Fast adaptive laser shaping based on multiple laser incoherent combining

L. Garcia1, O. Pinel1, P. Jian1, N. Barré1, L. Jaffrès1, J.-F. Morizur1, G. Labroille1

1 CAILabs

SPIE Photonics West LASE, 10097-3 (2017).

Abstract – We introduce a novel technique allowing simultaneous combining and reshaping of several non-coherent laser sources. This Multi-Plane Light Conversion technique is based on a passive, tailored and multi-reflective phase element which realizes intrinsically lossless unitary transforms. This approach is particularly suitable for multiple kilowatt laser beam shaping applied to improved material processing. We present experimental and simulations results of a beam combiner managing up to ten incoherent laser beams and achieving two different functions: one is power combining with an optimum output beam quality (M²), the other is the generation of an adaptive tailored beam.

 

665 and 947 b/s/Hz Ultra-highly Aggregate-Spectral-Efficient SDM/WDM Transmission over 6-Mode 19-Core Fibre Using DP-16QAM/64QAM Signals

D. Souma1, Y. Wakayama1, S. Beppu1, K. Igarashi1,2, K. Takeshima1, T. Tsuritani1, H. Taga1, I. Morita1, M. Suzuki1

1 KDDI R&D Laboratories, 2 Osaka University

European Conference on Optical Communications, Th.3.C.2 (2016).

Abstract – 665 and 947 b/s/Hz ultra-highly aggregate spectral-efficient SDM transmission over 9.8km 6-mode 19-core fibre has been successfully demonstrated using 5.7-GHz-spaced 5-Gbaud DP-16QAM/64QAM Nyquist WDM signals with pre-emphasis-based MDL compensation and cladding-pumped 6-mode pre-amplification.

 

Multi-Wavelength Multiplexer with Independent Mode Control Based on Multi-Plane Light Conversion

G. Labroille1, N. Barré1, P. Jian1, J.-F. Morizur1

1 CAILabs

European Conference on Optical Communication, W.4.P1.SC4.10 (2016).

Abstract – We report dual wavelength spatial multiplexers based on the technique of Multi-Plane Light Conversion, which have the capability of independently multiplexing signals at different wavelengths with high mode selectivity, enabling applications to FM-EDFA and PON over multi-mode fibers.

 

Mitigation of Fading Caused by Atmospheric Turbulence with FMF Coupling and Maximum Ratio Combining Used in 320-m Free-Space Optical Transmission of 10 Gb/s BPSK

M. Arikawa1, T. Ishikawa1, K. Hosokawa1, S. Takahashi1, Y. Ono1, T. Ito1

1 NEC Corporation

European Conference on Optical Communication, Th.2.P2.SC5.15 (2016).

Abstract – We experimentally demonstrated the sum of the six modes of FMF improved coupling efficiency by 6.5 dB for the optical beam impaired by 320-m open-air free-space transmission, and fading was suppressed by digital maximum ratio combining for 10 Gb/s BPSK.

 

Novel 6-Mode Fibre Amplifier with Large Erbium-Doped Area for Differential Modal Gain Minimization

Y. Wakayama1, K. Igarashi1,2, D. Souma1, H. Taga1, T. Tsuritani1

1 KDDI R&D Laboratories, 2 Osaka University

European Conference on Optical Communication, M.2.A.3 (2016).

Abstract – We demonstrate a cladding-pumped six-mode fibre amplifier with a widely erbium-doped distribution over the core for uniform overlap between spatial modes and the gain medium. The differential modal gain of less than 3.3 dB was achieved in the entire -band.

 

Core-pumped 10-Mode EDFA with Cascaded EDF Configuration

M. Wada1, T. Sakamoto1, S. Aozasa1, T. Morii1, K. Nakajima1

1 NTT Access Network Service Systems Laboratories

European Conference on Optical Communication, M.2.A.4 (2016).

