This talk will review our studies on the mode coupling mechanism and differential modal group delay characteristics of the coupled multi-core fiber, and the fabrication results of 125-μm-cladding coupled four-core fibers which realized the record-low spatial mode dispersion (SMD) of 3.14±0.17 ps/√km over C-band and the ultra-low attenuation of 0.158 dB/km at 1550 nm, both of which are the lowest ever reported among optical fibers for the space-division multiplexed transmission. By assuming the 3.14-ps/√km SMD accumulation, the tap count of the multiple-input-multiple-output digital signal processing for the crosstalk compensation is estimated to be only 63 taps for covering 99.99% power of the impulse response after 10,000-km propagation when the 25-GBaud (50-GHz sampling) is assumed. The present results demonstrate the strong and practical applicability of the coupled multi-core fiber to the ultra-long-haul transmission system.
Tetsuya Hayashi, "Coupled multicore fiber for space-division multiplexed transmission," Proc. SPIE 10130, Next-Generation Optical Communication: Components, Sub-Systems, and Systems VI, 1013003 (Presented at SPIE OPTO: January 31, 2017; Published: 28 January 2017); https://doi.org/10.1117/12.2249021.
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