Experimental demonstration of twin-single-sideband signal detection system based on a single photodetector and without optical bandpass filter

Yu, Chongxiu; Sheng, Xia; Wang, Fu; li, zhipei; Chang, Huan; Huang, Lulu; Zhang, Qi; Xin, Xiangjun; Huang, Xin; Yan, Jinghao; Jiang, Ling; Cui, Saihua; Kong, Leyi; Cheng, Julian

doi:10.1364/oe.471639

Cited by 5 publications

(2 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To reduce the requirement of high-performance OBPF, the multiple-input and multiple-output adaptive equalization (MIMO-AEQ) algorithm is proposed to eliminate the cross-talk, 19 and the paper also points out that the system performance is better when the number of digital filter taps in the MIMO-AEQ reaches 25. Recently, an asymmetric direct detection (ADD) receiver for receiving twin-SSB (TSSB) signals is proposed, 20 – 23 which requires only one OBPF. The advantage of this approach is that one OBPF is eliminated and the system cost is reduced.…”

Section: Introductionmentioning

confidence: 99%

Asymmetric simplified coherent receiver based on twin-single-sideband signal realizes ultra-low computational complexity

Zhou,

Li,

Wang

et al. 2023

Opt. Eng.

View full text Add to dashboard Cite

Simplified coherence technology based on direct detection has been a hot topic because of its simple structure and low cost. However, some recently proposed simplified coherent receivers (SCRs) require extremely complex mathematical operations, resulting in high power consumption of digital signal processing. We design an asymmetric SCR (ASCR) based on a twin-single-sideband signal, and the field reconstruction algorithm only requires one Hilbert operation, avoiding the nonlinear mathematical operation and the digital up-sampling. Compared to the asymmetric direct detection receiver, the power consumption of the ASCR in the part of optical field reconstruction and dispersion compensation can be reduced by 79.83% under the same sensitivity. Besides, an optimal design of the optical filter and the channel equalization for the ASCR is proposed.

show abstract

Section: Introductionmentioning

confidence: 99%

Asymmetric simplified coherent receiver based on twin-single-sideband signal realizes ultra-low computational complexity

Zhou,

Li,

Wang

et al. 2023

Opt. Eng.

View full text Add to dashboard Cite

show abstract

“…With the rapid development of global communication, new diversified technologies such as artificial intelligence, cloud computing, and big data have been promoted and integrated [1][2][3]. Optical fiber communication systems are faced with the increasing demands for higher-speed and large-capacity data communication [4][5][6]. To meet the demands mentioned above, higher-order modulation technology has been widely adopted to improve spectral efficiency and channel capacity without taking up additional spectrum [7,8].…”

Section: Introductionmentioning

confidence: 99%

Hybrid Constellation Shaping 64QAM Based on Hexagonal Lattice of Constellation Subset

Liu,

Zhang,

Xin

et al. 2023

Photonics

Self Cite

View full text Add to dashboard Cite

Increasing demand for higher-speed and large-capacity data communications has driven the development of constellation shaping technology. This paper proposes a hybrid constellation shaping scheme for 64-quadrature amplitude modulation (64QAM) based on hexagonal lattice of a constellation subset. The proposed scheme aims to enhance the nonlinear tolerance of higher-order modulated signals and further improve the constellation shaping gain. The initial quantitative characterization of the constellation is firstly performed based on the hexagonal lattice structure. Then, the objective function of maximizing constellation figure of merits (CFM) is utilized to determine the position distribution of constellation points, resulting in the generation of the geometric shaping-64QAM (GS-64QAM) signal. Finally, according to concentric hexagonal layers, all constellation points are divided into multiple subsets where points within the same subset are assigned the same probability, and the hybrid shaping-64QAM (HS-64QAM) signal is generated. To validate the effectiveness of the proposed scheme, the experimental verification was demonstrated in a 120 Gbit/s multi-span coherent optical communication system. Experimental results indicate that, at the soft-decision forward error correction threshold, HS-64QAM achieves an optical signal-to-noise ratio (OSNR) gain of 1.9 dB and 4.1 dB over uniform GS-64QAM in back-to-back and 375 km transmission scenarios, respectively. Furthermore, HS-64QAM achieves an OSNR gain of 2.7 dB and 7.6 dB over uniform Square-64QAM in back-to-back and 375 km transmission scenarios, respectively.