Abstract – We experimentally demonstrate a 10-mode fibre amplifier consisting of EDFs with a step-and-ring erbium concentration profile. We achieve a low differential modal gain below 3.5 dB and a low noise figure (4.5-7.0 dB) with a core-pumped configuration in the C-band

 

Demonstration of Turbulence-Tolerant Free-Space Optical Communication Receiver Using Few-Mode-Fiber Coupling and Digital Combining

M. Arikawa1, T. Ishikawa1, K. Hosokawa1, S. Takahashi1, Y. Ono1, T. Ito1

1 NEC Corporation

IEEE Summer Topicals meeting, p158 (2016).

Abstract – We improved the coupling efficiency to the free-space optical receiver by using a few-mode fiber with the optical signal distorted with a turbulence emulator. We demonstrated digital maximum ratio combining over 10-Gb/s BPSK transmission mitigated fading, relaxing the required transmitted power by 5 dB.

 

Wavelength Selective Switch with Optimal Steering Element Utilization

N. Fontaine1, H. Chen1, B. Ercan1, R. Ryf1, G. Labroille2, N. Barré2, P. Jian2, J.-F. Morizur2, D. Neilson1

1 Nokia Bell Labs, 2 CAILabs

Optical Fiber Communication Conference, Th5A.6 (2016).

Abstract – We implement a free-space unitary transform inside a wavelength selective switch to produce rectangular shaped beams on the LCoS steering element. Compared to standard Gaussian illumination, the WSS can support 2x as many ports per pixel.

 

 

Intermediate Mode Interchange for Reduction of Differential Mode-Group Delay in Weakly-Coupled 6-Mode Fiber Transmission Line

Y. Wakayama1, D. Souma1, K. Igarashi1,2, H. Taga1, T. Tsuritani1

1 KDDI R&D Laboratories, 2 Osaka University

Optical Fiber Communication Conference, M3E.6 (2016).

Abstract – Intermediate mode interchange using low-crosstalk mode multiplexer/demultiplexer in a 6 mode-division multiplexed transmission line has been demonstrated. We experimentally confirmed the reduction of differential mode group delay and tap size in 12×12 MIMO.

 

4 x 50 Gb/s transmission over 4.4 km of multimode OM2 fiber with direct detection using mode group multiplexing

C. Simonneau1, A. D’amoto1, P. Jian2, G. Labroille2, J.-F. Morizur2, G. Charlet1

1 Alcatel-Lucent Bell Labs, 2 CAILabs

Optical Fiber Communication Conference, Tu2J.3 (2016).

Abstract – We demonstrate 4x50Gb/s bidirectional transmission (100Gb/s in each direction) over 4.4km of OM2 fiber with direct detection and a selective excitation of 4 mode groups thanks to mode group multiplexers based on Multi-Plane Light Conversion.

 

Mode Selective 10-Mode Multiplexer based on Multi-Plane Light Conversion

G. Labroille1, P. Jian1, N. Barré1, B. Denolle1, J.-F. Morizur1

1 CAILabs

Optical Fiber Communication Conference, Th3E.5 (2016).

Abstract – We report a 10 spatial mode multiplexer based on the technique of Multi-Plane Light Conversion. The device shows average 4.4 dB insertion loss and 21 dB mode selectivity across the full C+L-band.

 

Amplification sharing of non-degenerate modes in an elliptical-core few-mode erbium-doped fiber

J.-B. Trinel1, Y. Quiquempois1, A. Le Rouge1, G. Le Cocq1, L. Garcia2, J.-F. Morizur2, G. Labroille2, L. Bigot1

1 PhLAM/IRCICA, 2 CAILabs

Optics Express 24, 4654 (2016).

Abstract – We report on the study of a possible first step integration of mode division multiplexed optical component for single-mode fiber networks. State-of-the-art on few-mode erbium-doped fiber amplifiers is used to integrate the amplification function in a single component, which is expected to save energy in comparison to parallelized active components. So as to limit the impact of modal cross-talk, an elliptical-core few-mode erbium-doped fiber has been used to assemble an amplifier sharing setup for different single mode fibers, using non-degenerate modes. With this simple setup, we show the level of performances that can be reached for cross-talk, gain, differential modal gain and losses and discuss the ways to improve them for a possible integration in a real network.

