研究目的
To propose and demonstrate an all-optical wavelength conversion of Nyquist-DP-16QAM based on microwave photonics for flex-grid optical networks with 112 Gbps transmission rate, aiming to improve spectrum efficiency and flexibility without using semiconductor optical amplifiers to avoid noise accumulation.
研究成果
The research successfully demonstrates that microwave photonics-based all-optical wavelength conversion for Nyquist-DP-16QAM in flex-grid optical networks can achieve BER below the FEC threshold of 3.8e-3 for multiple channels without using SOA, thus avoiding additional noise. The channel performance can be optimized by adjusting frequency spacing and amplitude, providing flexible grid solutions. Future work could involve experimental validation and extension to higher-order modulations.
研究不足
The study is based on simulation (using OPTISYSTEM and MATLAB) rather than experimental validation, which may not fully capture real-world impairments. The performance is evaluated only for specific configurations (e.g., frequency spacing from 15 GHz to 36 GHz), and the method may have constraints in scalability or practical implementation in physical optical networks.
1：Experimental Design and Method Selection:
The study uses a simulation-based approach with OPTISYSTEM and MATLAB to model microwave photonics signal generation and all-optical wavelength conversion. It leverages a duo-port Mach-Zehnder modulator (DMZM) for signal modulation and avoids semiconductor optical amplifiers to prevent noise.
2：Sample Selection and Data Sources:
A pseudorandom bit sequence of length 2^15 - 1 is used for digital baseband signal generation, with a transmitted sequence-length of 524,288 bits, samples per bit as 4, and guard-bits as
3：List of Experimental Equipment and Materials:
Includes tunable radio frequency generator (TRFG), continuous wave laser (CW laser), DMZM, erbium doped fiber amplifier (EDFA), Gaussian distributed optical white noise (GDOWN), local oscillator (LO), rectangle optical filter (ROF), photonic coherent detection, and digital signal processor (DSP). Specific parameters are configured for each component.
4：Experimental Procedures and Operational Workflow:
RF signals from TRFG modulate optical signals from CW laser via DMZM to generate multi-channel photonic signals. The frequency spacing is adjusted from 15 GHz to 36 GHz. The signals are amplified by EDFA, filtered by ROF, and demodulated using coherent detection and DSP for analysis of BER, EVM, and OSNR.
5：Data Analysis Methods:
Data is processed using MATLAB and OPTISYSTEM with algorithms for dispersion compensation, nonlinear compensation, timing recovery, adaptive equalization, frequency offset estimation, and carrier phase estimation. Statistical analysis includes relationships between BER, EVM, and OSNR.
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