Survey and Evaluation of Space Division Multiplexing: From Technologies to Optical Networks

Single-mode fiber's physical capacity boundaries will soon be reached; hence, alternative solutions are much needed to overcome the multiplying and remarkably large bandwidth requests. Space division multiplexing (SDM) using multicore fibers (MCFs), multielement fibers, multimode fibers, and their combination; few-mode MCFs; or fibers based on orbital angular momentum are considered to be the propitious stepping-stones to overcome the capacity crunch of conventional single-core fibers. We critically review research progress on SDM fibers and network components, and we introduce two figures of merit aiming for quantitative evaluation of technologies such as amplifiers, fan-in/fan-out multiplexers, transmitters, switches, and SDM nodes. Results show that SDM fibers achieve a 1185-fold (18-fold) spectral-spatial efficiency increase compared with the 276-SMF bundle (single-core fiber) currently installed on the ground. In addition, an analysis of crosstalk in MCFs shows how SDM concepts can be further exploited to fit in various optical networks such as core, metro, and especially future intra-data center optical interconnects. Finally, research challenges and future directions are discussed.

[1]  P. J. Winzer,et al.  Space-division multiplexing and all-optical MIMO demultiplexing using a photonic integrated circuit , 2012, OFC/NFOEC.

[2]  Kunimasa Saitoh,et al.  Multi-core fiber design and analysis , 2011, 2011 37th European Conference and Exhibition on Optical Communication.

[3]  Xiang Zhou,et al.  Hole-assisted few-mode multi-core fiber for high-density space-division multiplexing , 2012, 2012 IEEE Photonics Society Summer Topical Meeting Series.

[4]  A. Kar,et al.  57 channel (19×3) spatial multiplexer fabricated using direct laser inscription , 2014, OFC 2014.

[5]  I. Djordjevic,et al.  Dynamic multidimensional optical networking based on spatial and spectral processing. , 2012, Optics express.

[6]  T. Sasaki,et al.  Characterization of Crosstalk in Ultra-Low-Crosstalk Multi-Core Fiber , 2012, Journal of Lightwave Technology.

[7]  Peter J. Winzer,et al.  WDM/SDM transmission of 10 × 128-Gb/s PDM-QPSK over 2688-km 7-core fiber with a per-fiber net aggregate spectral-efficiency distance product of 40,320 kmb/s/Hz , 2011 .

[8]  B. Guan,et al.  A Six-Mode Erbium-Doped Fiber Amplifier , 2012 .

[9]  Peter M. Krummrich,et al.  Spatial multiplexing for high capacity transport , 2011 .

[10]  Yoshiteru Abe,et al.  1000-km 7-core fiber transmission of 10 x 96-Gb/s PDM-16QAM using Raman amplification with 6.5 W per fiber. , 2012, Optics express.

[11]  Tatsuhiko Watanabe,et al.  Over 300 channels uncoupled few-mode multi-core fiber for space division multiplexing , 2014, OFC 2014.

[12]  John M. Fini,et al.  Low-loss low-latency transmission over single-mode hollow core fiber at 10 and 120 Gb/s , 2014, OFC.

[13]  C. Schow,et al.  300-Gb/s 24-channel bidirectional Si carrier transceiver Optochip for board-level interconnects , 2008, 2008 58th Electronic Components and Technology Conference.

[14]  Haoshuo Chen,et al.  Silicon Photonic Integrated Mode Multiplexer and Demultiplexer , 2012, IEEE Photonics Technology Letters.

[15]  A. Gnauck,et al.  Space-division multiplexing over 10 km of three-mode fiber using coherent 6 × 6 MIMO processing , 2011, 2011 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference.

[16]  A. E. Korolev,et al.  Multicore fiber with rectangular cross-section. , 2014, Optics letters.

[17]  Ryo Nagase,et al.  Connection characteristics of MU-type multicore fiber connector , 2013, 2013 IEEE Photonics Society Summer Topical Meeting Series.

[18]  G. Bouwmans,et al.  Few mode Er 3+ -doped fiber with microstructured core enabling spectral and modal gain equalization for spatial division multiplexing , 2013 .

[19]  Robert W. Tkach.  Network traffic and system capacity: Scaling for the future , 2010, 36th European Conference and Exhibition on Optical Communication.