 

2.05 Peta-bit/s Super-Nyquist-WDM SDM Transmission Using 9.8-km 6-mode 19-core Fiber in Full C band

D. Souma1, K. Igarashi1,2, Y. Wakayama1, K. Takeshima1, Y. Kawaguchi1, N. Yoshikane1, T. Tsuritani1, I. Morita1, M. Suzuki1

1 KDDI R&D Laboratories, 2 Osaka University

European Conference on Optical Communications, PDP.3.2 (2015).

Abstract – We demonstrate ultra-dense SDM transmission of 360-channel Super-Nyquist-WDM DPQPSK signals over 9.8-km 6-mode 19-core fiber, achieving the record fiber capacity of 2.05 Pbit/s (360WDMx114SDMx50Gbit/s) with the highest aggregate spectral efficiency of 456 bit/s/Hz.

 

Optical Amplifier Sharing for Single Mode Fibers: Amplification of 5 non-degenerate Modes in an Elliptical-Core FM-EDFA

J.-B. Trinel1, Y. Quiquempois1, A. Le Rouge1, L. Garcia2, J.-F. Morizur2, G. Labroille2, L. Bigot1

1 PhLAM/IRCICA, 2 CAILabs

European Conference on Optical Communications, We.2.4.3 (2015).

Abstract – In this paper we investigate a possible first step upgrade for long-haul optical communications, before Spatial Division Multiplexing is fully ready. State-of-the-art on few-mode EDFA is sued to integrate amplification function in a single system.

 

30 Gbit/s Transmission over 1 km of Conventional Multi-mode Fiber using Mode Group Multiplexing with OOK modulation and direct detection

G. Labroille1, P. Jian1, L. Garcia1, J.-B. Trinel2, R. Kassi3, L. Bigot2, J.-F. Morizur1

1 CAILabs, 2 PhLAM/IRCICA, 3 IEMN/IRCICA

European Conference on Optical Communications, P.5.12 (2015).

Abstract – We demonstrate a 3×10 Gbit/s transmission with BER below 1E-11 over 1 km of conventional graded-index multi-mode fiber using OOK modulation and direct detection. Reach and capacity boosts are enabled by selective mode-group multiplexing based on Multi-Plane Light Converters in 3 full mode groups of an OM2 fiber.

 

114 Space-Division-Multiplexed Transmission over 9.8-km Weakly-Coupled-6-Mode Uncoupled-19-Core Fibers

K. Igarashi1,2, D. Souma1, Y. Wakayama1, K. Takeshima1, Y. Kawaguchi1, T. Tsuritani1, I. Morita1, M. Suzuki1

1 KDDI R&D Laboratories, 2 Osaka University

Optical Fiber Communication Conference, Th5C.4 (2015).

Abstract – We present space-division multiplexed transmission with spatial multiplicity over 100 using weakly-coupled-6-mode uncoupled-19-core fiber. Suppressing mode coupling and core-tocore crosstalk, MIMO complexity can be reduced. The record aggregate spectral efficiency over 345 bit/s/Hz is achieved.

 

6-mode Spatial Multiplexer with Low Loss and High Selectivity for Transmission over Few Mode Fiber

P. Genevaux1, C. Simonneau1, G. Labroille2, B. Denolle2, O. Pinel2, P. Jian2, J.-F. Morizur2, G. Charlet1

1 Alcatel-Lucent Bell Labs, 2 CAILabs

Optical Fiber Communication Conference, W1A.5 (2015).

Abstract – 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.

 

Amplification of 5 modes carrying each 100Gb/s with a few mode EDFA

P. Genevaux1, C. Simonneau1, G. Le Cocq2, Y. Quiquempois2, L. Bigot2, J.-F. Morizur3, G. Charlet1

1 Alcatel-Lucent Bell Labs, 2 Phlam, 3 CAILabs

Optical Fiber Communication Conference, Tu3C.5 (2015).

Abstract – We built an optical Few Mode Amplifier supporting 5 modes. Careful design and characterization enable us to obtain moderate crosstalk for all modes. Simultaneous amplification of 100Gbits/ PDM-QPSK signal over 5 modes is demonstrated

 

 

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

J.-F. Morizur1, P. Jian1, B. Denolle1, N. Barré1, G. Labroille1

1 CAILabs

Optical Fiber Communication Conference Invited talk, W1A.4 (2015).

