All-Optical Format Conversion for Star-8QAM Signals Based on Nonlinear Effects in Elastic Optical Networks

Li, Qiankun; Yang, Xiongwei; Wen, Huashun; Xu, Qi; Yang, Jiali; Yang, Huajun

doi:10.1109/jlt.2022.3216841

Cited by 9 publications

(8 citation statements)

References 35 publications

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“…Despite the different application scenarios, we obtained theoretical support for the dual-pump PSA from the demonstrations in several studies 14 , 16 – 19 …”

Section: Introductionmentioning

confidence: 85%

“…Despite the different application scenarios, we obtained theoretical support for the dual-pump PSA from the demonstrations in several studies. 14,[16][17][18][19] In this paper, a conversion system for conventional conversion schemes is proposed to achieve complete conversion of information from one Star-8QAM to two PAM4s in a silicon-PTS hybrid waveguide using a rotating gain axis. In addition, by optimizing the waveguide structure, a fairly flat linear phase mismatch between 1310 and 1890 nm is obtained with a small effective mode area of 0.128 μm 2 .…”

Section: Introductionmentioning

confidence: 99%

“…Li et al. proposed an all-optical format conversion scheme for star-8QAM signals based on HNLF that achieved flexible signal conversion through two stages of signal deaggregation 19 . The system achieved conversion and exhibited good performance even for low quality input signals.…”

Section: Introductionmentioning

confidence: 99%

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Star-8QAM to PAM4 format conversion in highly nonlinear silicon-PTS waveguides

Wu,

Li,

Ren

et al. 2023

Opt. Eng.

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.The optical modulation format conversion scheme of converting star quadrature amplitude modulation signals to four-stage pulse amplitude modulation signals is theoretically realized by combining phase-sensitive amplification in a silicon-p-toluene sulphonate hybrid waveguide. By optimizing the waveguide structure, a phase mismatch bandwidth from 1310 to 1890 nm and an ultra-high nonlinear coefficient of 6.966 × 103 m − 1 W − 1 are obtained. Constellation plots, error vector magnitude, and bit error rate (BER) are used to evaluate the conversion scheme. Simulation results show that the scheme not only ensures the integrity of the signal information before and after conversion but also achieves nearly 12 dB performance improvement in the converted signal with a BER threshold of 10 − 3. It is further shown that the scheme has great potential for applications such as long-short distance interconnections and hierarchical modulation of advanced format signals.

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“…Despite the different application scenarios, we obtained theoretical support for the dual-pump PSA from the demonstrations in several studies 14 , 16 – 19 …”

Section: Introductionmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Star-8QAM to PAM4 format conversion in highly nonlinear silicon-PTS waveguides

Wu,

Li,

Ren

et al. 2023

Opt. Eng.

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“…Data traffic flows at high speed in both directions between optical nodes in different optical networks, for instance, local access network (LAN) and backbone optical network (BON). The data traffic aggregation and de-aggregation brings the modulation format interconversion between simple and advanced modulation formats [2]. Since the limitation of the electronic rate bottleneck, all-optical signal processing (AOSP)-assisted optical networks have been the research hot spot in the development of the future optical network [3], [4].…”

Section: Introductionmentioning

confidence: 99%

All-Optical Format Conversion for Rectangular 8QAM Signals Based on Phase-Sensitive Amplification and Nonlinear Mach-Zehnder Interferometer

Li,

Yang,

Wen

et al. 2024

IEEE Photonics J.