[20]  Yan Yan,et al.  Archon: A Function Programmable Optical Interconnect Architecture for Transparent Intra and Inter Data Center SDM/TDM/WDM Networking , 2015, Journal of Lightwave Technology.

[21]  B. Puttnam,et al.  OSNR Penalty of Self-Homodyne Coherent Detection in Spatial-Division-Multiplexing Systems , 2014, IEEE Photonics Technology Letters.

[22]  Toshio Morioka,et al.  1.01-Pb/s (12 SDM/222 WDM/456 Gb/s) Crosstalk-managed Transmission with 91.4-b/s/Hz Aggregate Spectral Efficiency , 2012 .

[23]  A. Gnauck,et al.  Mode-Division Multiplexing Over 96 km of Few-Mode Fiber Using Coherent 6 $\,\times\,$6 MIMO Processing , 2012, Journal of Lightwave Technology.

[24]  Ryuichi Sugizaki,et al.  Multicore EDFA for space division multiplexing by utilizing cladding-pumped technology , 2014, OFC 2014.

[25]  B. Guan,et al.  12 x 12 MIMO Transmission over 130-km Few-Mode Fiber , 2012 .

[26]  Naoya Wada,et al.  19-core MCF transmission system using EDFA with shared core pumping coupled via free-space optics. , 2014, Optics express.

[27]  K. Tsujikawa,et al.  Optical Fiber Amplifier Employing a Bundle of Reduced Cladding Erbium-Doped Fibers , 2012, IEEE Photonics Technology Letters.

[28]  E Hugues-Salas,et al.  Software defined networking (SDN) over space division multiplexing (SDM) optical networks: features, benefits and experimental demonstration. , 2014, Optics express.

[29]  Naoya Wada,et al.  SDM-WDM hybrid reconfigurable add-drop nodes for self-homodyne photonic networks , 2013, 2013 IEEE Photonics Society Summer Topical Meeting Series.

[30]  Ryuichi Sugizaki,et al.  Multicore EDFA for Space Division Multiplexing by Utilizing Cladding-pumped Technology , 2013 .

[31]  C. Schow,et al.  A 71-Gb/s NRZ Modulated 850-nm VCSEL-Based Optical Link , 2015, IEEE Photonics Technology Letters.

[32]  I. Giles,et al.  First demonstration of multimode amplifier for spatial division multiplexed transmission systems , 2011, 2011 37th European Conference and Exhibition on Optical Communication.

[33]  Manabu Arikawa,et al.  Reduction of influence of inter-core cross-talk in MCF with bidirectional assignment between neighboring cores , 2013, 2013 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference (OFC/NFOEC).

[34]  N. Wada,et al.  Realizing a 36-core, 3-mode fiber with 108 spatial channels , 2015, 2015 Optical Fiber Communications Conference and Exhibition (OFC).

[35]  K. Takenaga,et al.  Large Effective-Area Few-Mode Multicore Fiber , 2012, IEEE Photonics Technology Letters.

[36]  Jian Wang,et al.  Using orbital angular momentum modes for optical transmission , 2014, OFC 2014.

[37]  F. Huijskens,et al.  Ultra-high-density spatial division multiplexing with a few-mode multicore fibre , 2014, Nature Photonics.

[38]  T. Sakamoto,et al.  Six-LP-mode transmission fiber with DMD of less than 70 ps/km over C+L band , 2014, OFC 2014.

[39]  A D Ellis,et al.  73.7 Tb/s (96 x 3 x 256-Gb/s) mode-division-multiplexed DP-16QAM transmission with inline MM-EDFA. , 2012, Optics express.

[40]  K. Abedin,et al.  Multicore fiber distributed feedback lasers. , 2012, Optics letters.

[41]  D. Reid,et al.  Ultrafast laser inscription of a three dimensional fan-out device for multicore fiber coupling applications , 2008 .

[42]  Peter M. Krummrich.  Cost and energy efficient optical amplifiers for space division multiplexing , 2014, 2014 OptoElectronics and Communication Conference and Australian Conference on Optical Fibre Technology.

[43]  Kunimasa Saitoh,et al.  Analytical Expression of Average Power-Coupling Coefficients for Estimating Intercore Crosstalk in Multicore Fibers , 2012, IEEE Photonics Journal.