Abstract – We report on a 6-mode spatial multiplexer based on multi-plane light conversion with 4.6dB insertion loss and −23dB mode-to-mode crosstalk, designed for few-mode fibre transmission systems that do not rely on complex electronic post-processing.

 

 

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

P. Jian1, G. Labroille1, B. Denolle1, P. Genevaux2, N. Barré1, O. Pinel1, J.-F. Morizur1

1 CAILabs, 2 Alcatel-Lucent Bell Labs

SPIE Photonics West Proceedings, 93890A (2015).

Abstract – 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-divisionmultiplexed optical transmission line.

 

 

A High Mode Selectivity and Low Losses Spatial Mode Multiplexer for Transmission using Hybrid Separation

P. Genevaux1, G. Labroille2, J.-F. Morizur2, C. Simonneau1, G. Campbell3, P.-K. Lam3, N. Treps4, P. Brindel1, R. Rios-Muller1, J. Renaudier1, M. Salsi1, G. Charlet1

1 Alcatel-Lucent Bell Labs, 2 CAILabs, 3 Australian National University, 4 Laboratoire Kastler Brossel

European Conference on Optical Communications, We.1.1.5. (2014).

Abstract – 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.

 

 

Efficient and mode selective spatial mode multiplexer based on Multi-Plane Light Conversion

G. Labroille1, B. Denolle1, P. Jian1, P. Genevaux2, N. Treps1,3, J.-F. Morizur1

1 CAILabs, 2 Alcatel-Lucent Bell Labs, 3 Laboratoire Kastler Brossel

Optics Express 22, 15599 (2014).

Abstract – We designed and built a new type of spatial mode multiplexer, based on Multi-Plane Light Conversion (MPLC), with very low intrinsic loss and high mode selectivity. In this first demonstration we show that a typical 3-mode multiplexer achieves a mode selectivity better than −23 dB and a total insertion efficiency of −4.1 dB (optical coating improvements could increase efficiency to −2.4 dB), across the full C-band. Moreover this multiplexer is able to perform any mode conversion, and we demonstrate its performance for the first 6 eigenmodes of a few-mode fiber: LP01, LP11a, LP11b, LP02, LP21a and LP21b.

 

 

Spatial reshaping of a squeezed state of light

J.-F. Morizur1,2, S. Armstrong1, N. Treps2, J. Janousek1, H.-A. Bachor1

1 Australian National University, 2 Laboratoire Kastler Brossel, 3 University of Queensland

The European Physical Journal D 61, 237 (2011).

Abstract – Reshaping the spatial profile, or mode, of a quantum state of light is one of the challenges in many quantum optics applications. We test the noise properties of a universal programmable mode converter and demonstrate that it can reshape the spatial mode of a beam while retaining its quantum properties. No detectable amount of noise is added to the light and only the standard transmission losses through conventional optical elements are found to affect the non-classical nature of the transformed light.

 

 

Programmable unitary spatial mode manipulation

J.-F. Morizur1,2, L. Nicholls1, P. Jian2, S. Armstrong1, N. Treps2, B. Hage1, M. Hsu3, W. Bowen3, J. Janousek1, H.-A. Bachor1

1 Australian National University, 2 Laboratoire Kastler Brossel

Journal of the Optical Society of America A 27, 2524 (2010).

Abstract – Free space propagation and conventional optical systems such as lenses and mirrors all perform spatial uni- tary transforms. However, the subset of transforms available through these conventional systems is limited in scope. We present here a unitary programmable mode converter (UPMC) capable of performing any spatial unitary transform of the light field. It is based on a succession of reflections on programmable deformable mir- rors and free space propagation.We first show theoretically that a UPMC without limitations on resources can perform perfectly any transform.We then build an experimental implementation of the UPMC and show that, even when limited to three reflections on an array of 12 pixels, the UPMC is capable of performing single mode tranforms with an efficiency greater than 80% for the first four modes of the transverse electromagnetic basis.