A method for complex spectrum analysis of modulated optical signal

Lingwei Zhuang; Yaojun Qiao; Aiying Yang; Peng Guo

doi:10.1117/12.2543786

12 March 2020 A method for complex spectrum analysis of modulated optical signal

Lingwei Zhuang, Yaojun Qiao, Aiying Yang, Peng Guo

Proceedings Volume 11435, 2019 International Conference on Optical Instruments and Technology: Optical Communication and Optical Signal Processing; 114350B (2020) https://doi.org/10.1117/12.2543786
Event: 2019 International Conference on Optical Instruments and Technology, 2019, Beijing, China

Abstract

We present a method for complex spectrum analysis of periodic optical signal with multi-level modulation format. The information of the complex spectrum can be extracted with ultra-low sampling rate in the proposed method, and the temporal information reconstructed by inverse Fourier transform can be used to monitor the performance of the optical signal. Besides, the proposed method is transparent to symbol rate and modulation format. The spectral amplitudes and phases are measured accurately in the simulation based on the proposed method for a 28 GBaud Quadrature-Phase-ShiftKeying (QPSK) signal with a 400-bit pattern and a 28 GBaud 16-Quadrature-Amplitude-Modulation(16QAM) signal with a 560-bit pattern. Moreover, we analyze the performance of the reconstructed signal under different linewidth and optical signal-to-noise ratio (OSNR) by simulation. The Q-factor of the reconstructed 28-GBaud QPSK signal reduces when the linewidth of laser increases and the OSNR of signal decreases.

Citation Download Citation

Lingwei Zhuang, Yaojun Qiao, Aiying Yang, and Peng Guo "A method for complex spectrum analysis of modulated optical signal", Proc. SPIE 11435, 2019 International Conference on Optical Instruments and Technology: Optical Communication and Optical Signal Processing, 114350B (12 March 2020); https://doi.org/10.1117/12.2543786

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KEYWORDS

Modulation

Spectrum analysis

Phase shift keying

Signal detection

Dispersion

Fourier transforms

Optical communications

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