[44]  Dimitra Simeonidou,et al.  Routing, spectrum and core allocation in flexgrid SDM networks with multi-core fibers , 2014, 2014 International Conference on Optical Network Design and Modeling.

[45]  P. Sillard,et al.  Design and fabrication of weakly-coupled few-modes fibers , 2012, 2012 IEEE Photonics Society Summer Topical Meeting Series.

[46]  M. Koshiba,et al.  409-Tb/s + 409-Tb/s crosstalk suppressed bidirectional MCF transmission over 450 km using propagation-direction interleaving. , 2013, Optics express.

[47]  Neil J. A. Sloane,et al.  The encyclopedia of integer sequences , 1995 .

[48]  B. Eggleton,et al.  1×11 few-mode fiber wavelength selective switch using photonic lanterns , 2014, OFC 2014.

[49]  R Nejabati,et al.  Fully-elastic multi-granular network with space/frequency/time switching using multi-core fibres and programmable optical nodes. , 2013, Optics express.

[50]  Marco N. Petrovich,et al.  Ultra-high capacity transmission with few-mode silica and hollow-core photonic bandgap fibers , 2014, OFC 2014.

[51]  Naoya Wada,et al.  Investigating self-homodyne coherent detection in a 19-core spatial-division-multiplexed transmission link , 2012, 2012 38th European Conference and Exhibition on Optical Communications.

[52]  Periklis Petropoulos,et al.  First demonstration of an amplified transmission line based on multi-element fibre technology , 2013 .

[53]  B. Zhu,et al.  Spatial Superchannel Routing in a Two-Span ROADM System for Space Division Multiplexing , 2014, Journal of Lightwave Technology.

[54]  N. Fontaine,et al.  Spot-based mode coupler for mode-multiplexed transmission in few-mode fiber , 2012, 2012 IEEE Photonics Society Summer Topical Meeting Series.

[55]  Eric M. Monberg,et al.  Multicore Erbium Doped Fiber Amplifiers for Space Division Multiplexing Systems , 2014, Journal of Lightwave Technology.

[56]  Haoshuo Chen,et al.  30×30 MIMO transmission over 15 spatial modes , 2015, 2015 Optical Fiber Communications Conference and Exhibition (OFC).

[57]  B Zhu,et al.  Multimode transceiver for interfacing to multicore graded-index fiber capable of carrying 120-Gb/s over 100-m lengths , 2010, 2010 IEEE Photinic Society's 23rd Annual Meeting.

[58]  C. Serpa-Imbett,et al.  Performance of spatially multiplexed systems based on numerical simulations of OFDM-MIMO in a two-core fiber with low coupling, and a few mode fiber with high DGD , 2013, 2013 SBMO/IEEE MTT-S International Microwave & Optoelectronics Conference (IMOC).

[59]  T. Kawanishi,et al.  109-Tb/s (7×97×172-Gb/s SDM/WDM/PDM) QPSK transmission through 16.8-km homogeneous multi-core fiber , 2011, 2011 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference.

[60]  P. Winzer.  Energy-Efficient Optical Transport Capacity Scaling Through Spatial Multiplexing , 2011, IEEE Photonics Technology Letters.

[61]  Richard V. Penty,et al.  An introduction to InP-based generic integration technology , 2014 .

[62]  T. Hayashi,et al.  Uncoupled multi-core fiber enhancing signal-to-noise ratio. , 2012, Optics express.

[63]  John M. Fini,et al.  Low-loss low-latency transmission over single-mode hollow core fiber at 10 and 120 Gb/s , 2014, OFC 2014.

[64]  Maxim Kuschnerov,et al.  On the mode-dependent loss compensation for mode-division multiplexed systems , 2013, 2013 15th International Conference on Transparent Optical Networks (ICTON).

[65]  Hideki Tode,et al.  Routing, spectrum and core assignment for space division multiplexing elastic optical networks , 2014, 2014 16th International Telecommunications Network Strategy and Planning Symposium (Networks).

[66]  Ryo Nagase.  How to connect multicore and multimode fibers , 2014, OFC 2014.

