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Frontiers of Optoelectronics

Front. Optoelectron.    2019, Vol. 12 Issue (2) : 190-196     https://doi.org/10.1007/s12200-018-0817-x
RESEARCH ARTICLE
A novel modulation format identification based on amplitude histogram space
Tianliang WANG, Xiaoying LIU()
National Engineering Laboratory for Next Generation Internet Access System, School of Optical and Electronic Information (SOEI), Huazhong University of Science and Technology, Wuhan 430074, China
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Abstract

In this paper, we proposed a novel modulation format identification method for square M-quadrature amplitude modulation (M-QAM) signals which is based on amplitude histogram space of the incoming data after analog-to-digital conversion, chromatic dispersion compensation at the receiver. We demonstrated the identification of quadrature phase-shift keying (QPSK), 16-QAM, 64-QAM formats with an amplitude histogram space. Simulation results show that it achieve 100% identification accuracy when the incoming signal OSNR is 14 dB to identify the modulation format of QPSK, 16-QAM, and 64-QAM signals in digital coherent systems. The method has low complexity and small delay.

Keywords modulation format identification (MFI)      amplitude histogram space      high-order modulation format      optical performance monitoring     
Corresponding Author(s): Xiaoying LIU   
Just Accepted Date: 18 May 2018   Online First Date: 10 August 2018    Issue Date: 03 July 2019
 Cite this article:   
Tianliang WANG,Xiaoying LIU. A novel modulation format identification based on amplitude histogram space[J]. Front. Optoelectron., 2019, 12(2): 190-196.
 URL:  
http://journal.hep.com.cn/foe/EN/10.1007/s12200-018-0817-x
http://journal.hep.com.cn/foe/EN/Y2019/V12/I2/190
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Fig.1  Simulation constellation diagram of high-order modulation format (a) QPSK; (b) 16-QAM; (c) 64-QAM
Fig.2  Simulation amplitude histogram of high-order modulation format (a) QPSK; (b) 16-QAM; (c) 64-QAM
Fig.3  Digital signal processing (DSP) flow with the proposed MFI
Fig.4  Structure of the proposed transceiver. ECL: external cavity laser; EDFA: erbium-doped fiber amplifier; LO: local oscillator laser; SSMF: standard single mode fiber; OBPF: optical band-pass filter
lc/nm baud rate sample rate laser power/mW laser linewidth/kHz fiber loss/(dB·km−1) CD/(ps·nm−1·km−1)
1550 35e9 70e9 2 100 0.2±0.01 16±0.2
Tab.1  Simulation parameters of optical communication system
Fig.5  Calculated Euclidean distance of the samples signals with standard (a) QPSK, (b) 16-QAM and (c) 64-QAM in amplitude histogram space
Fig.6  Relationship between the Euclidean distance of the sampled signal with the standard modulation format and the OSNR. (a) QPSK; (b) 16-QAM; (c) 64-QAM
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