Linear optical signal processing with optical filters: a tutorial

doi:10.1007/s12200-016-0554-y

Front. Optoelectron.

2016, Vol. 9

Issue (3) : 377-389 https://doi.org/10.1007/s12200-016-0554-y

TUTORIAL ARTICLE

Linear optical signal processing with optical filters: a tutorial

Xinliang ZHANG(

),Zhao WU

Wuhan National Laboratory for Optoelectronics (WNLO), School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China

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Abstract

An effective theoretical analysis method is presented to analyze different linear optical signal processing functions with optical filters reported in literatures. For different applications, the optical filters are supposed to operate on the analog or digital part of the signal separately, namely analog spectrum conversion and digital spectrum conversion. For instance, the return-to-zero (RZ) to non-return-to-zero (NRZ) format conversion for intensity or phase modulated signals are based on the analog spectrum conversion process, while the (N)RZ to (N)RZ phase-shift-keying (PSK) format conversion, logic NOT gate and clock recovery for RZ signals are based on the digital spectrum conversion process. Theoretical analyses with the help of numerical simulation are used to verify the reported experimental results, and all the experimental results can be effectively analyzed with this analytical model. The effect of the transmission spectrum of the filter on the performance of the converted signal is investigated. The most important factor is that the theoretical analysis provides an effective way to optimize the optical filter for different optical signal processing functions.

Keywords linear optical signal processing format conversion optical filter clock recovery logic gate

Corresponding Author(s): Xinliang ZHANG

Just Accepted Date: 20 July 2016 Online First Date: 13 September 2016 Issue Date: 28 September 2016

Cite this article:

Xinliang ZHANG,Zhao WU. Linear optical signal processing with optical filters: a tutorial[J]. Front. Optoelectron., 2016, 9(3): 377-389.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-016-0554-y
https://academic.hep.com.cn/foe/EN/Y2016/V9/I3/377

Fig.1 (a) Spectrum, (b) analog spectrum and (c) digital spectrum of the 33% RZ signal

Fig.2 (a) Analog part and (b) analog spectra of the NRZ and RZ signal

Fig.3 Digital spectrum of the RZ signal

Fig.4 (a) Waveform of the RZ pulse; (b) spectrum of the RZ pulse and the transmission spectrum of DI; (c) waveform and (d) spectrum of the converted NRZ pulse

Fig.5 (a) Waveform of the RZ signal; (b) spectrum of the RZ signal and the transmission spectrum of DI; (c) analog spectrum of the RZ signal and the transmission spectrum of DI; (d) digital spectrum of the RZ signal; (e) waveform, (f) spectrum, (g) analog spectrum, and (h) digital spectrum of the converted NRZ signal

Fig.6 Waveform of the converted (a) DPSK and (b) QPSK signals

Fig.7 Two adjacent converted NRZ pulses with different phase transitions

Fig.8 Digital spectrum conversion for OOK to (a) PSK and (b) clock recovery

Fig.9 (a) Waveform of the RZ signal; (b) spectrum of the RZ signal and the transmission spectrum of the through port of MRR; (c) analog spectrum of RZ signal; (d) digital spectrum of RZ signal and the transmission spectrum of MRR; (e) waveform, (f) spectrum, (g) analog spectrum, and (h) digital spectrum of the converted RZ-PSK signal

Fig.10 (a) Waveform of the NRZ signal; (b) spectrum of the NRZ signal and the transmission spectrum of the through port of MRR; (c) waveform and (d) spectrum of the converted NRZ-PSK signal

Fig.11 (a) Waveform of the RZ signal; (b) spectrum of the RZ signal and the transmission spectrum of the drop port of MRR; (c) analog spectrum of the RZ signal; (d) digital spectrum of the RZ signal and the transmission spectrum of MRR; (e) waveform, (f) spectrum, (g) analog spectrum, and (h) digital spectrum of the recovered clock

Fig.12 (a) Spectrum of the 33% RZ signal and the through transmission spectrum of imperfect MRR; (b) constellation diagram of the converted RZ-PSK signal

Fig.13 (a) Spectrum of the 33% RZ signal and the drop transmission spectrum of imperfect MRR; (b) constellation diagram of the recovered clock

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