[67]  Pierpaolo Boffi,et al.  Mode-division multiplexing in fibre-optic communications based on orbital angular momentum , 2013 .

[68]  N. Wada,et al.  Free-Space Coupling Optics for Multicore Fibers , 2012, IEEE Photonics Technology Letters.

[69]  A. Gnauck,et al.  Mode-Multiplexed Transmission Over a 209-km DGD-Compensated Hybrid Few-Mode Fiber Span , 2012, IEEE Photonics Technology Letters.

[70]  Knight,et al.  Single-Mode Photonic Band Gap Guidance of Light in Air. , 1999, Science.

[71]  T. Wilkinson,et al.  All Optical Mode-Multiplexing Using Holography and Multimode Fiber Couplers , 2012, Journal of Lightwave Technology.

[72]  P. Winzer,et al.  Capacity Limits of Optical Fiber Networks , 2010, Journal of Lightwave Technology.

[73]  P. M. Krummrich.  Optical amplifiers for multi mode / multi core transmission , 2012, OFC/NFOEC.

[74]  C. Schow,et al.  Terabit/Sec VCSEL-Based 48-Channel Optical Module Based on Holey CMOS Transceiver IC , 2013, Journal of Lightwave Technology.

[75]  J. Xu,et al.  Silicon Photonic Integrated Circuit Mode Multiplexer , 2013, IEEE Photonics Technology Letters.

[76]  T. Kobayashi,et al.  Low Loss Optical Connection Module for Seven-Core Multicore Fiber and Seven Single-Mode Fibers , 2012, IEEE Photonics Technology Letters.

[77]  Roberto Proietti,et al.  3D elastic optical networking in the temporal, spectral, and spatial domains , 2015, IEEE Communications Magazine.

[78]  René-Jean Essiambre,et al.  Capacity Trends and Limits of Optical Communication Networks , 2012, Proceedings of the IEEE.

[79]  B. Zhu,et al.  End-to-End Multicore Multimode Fiber Optic Link Operating up to 120 Gb/s , 2012, Journal of Lightwave Technology.

[80]  M. Koshiba,et al.  Trench-assisted low-crosstalk few-mode multicore fiber , 2013 .

[81]  A. Kar,et al.  Ultrafast laser inscription of an integrated multimode-to-single-modes waveguide transition for astrophotonics , 2011, 2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC).

[82]  A. Gnauck,et al.  Penalties from in-band crosstalk for advanced optical modulation formats , 2011, 2011 37th European Conference and Exhibition on Optical Communication.

[83]  F. Kish,et al.  Illinois Nano EP Seminar Series Fall 2011: Current Status of Coherent Large-Scale InP Photonic Integrated Circuits , 2011 .

[84]  B. Puttnam,et al.  305 Tb/s Space Division Multiplexed Transmission Using Homogeneous 19-Core Fiber , 2013, Journal of Lightwave Technology.

[85]  Maxim Kuschnerov,et al.  73.7 Tb/s (96X3x256-Gb/s) mode-division-multiplexed DP-16QAM transmission with inline MM-EDFA , 2012 .

[86]  S Berdagué,et al.  Mode division multiplexing in optical fibers. , 1982, Applied optics.

[87]  A. Willner,et al.  100 Tbit/s free-space data link using orbital angular momentum mode division multiplexing combined with wavelength division multiplexing , 2013, 2013 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference (OFC/NFOEC).

[88]  P. Petropoulos,et al.  Multi-element Fiber for space-division multiplexed optical communication system , 2014, 2014 16th International Conference on Transparent Optical Networks (ICTON).

[89]  Takehiro Tsuritani,et al.  114 space-division-multiplexed transmission over 9.8-km weakly-coupled-6-mode uncoupled-19-core fibers , 2015, 2015 Optical Fiber Communications Conference and Exhibition (OFC).

[90]  J. Kahn,et al.  Linear Propagation Effects in Mode-Division Multiplexing Systems , 2014, Journal of Lightwave Technology.

[91]  A. Dhar,et al.  Erbium-doped multi-element fiber amplifiers for space-division multiplexing operations. , 2013, Optics letters.

[92]  T. Tsuchizawa,et al.  Monolithic Integration of Silicon-, Germanium-, and Silica-Based Optical Devices for Telecommunications Applications , 2011, IEEE Journal of Selected Topics in Quantum Electronics.

