Novel schemes to generate multi-level modulation formats for ultra-capacity coherent detection transmission systems (Invited Paper)

2010 ◽  
Vol 8 (9) ◽  
pp. 823-830
Author(s):  
Jianjun Yu Jianjun Yu ◽  
Xiang Zhou Xiang Zhou
Keyword(s):  
Coherent Detection ◽  
Transmission Systems ◽  
Modulation Formats ◽  
Multi Level

Coherent Detection-Based Automatic Bias Control of Mach–Zehnder Modulators for Various Modulation Formats

2014 ◽  
Vol 32 (14) ◽  
pp. 2502-2509 ◽  
Author(s):  
Xiaoqi Zhu ◽  
Zhennan Zheng ◽  
Cheng Zhang ◽  
Lixin Zhu ◽  
Zhenning Tao ◽  
...  
Keyword(s):  
Coherent Detection ◽  
Modulation Formats

Performance Analysis of Digital Modulation for Coherent Detection of OFDM Scheme on Radio over Fiber System

2016 ◽  
Vol 6 (3) ◽  
pp. 1086 ◽  
Author(s):  
Fauza Khair ◽  
Fakhriy Hario P ◽  
I Wayan Mustika ◽  
Budi Setiyanto
Keyword(s):  
Error Rate ◽  
Orthogonal Frequency Division Multiplexing ◽  
Fiber Length ◽  
Direct Detection ◽  
Symbol Error Rate ◽  
Radio Over Fiber ◽  
Coherent Detection ◽  
Fiber System ◽  
Digital Modulation ◽  
Modulation Formats

Radio over fiber (RoF) system with the coherent detection offers high linearity for the transparent transport of high-frequency microwave signals, and better receiver sensitivity compared with intensity-modulated direct detection systems. The purpose of this paper is to analyze the performance of digital modulation for coherent detection of orthogonal frequency division multiplexing (OFDM) scheme on RoF system at 10 Gbps up to 100 km fiber length. The results show that coherent detection of OFDM-RoF system with 16 quadrature amplitude modulation (16-QAM) has the value of  bit error rate (BER) and the symbol error rate (SER) is very low and its constellation is better compared with other modulation formats (4-QAM, quadrature phase shift keying (QPSK), 8-PSK and 16-PSK), which BER 16-QAM is 0.053 and SER is 15.7%. The results also show that BER value of 4-QAM and QPSK relatively similar to fiber length variations. In general, an increasing value of the BER and SER for each modulation format are almost equal to the fiber length of 60-70 km (Region I and II). However, there is a significant increase in the value of BER in fiber length of 80-100 km (Region III. A and III. B) for the modulation of 4-QAM, QPSK, 8-PSK, and 16-PSK.

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