研究目的
Investigating the effect of crosstalk due to inter-core coupling on the bit error rate (BER) performance of a fiber optic communication link with a homogeneous multi-core optical fiber (MCF).
研究成果
The inter-core coupling in a 7-core homogeneous MCF is determined numerically and analyzed in terms of coupling coefficient. The influence of core pitch and relative refractive index difference on coupling coefficient is shown graphically. The inter-core coupling induced crosstalk power affects the BER performance adversely, resulting in power penalty of the system at a given BER. The findings could be used in designing and implementing optical communication systems using homogeneous MCFs to enhance transmission channel capacity.
研究不足
The study focuses on a homogeneous MCF with each core having the same relative refractive index difference and same distance apart. The impact of inter-core crosstalk on heterogeneous MCFs or other configurations is not explored.
1：Experimental Design and Method Selection:
The study employs an analytical approach to evaluate the BER performance of a 7-core homogeneous MCF link, considering the effect of inter-core coupling induced crosstalk. Coupled-mode theory (CMT) and coupled-power theory (CPT) are used to estimate the inter-core crosstalk.
2：Sample Selection and Data Sources:
A 7-core MCF optical communication link is used as the system model, with parameters including core refractive index, cladding refractive index, core radius, core-to-core distance, operating wavelength, relative index difference, cladding radius, data rate, and receiver amplifier gain.
3：List of Experimental Equipment and Materials:
The system model includes seven un-coupled Distributed Feedback (DFB) laser transmitters, PIN Photo diodes in the receivers, tapered multi-core connectors (TMC), and optical pre-amplifiers.
4：Experimental Procedures and Operational Workflow:
The MCF link is designed for operation in the 1.55 μm wavelength window. The coupling coefficients are evaluated numerically as a function of core-to-core distance and relative refractive index contrast. The BER performance is analyzed with different link distances.
5：55 μm wavelength window. The coupling coefficients are evaluated numerically as a function of core-to-core distance and relative refractive index contrast. The BER performance is analyzed with different link distances.
Data Analysis Methods:
5. Data Analysis Methods: The performance results are presented in terms of BER and power penalty due to crosstalk at a given BER and worst coupling coefficients.
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