[93]  Alexandros Stavdas.  Core and Metro Networks , 2010 .

[94]  S. Chandrasekhar,et al.  WDM/SDM transmission of 10 × 128-Gb/s PDM-QPSK over 2688-km 7-core fiber with a per-fiber net aggregate spectral-efficiency distance product of 40,320 kmb/s/Hz , 2011, 2011 37th European Conference and Exhibition on Optical Communication.

[95]  Maxim Kuschnerov,et al.  High Capacity Mode-Division Multiplexed Optical Transmission in a Novel 37-cell Hollow-Core Photonic Bandgap Fiber , 2014, Journal of Lightwave Technology.

[96]  Yusuke Sasaki,et al.  Large-effective-area ten-core fiber with cladding diameter of about 200 μm. , 2011, Optics letters.

[97]  M. Koshiba,et al.  Crosstalk and Core Density in Uncoupled Multicore Fibers , 2012, IEEE Photonics Technology Letters.

[98]  B. Puttnam,et al.  Investigating self-homodyne coherent detection in a 19 channel space-division-multiplexed transmission link. , 2013, Optics express.

[99]  N. Riesen,et al.  Ultra-Broadband Tapered Mode-Selective Couplers for Few-Mode Optical Fiber Networks , 2013 .

[100]  Hong Liu,et al.  The emerging optical data center , 2011, 2011 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference.

[101]  Takashi Sasaki,et al.  125-µm-cladding 8-core multi-core fiber realizing ultra-high-density cable suitable for O-band short-reach optical interconnects , 2015, 2015 Optical Fiber Communications Conference and Exhibition (OFC).

[102]  H. Tode,et al.  On-demand spectrum and core allocation for multi-core fibers in elastic optical network , 2013, 2013 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference (OFC/NFOEC).

[103]  T. Miyazaki,et al.  PSK self-homodyne detection using a pilot carrier for multibit/symbol transmission with inverse-RZ signal , 2005, IEEE Photonics Technology Letters.

[104]  T A Birks,et al.  Ultrafast laser inscription of a 121-waveguide fan-out for astrophotonics. , 2012, Optics letters.

[105]  Takashi Watanabe,et al.  Dynamic spectrum and core allocation with spectrum region reducing costs of building modules in AoD nodes , 2014, 2014 16th International Telecommunications Network Strategy and Planning Symposium (Networks).

[106]  Maxim Kuschnerov,et al.  Ultra-high capacity transmission with few-mode silica and hollow-core photonic bandgap fibers , 2014, OFC.

[107]  A. Willner,et al.  Terabit-Scale Orbital Angular Momentum Mode Division Multiplexing in Fibers , 2013, Science.

[108]  Siyuan Yu,et al.  Integrated Compact Optical Vortex Beam Emitters , 2012, Science.

[109]  T. Hayashi,et al.  Design and fabrication of ultra-low crosstalk and low-loss multi-core fiber. , 2011, Optics express.

[110]  Takenaga Katsuhiro,et al.  A large effective area multi-core fiber , 2011 .

[111]  Alexandros Stavdas.  Core and Metro Networks: Stavdas/Core and Metro Networks , 2010 .

[112]  J K Sahu,et al.  Multi-element fiber technology for space-division multiplexing applications. , 2014, Optics express.

[113]  K. Takenaga,et al.  Reduction of crosstalk by trench-assisted multi-core fiber , 2011, 2011 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference.

[114]  N. Wada,et al.  In-service method of path length alignment in SDM systems with self-homodyne detection , 2013, 2013 18th OptoElectronics and Communications Conference held jointly with 2013 International Conference on Photonics in Switching (OECC/PS).

[115]  P. Roberts,et al.  Ultimate low loss of hollow-core photonic crystal fibres. , 2005, Optics express.

[116]  L. Nelson,et al.  Space-division multiplexing in optical fibres , 2013, Nature Photonics.

[117]  Masahiko Jinno,et al.  Spectrally and spatially flexible optical network planning and operations , 2015, IEEE Communications Magazine.

[118]  J. Bowers,et al.  Hybrid Silicon Photonic Integrated Circuit Technology , 2013, IEEE Journal of Selected Topics in Quantum Electronics.

