Highcapacity Optical Communications Using OAMbased Space Division Multiplexing Yongxiong Ren yongxioruscedu Advisor Prof Alan E Willner Nov 18th 2016 Acknowledge my advisor Prof ID: 764387
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High-capacity Optical Communications Using OAM-based Space Division Multiplexing Yongxiong Ren (yongxior@usc.edu)Advisor: Prof. Alan. E WillnerNov. 18th 2016 Acknowledge my advisor Prof. Willner , my OCLab mates ( Guodong , Yan, Nisar , Long, Zhe , Yinwen , Joe, C. Bao , and LPC) and all collaborators.
Why Space Division Multiplexing? The current capacity of fiber link is mainly limited by the nonlinearity. The SDM could potentially provide the next big jump in transmission capacity, reaching Pbit/s scale transmission rate . D. Richardson et al, Nature Photonics 7, 354-362 (2013). 1Pb/s
My Research Work on Communications using OAM Beams Atmospheric turbulence effects on orbital angular momentum (OAM) beams Upgraded to CLEO 2013 InvitedTurbulence compensation of OAM beamsFiO 2014 postdeadline paperHigh-impact OSA journal: Optica 120-meter free-space optical link using OAM beam multiplexing on EEB building roof Top Scored Paper in OFC 2015 (1 out of ~100) Free-space communications using OAM multiplexing combined with conventional spatial multiplexing IEEE Globecom Best Paper Award
The number of possible states is infinite l = 0 Orbital Angular Momentum (OAM) Beams : Concept A. M. Yao et al, Adv. in Opt. & Phot ., 2011 Intensity Phase (OAM = +1) (OAM = 0) 3-D Wavefront Plane wave OAM beam OAM = +2
OAM= 1 OAM = 3OAM-based Space Division Multiplexing Free-space Laser beams with different OAM values are orthogonal and can be separated Data Channel 1 Data Channel 2 A bunch of rings that are overlapped spatially Data Channel 3 OAM = 2 Transmission capacity can be increased by the number of transmitted OAM modes.
OAM Applications − OAM Communications System results have been reported for up to 100 Tbit/s data transmission.Future application scenarios might include: back-haul, data center, building-to-building communications.Previous demonstrations: distance~1-meter on optical tables without atmospheric turbulence effects. H. Huang et al, Optics Letters 2013 J. Wang et al, Nature Photonics 2012
1. OAM Propagation in Free Space: Atmospheric Turbulence Atmospheric Turbulence Transmitted OAMDistorted OAM Power 𝓵 1 OAM Modes Power 𝓵 1 OAM Modes 𝓵 4 𝓵 2 𝓵 3 𝓵 5 OAM beam experiences turbulence-induced distortion, which results in power loss and channel crosstalk. The atmospheric turbulence is emulated in the lab environment by using rotating phase plates, obeying Kolmogorov spectrum statistics. Y. Ren , et al., Opt. Lett., 2014 Turbulence Emulator Rotating Phase Plate Y. Ren et al., CLEO 2013 (Invited)
2. Turbulence Compensation of OAM Beams Use Gaussian beam as a pilot beam to detect wavefront distortion of Gaussian beam with a conversional wavefront sensor. Conventional adaptive optics approach couldn’t work for OAM beam. Intensity singularity of OAM beam makes it difficult Y. Ren et al., Opt. Lett., 2014 Y. Ren, et al., Opt. Lett., 2015 Y. Ren et al., Optica , 2014
2. Experiment Results— Far Field Intensity By using the correction pattern obtained from a Gaussian probe beam in adaptive optical system, the distorted OAM beams up to OAM l= 9 are efficiently compensated. Y. Ren, et al., Opt. Lett., 2014 Before compensation After compensation
Two mirrors placed 30-m away are used to reflect the OAM beams twice, thus the link distance is 120-meter. Four OAM modes (ℓ = ±1, ±3), each carrying a 100-Gbit/s QPSK data channel are transmitted, thus allowing a total capacity of 400-Gbit/s. 3. Longer-distance Transmission using OAM Multiplexing Y. Ren, et al., OFC , 2015 (Top Scored)
4. OAM Multiplexing + Conventional Spatial Multiplexing (MIMO) System The system consists of N transmitter/receiver aperture pairs and each transmitter aperture contains M OAM modes, potentially providing N×M channels.The complexity of implementing N×M channels could be less compared to a pure OAM system or MIMO system, and the system performance could potentially be enhanced. MIMO: Multiple-input Multiple output Y. Ren, et al., IEEE Globecom 2015 Best Paper Award
Selected Publications 45 journal papers (including Science, Nat. Photonics, Nat. Communications, Optica and Scientific Reports ) and 67 conference proceedings Selected first-authored papers: 1. Y. Ren , et al., Scientific Reports , vol. 40, no. 18, pp. 4190-4193, 2016. 2. Y. Ren , et al., Optics Letters , vol. 40, no. 10, pp. 2249-2252, 2016. 3. Y. Ren, et al., Optica, vol. 1, no. 6, pp. 376-382, 2016.4 . Y. Ren, et al., Optics Letters, vol. 40, no. 18, pp. 4190-4193, 2015.5. Y. Ren, et al., Optics Letters, vol. 40, no. 10, pp. 2249-2252, 2015. 6. Y. Ren, et al., Optica, vol. 1, no. 6, pp. 376-382, 2014.7 . Y. Ren, et al., Optics Letters, vol. 39, no. 10, pp. 2845-2848, 2014.8. Y. Ren, et al., Optics Letters, vol. 38, no. 20, pp. 4062-4065, 2013. 9. Y. Ren , et al., OFC 2014. *Top scored paper*10 . Y. Ren, et al ., IEEE Globecom 2014. *2014 Globecom Best Paper Award*11. Y. Ren, et al., Frontiers in Optics (FiO) 2013. * FiO postdeadline paper 2013*12. Y. Ren, et al., Invited Paper, CLEO 2013. *Upgraded to invited status*
Thank You!!!! yongxior@usc.edu MHI Research Festival, Nov. 11th 2016