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Spatial-mode couplers (SMCs) are critical devices for mode-division-multiplexed (MDM) systems. In this letter, we report a low-loss symmetric SMC fabricated with custom-designed two-mode fiber and commercially available standard fused biconical taper station. Sophisticated hydrofluoric etching or pre-pulling on the fiber sample is not needed for fabrication. We characterize the performance of the...
Spatial-mode couplers (SMC) are critical devices in mode-division-multiplexed systems. We report a fused SMC with a low loss of 1.1~2 dB and high mode-extinction ratio of ≥20dB for a broad wavelength range of 1539-1555 nm.
We present analysis of the system capacity for two-mode fiber and measurement of its fiber nonlinear coefficients. Despite strong spatial overlapping of three modes, the overall capacity approaches 3 times of that of single-mode fiber.
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