Philippe Genevaux

Efficient and mode selective spatial mode multiplexer based on multi-plane light conversion

We demonstrate a new spatial mode multiplexer based on Multi-Plane Light Conversion with very low intrinsic loss (<; 4.1 dB) and high mode selectivity (crosstalk <; -23 dB). This multiplexer can perform any mode conversion, and we demonstrate its performance for 6 eigenmodes of a few-mode fiber.

6-mode spatial multiplexer with low loss and high selectivity for transmission over few mode fiber

We present a spatial 6-mode multiplexer with low loss and high mode selectivity. We demonstrate 100Gbit/s error-free transmission over 20km for 6 modes and over 40km bi-directional transmission with 3 modes in each direction.

Comparison of QPSK and 8-QAM in a Three Spatial Modes Transmission

We present a transmission experiment employing three spatial modes through a few-mode fiber coupled to the surrounding single mode equipment by a packaged mode multiplexer and demultiplexer. We evaluate and compare the impact of the residual crosstalk in our system on QPSK and 8QAM modulation schemes after 20- and 40-km transmission. We also give an estimation of the crosstalk induced by splices and by the few-mode fiber in our system.

Mode coupling at connectors in mode-division multiplexed transmission over few-mode fiber

In mode-division multiplexed (MDM) transmission systems, mode coupling is responsible for inter-modal crosstalk. We consider the transmission of modulated signals over a few-mode fiber (FMF) having low mode coupling and large differential mode group delay in the presence of a non-ideal fiber connection responsible for extra mode coupling. In this context, we first analytically derive the coupling matrix of the multimode connector and we numerically study the dependence of the matrix coefficients as a function of the butt-joint connection characteristics. The numerical results are then validated through an experiment with a five-mode setup. Finally, through numerical simulations, we assess the impact of the connector on the signal quality investigating different receiver digital signal processing (DSP) schemes.

5-Mode amplifier with low modal crosstalk for spatial mode multiplexing transmission with low signal processing complexity

We build a 5-mode amplifier with low modal crosstalk. With this amplifier we demonstrate, for the first time, an amplified transmission of 100Gbits/s signals over 80km of few mode fiber with low signal processing complexity.

A Five-Mode Erbium-Doped Fiber Amplifier for Mode-Division Multiplexing Transmission

We describe a few-mode erbium-doped fiber amplifier with ring-doped erbium doping profile fiber and optimized optical setup amplifying LP01, LP11, and LP21 modes, simultaneously. Spectral and modal gain distribution is characterized as well as modal crosstalk. We study the gain evolution of every mode in several configurations, changing the input power or the number of injected modes. The gain is above 13 dB for all modes and its differential modal gain is lower than 5.7 dB across the whole C-band with a 3.5-m-long erbium-doped fiber when using a pump at 630 mW. As a proof of concept, we transmit up to five modes carrying each a PDM-QPSK signal at 32 Gbd through this amplifier.

Six mode multi-plane light converter for mode-selective spatial multiplexing

We report a six mode spatial multiplexer with high efficiency and high mode selectivity, based on the technique of Multi-Plane Light Conversion (MPLC). Using this mode selective multiplexer, we demonstrate a total insertion loss in a six-mode fiber below 5 dB and a mode-to-mode selectivity greater than 20 dB over a broad wavelength range from 1530 to 1565 nm. Furthermore, this device can address any spatial mode profile of any few-mode fiber with high fidelity. This mode-multiplexer proves to be fully compatible with a wavelength- and space-division multiplexed optical transmission line.

3 Modes transmission using hybrid separation with high mode selectivity and low losses spatial mode multiplexer

We present a new spatial multiplexer based on a succession of transverse phases that limits modal crosstalk and injection loss. We demonstrate a three mode transmission experiment in 20km-long fiber using optical and digital mode separation.