[119]  L Grüner-Nielsen,et al.  Field demonstration of mode-division multiplexing upgrade scenarios on commercial networks. , 2013, Optics express.

[120]  Ting Wang,et al.  Introduction of spectrally and spatially flexible optical networks , 2015, IEEE Communications Magazine.

[121]  Ming-Jun Li,et al.  Multicore fiber for optical interconnect applications , 2012, 2012 17th Opto-Electronics and Communications Conference.

[122]  F. Poletti,et al.  WDM transmission at 2µm over low-loss Hollow Core Photonic Bandgap Fiber , 2013, 2013 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference (OFC/NFOEC).

[123]  Hiroaki Harai,et al.  First demonstration of software defined networking (SDN) over space division multiplexing (SDM) optical networks , 2013 .

[124]  C. Kocot,et al.  A 56.1Gb/s NRZ modulated 850nm VCSEL-based optical link , 2013, 2013 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference (OFC/NFOEC).

[125]  Alexander V. Rylyakov,et al.  Exploring the limits of high-speed receivers for multimode VCSEL-based optical links , 2014, OFC 2014.

[126]  Dimitra Simeonidou,et al.  Flexible and synthetic SDM networks with multi-core-fibers implemented by programmable ROADMs , 2014, 2014 The European Conference on Optical Communication (ECOC).

[127]  A. Willner,et al.  Terabit free-space data transmission employing orbital angular momentum multiplexing , 2012, Nature Photonics.

[128]  Marco N. Petrovich,et al.  8 . 96 Tb / s ( 32 × 28 GBaud× 32 QAM ) Transmission over 0 . 95 km 19 cell Hollow-Core Photonic Bandgap Fiber , 2014 .

[129]  I. M. Jauncey,et al.  Low-noise erbium-doped fibre amplifier operating at 1.54μm , 1987 .

[130]  R. W. Tkach.  Can optical communications continue to meet the demand for bandwidth? , 2012, 2012 17th Opto-Electronics and Communications Conference.

[131]  K. Imamura,et al.  Multi-core few-mode optical fibers with large Aeff , 2012, 2012 38th European Conference and Exhibition on Optical Communications.

[132]  Yusuke Sasaki,et al.  Investigation of crosstalk dependencies on bending radius of heterogeneous multicore fiber , 2013, 2013 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference (OFC/NFOEC).

[133]  Dan M. Marom,et al.  Switching solutions for WDM-SDM optical networks , 2015, IEEE Communications Magazine.

[134]  N. Amaya,et al.  On-demand spectrum and space defragmentation in an elastic SDM/FDM/TDM network with mixed multi- and single-core fiber links , 2013, 2013 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference (OFC/NFOEC).

[135]  William Shieh,et al.  Reception of mode and polarization multiplexed 107-Gb/s CO-OFDM signal over a two-mode fiber , 2011, 2011 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference.

[136]  T. Wilkinson,et al.  Mode multiplexing at 2×20Gbps over 19-cell hollow-core photonic band gap fibre , 2012, OFC/NFOEC.

[137]  Lei Yan,et al.  Routing, Wavelength and Mode Assignment Algorithm for Space Division Multiplexing Transmission Network , 2012, 2012 Second International Conference on Instrumentation, Measurement, Computer, Communication and Control.

[138]  David J. Richardson,et al.  First demonstration of cladding pumped few-moded EDFA for mode division multiplexed transmission , 2014, OFC.

[139]  T F Taunay,et al.  Silicon Photonics Core-, Wavelength-, and Polarization-Diversity Receiver , 2011, IEEE Photonics Technology Letters.

[140]  Yang Yue,et al.  Orbital Angular Momentum (OAM) based Mode Division Multiplexing (MDM) over a Km-length Fiber , 2012 .

[141]  Dimitra Simeonidou,et al.  Introducing flexible and synthetic optical networking: planning and operation based on network function programmable ROADMs , 2014, IEEE/OSA Journal of Optical Communications and Networking.

[142]  Benjamin G Lee,et al.  Multichannel High-Bandwidth Coupling of Ultradense Silicon Photonic Waveguide Array to Standard-Pitch Fiber Array , 2011, Journal of Lightwave Technology.