Abstract
We experimentally demonstrate on-chip mode-selective wavelength conversions based on the degenerate four-wave mixing (FWM) nonlinear effect in a few-mode silicon waveguide. A multimode waveguide with tapered directional coupler based mode (de)multiplexers is designed and fabricated. Using signals with advanced modulation formats all-optical wavelength conversions of 102.6-Gb/s OFDM-QPSK signals are verified. Experimental results show that only small optical signal-to-noise ratio (OSNR) penalties are observed after wavelength conversion of both modes, which are less than 2 dB for OFDM-QPSK at 7% forward error correction (FEC) threshold.
Highlights
Mode division multiplexing (MDM) has recently been demonstrated as an effective method to increase the capacity in fiber communication systems [1], as well as on-chip optical interconnections [2,3,4]
We experimentally demonstrate on-chip mode-selective wavelength conversions based on the degenerate four-wave mixing (FWM) nonlinear effect in a few-mode silicon waveguide
Experimental results show that only small optical signal-to-noise ratio (OSNR) penalties are observed after wavelength conversion of both modes, which are less than 2 dB for OFDMQPSK at 7% forward error correction (FEC) threshold
Summary
Mode division multiplexing (MDM) has recently been demonstrated as an effective method to increase the capacity in fiber communication systems [1], as well as on-chip optical interconnections [2,3,4]. It can offer new degrees of freedom for the implementation of both fiber and on-chip networks. We have recently proposed and demonstrated all-optical wavelength conversion for MDM fiber networks without addressing individual modes based on three semiconductor optical amplifiers (SOAs) with large size and high power consumption [6]. After coherent detection and digital signal processing (DSP), the experimental results show 0.5 dB and 0.7 dB power penalty for the conversion of each mode taken individually, as well as 1.4 dB and 1.9 dB excess conversion penalty when both signal modes co-propagate in the multimode silicon waveguide
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