show abstract

Hybrid transmission of PS-GS4QAM and QPSK data in the form of a PS-16QAM mm-wave signal enabled by optical asymmetrical dual-SSB modulation

Yan,

Xie,

et al. 2024

Opt. Express

View full text Add to dashboard Cite

The independent optical dual-single-sideband (dual-SSB) signal generation and detection can be achieved by an optical in-phase/quadrature (I/Q) modulator and one single photodiode (PD). The dual-SSB signal is able to carry two different information. After PD detection, the optical dual-SSB signal can be converted into an electrical millimeter-wave (mm-wave) signal. Therefore, the optical dual-SSB signal generation and detection technique can be employed in the radio-over-fiber (RoF) system to achieve higher system spectral efficiency and reduce system architecture complexity. However, the I/Q modulator's nonideal property results in the amplitude imbalance of the optical dual-SSB signal, and then the crosstalk can occur. Moreover, after PD detection, the generated mm-wave signal based on the optical dual-SSB modulation has a relatively low signal-to-noise ratio (SNR), which restricts the system performance. In this paper, we propose an optical asymmetrical dual-SSB signal generation and detection scheme based on the probabilistic shaping (PS) technology, to decrease the influence of the optical dual-SSB signal’s amplitude imbalance and to enhance the system performance in the scenario of the limited SNR. The dual-SSB in our scheme is composed of the left sideband (LSB) in probabilistic-shaping geometric-shaping 4-ary quadrature amplitude modulation (PS-GS4QAM) format and the right sideband (RSB) in quadrature phase-shift keying (QPSK) format. The transmitter digital signal processing (DSP) generates a dual-SSB signal to drive the optical I/Q modulator. The I/Q modulator implements an electrical-to-optical conversion and generates an optical dual-SSB signal. After PD detection, the optical dual-SSB signal is converted into a PS-16QAM mm-wave signal. In our simulation, compared with the normal 16QAM scenario, the PS-16QAM scenario exhibits a ∼1.2 dB receiver sensitivity improvement at the hard-decision forward error correction (HD-FEC) threshold of 3.8×10−3. Therefore, in our experiment, based on the PS technology, we design a dual-SSB signal including a 5 Gbaud LSB-PS-GS4QAM at −15 GHz and a 5 Gbaud RSB-QPSK at 20 GHz. After 5 km standard single-mode fiber (SSMF) transmission and PD detection, the dual-SSB signal is converted into a 5 Gbaud PS-16QAM mm-wave signal at 35 GHz. Then, the generated PS-16QAM signal is sent into a 1.2 m single-input-single-output (SISO) wireless link. In the DSP at the receiver end, the dual-SSB signal can be recovered from the mm-wave signal, and the PS-GS4QAM and QPSK data carried by the dual-SSB signal can be separated. The bit error rates (BERs) of the LSB-PS-GS4QAM and the RSB-QPSK in our experiment can be below the HD-FEC threshold of 3.8×10−3. The results demonstrate that our scheme can tolerate the I/Q modulator’s nonideal property and performs well in the scenario of a relatively low SNR.

show abstract

Experimental demonstration of twin-single-sideband signal detection system based on a single photodetector and without optical bandpass filter

Cited by 5 publications

References 19 publications

Asymmetric simplified coherent receiver based on twin-single-sideband signal realizes ultra-low computational complexity

Asymmetric simplified coherent receiver based on twin-single-sideband signal realizes ultra-low computational complexity

Hybrid Constellation Shaping 64QAM Based on Hexagonal Lattice of Constellation Subset

Hybrid transmission of PS-GS4QAM and QPSK data in the form of a PS-16QAM mm-wave signal enabled by optical asymmetrical dual-SSB modulation

Contact Info

Product

Resources

About