CS-RZ duobinary and 100-Gb/s CS-RZ DQPSK signals
Authors: Li, Z
Cheng, L
Yang, Y
Lu, C 
Lau, APT 
Tam, H 
Wai, PKA 
Wang, C
Xu, X
Deng, J
Xiong, Q
Keywords: Carrier-suppressed return-to-zero (CS-RZ)
Differential quadrature phase-shift keying (DQPSK)
Mixed transmission
Modulation format
Optical duobinary
Issue Date: 2009
Publisher: Institute of Electrical and Electronics Engineers
Source: IEEE photonics technology letters, 2009, v. 21, no. 16, p. 1148-1150 How to cite?
Journal: IEEE photonics technology letters 
Abstract: We demonstrated transmission of eight channelsof 200-GHz channel spacing and 100-Gb/s carrier-suppressed return-to-zero (CS-RZ) differential quadrature phase-shift keying (DQPSK) signals together with eight channels of 40-Gb/s CS-RZ duobinary (DRZ) signals also with 200-GHz channel spacing in order to improve the optical spectral efficiency of the wavelength-division-multiplexing system. Each DRZ channel is inserted in the middle of two adjacent CS-RZ DQPSK channels. A bit-error rate (BER) of less than 5E-4 is achieved for the 40-Gb/s DRZ channel after 1500-km SSMF transmission while a BER of 1E-3 is achieved for the 100-Gb/s CS-RZ DQPSK signals.
ISSN: 1041-1135
EISSN: 1941-0174
DOI: 10.1109/LPT.2009.2021773
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