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Modal crosstalk in Silicon photonic multimode interconnects.
Optics Express
|November 6, 2019
Summary
Modal crosstalk in silicon photonics impacts data transmission. Minimizing crosstalk below -22 dB is crucial for maintaining high-performance optical interconnects and ensuring reliable data transfer.
Area of Science:
- Silicon photonics
- Optical interconnects
- Waveguide theory
Background:
- Modal crosstalk arises from physical variations in silicon photonic devices.
- Coherent optical interference is a primary source of crosstalk, affecting transmission link performance.
Purpose of the Study:
- To investigate modal crosstalk in silicon photonic multiplexer-based interconnects.
- To analyze the impact of optical crosstalk on Mode Division Multiplexing (MDM) and dual-multiplexing (MDM-WDM) applications.
Main Methods:
- Simulations and experimental analysis of optical crosstalk as a function of wavelength.
- Validation of detrimental effects in frequency and time domains using fabricated MDM interconnects of varying lengths.
Main Results:
- Optical crosstalk was analyzed across different wavelengths and its impact on MDM systems was quantified.
- Detrimental effects of crosstalk were experimentally validated in fabricated interconnects.
- Modal crosstalk must be below -22 dB to achieve a Bit Error Rate (BER) of 10-12.
Conclusions:
- Modal crosstalk significantly impacts the performance of silicon photonic interconnects.
- Maintaining low modal crosstalk is essential for reliable data transmission and achieving target BER.
- The study provides a basis for mitigating crosstalk and optimizing system-level parameters like wavelength allocation.
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