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An all-optical format conversion (AOFC) scheme for the input 30 Gbit/s rectangular 8-ary quadrature amplitude modulation (8QAM) signal is proposed and numerically investigated based on phase-sensitive amplification (PSA) and nonlinear Mach-Zehnder interferometer (MZI). Firstly, the input rectangular 8QAM signal is orthogonal decomposed into the inphase and quadrature components based on PSA, respectively. The in-phase component is the 4-ary amplitude and phase shift keying (4APSK) signal and the quadrature component is the binary phase shift keying (BPSK) signal. Secondly, the converted 4APSK signal is transmitted into one piece of highly nonlinear fiber (HNLF) to obtain the phase-distorted two-amplitude and two-phase (2A-2P) signal based on the self-phase modulation (SPM) effect. After adjusting the power of the 2A-2P signal, it is injected into one nonlinear MZI to eliminate the amplitude difference of the inner and the outer rings of the 2A-2P signal. The 2A-2P signal can be converted into the regular quadrature phase shift keying (QPSK) signal by the nonlinear MZI with phase preservation. Thirdly, the converted BPSK and QPSK signals are coherently superposed in one 3-dB optical coupler (OC) to get the aggregated rectangular 8QAM signal and other types of 8QAM signals. The proposed scheme can also be extended to realize the AOFC from the 16-ary quadrature amplitude modulation (16QAM) signal to two QPSK signals. The constellation diagrams, amplitude and phase histograms, error vector magnitude (EVM) and bit error rate (BER) of the relevant optical signals are measured to evaluate the system performance. The proposed scheme can be equipped with the optical gateway to enable all-optical interconnection of optical networks with different modulation formats.

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“…The simple modulation formats can be used in the local access network (LAN) and the metro access network (MAN). Additionally, the direct detection method is helpful to reduce the cost per bit especially for the amounts of users and terminals [3]- [5]. When the optical signal is transmitted between the optical networks, the network node as a links relay node may have the ability to regenerate the optical signals, so as to increase the transmission distance.…”

mentioning

confidence: 99%

All-Optical Regeneration and Format Conversion for 4APSK Signals Based on Nonlinear Effects in HNLF

Wen

Yang

et al. 2023

IEEE Photonics J.

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An all-optical format conversion and regeneration 1 scheme about 4-ary amplitude and phase shift keying (4APSK) 2 signals is proposed and numerically simulated based on nonlinear 3 effects in the high nonlinear fiber (HNLF). The input 4APSK 4 signal is firstly converted into a regular quadrature phase 5 shift keying (QPSK) signal by the nonlinear Mach-Zehnder 6 interferometer (MZI) based on the self-phase modulation (SPM).7 Secondly, a degenerate phase-sensitive amplification (PSA) based 8 on the four-wave mixing (FWM) is utilized to convert the 9 regular-QPSK into two binary phase shift keying (BPSK) signals. 10 The nonlinear MZI configuration is also used to compress the 11 amplitude noise of BPSK. Thirdly, one phase shifter and one 12 variable optical attenuator (VOA) are used to adjust the relative 13 phase and power relationships of the two amplitude-regenerated 14 BPSK signals. The regenerated 4APSK and converted QPSK 15 signals can be generated in one 3-dB optical coupler through 16 coherent addition of the two regenerated BPSK signals. The 17 error-vector-magnitude (EVM) and the bit-error-rate (BER) are 18 calculated and compared to evaluate the scheme performance. 19 The proposed scheme can be applied as an optical regenerator 20 or format convertor at the network gateway to increase the 21 transmission distance or connect optical networks with different 22 modulation formats. 23 Index Terms-quadrature phase shift keying, amplitude and 24 phase shift keying, self-phase modulation, four-wave mixing, 25 nonlinear Mach-Zehnder interferometer, phase-sensitive ampli-26 fication. 27 I. INTRODUCTION 28 W ITH the development of emerging technologies and 29 services, including the Internet of Energy (IoE), the 30 Internet of Things (IoT), the big data, the cloud comput-31 ing, the artificial intelligence (AI) and the fifth-generation 32

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All-Optical Format Conversion for Star-8QAM Signals Based on Nonlinear Effects in Elastic Optical Networks

Cited by 9 publications

References 35 publications

Star-8QAM to PAM4 format conversion in highly nonlinear silicon-PTS waveguides

Star-8QAM to PAM4 format conversion in highly nonlinear silicon-PTS waveguides

All-Optical Format Conversion for Rectangular 8QAM Signals Based on Phase-Sensitive Amplification and Nonlinear Mach-Zehnder Interferometer

All-Optical Regeneration and Format Conversion for 4APSK Signals Based on Nonlinear Effects in HNLF

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