103,087 Hits in 3.9 sec

Behavioral similarity of dissipative solitons in an ultrafast fiber laser

Ying Yu, Cihang Kong, Bowen Li, Jiqiang Kang, Yu-Xuan Ren, Zhi-Chao Luo, Kenneth K. Y. Wong
2019 Optics Letters  
That is, the bidirectional dissipative solitons will always reveal similar spectral and temporal characteristics through common gain and loss modulation, even if the transient instability is involved.  ...  As a proof-of-concept application, the precise and flexible manipulation of multi-soliton patterns is demonstrated.  ...  for multi-soliton propagation, it could be possible to accurately design and manipulate multiple solitons with desirable temporal patterns by setting perturbation positions.  ... 
doi:10.1364/ol.44.004813 fatcat:a2mp3ba2dnc2no6unenbgxr7s4

Effect of Mode Coupling on Signal Processing Complexity in Mode-Division Multiplexing

Sercan Ö. Arik, Daulet Askarov, Joseph M. Kahn
2013 Journal of Lightwave Technology  
Mode-division multiplexing systems employ multi-input multi-output (MIMO) equalization to compensate for chromatic dispersion (CD), modal dispersion (MD) and modal crosstalk.  ...  , 2.2, 2.8 times higher for , 12, 20, 30 than for polarization-multiplexed systems in standard single-mode fiber .  ...  Multi-Input Multi-Output Equalizers and Temporal Memory Lengths In a coherent MDM receiver, after modal demultiplexing, a set of dual-quadrature homodyne downconverters yields a set of complex baseband  ... 
doi:10.1109/jlt.2012.2234083 fatcat:ghk2fvb3lnaepj4ruxzafrjlw4

Efficient Compression of Multi-View Video Exploiting Inter-View Dependencies Based on H.264/MPEG4-AVC

P. Merkle, K. Muller, A. Smolic, T. Wiegand
2006 2006 IEEE International Conference on Multimedia and Expo  
To handle the specific requirements of multi-view datasets, namely temporal and inter-view correlation, two main features of the coder are used: hierarchical B pictures for temporal dependencies and an  ...  Finally, coding results are shown for the proposed multi-view coder and compared to simulcast anchor and simulcast hierarchical B picture coding.  ...  Fig. 6 and Fig. 7) . The gain strongly depends on the original setting of the multi-camera arrangement, namely the temporal and inter-view correlation.  ... 
doi:10.1109/icme.2006.262881 dblp:conf/icmcs/MerkleMSW06 fatcat:shlan3liu5avplvzf2tg4xqv4m

All-fiber dual-wavelength mode-locked laser using a bend-induced-birefringence Lyot-filter as gain-tilt equalizer [article]

Yuanjun Zhu, Fulin Xiang, Lei Jin, Sze Yun Set, Shinji Yamashita
2019 arXiv   pre-print
The dual-wavelength output centers at 1532 and 1556 nm and it may simplify the set-up for dual-wavelength mode-locked laser.  ...  Lyot-filter emerges as a potential device for multi-wavelength generation application.  ...  Acknowledgements We are grateful for the support by JSPS Grant-in-Aid for Scientific Research (S) Grant Number 18H05238.  ... 
arXiv:1909.07772v1 fatcat:5wjasptsabgx7asig7zpcaxhbi

Temporal characterization of a multi-wavelength Brillouin–erbium fiber laser

Victor Lambin Iezzi, Thomas F S Büttner, Amirhossein Tehranchi, Sébastien Loranger, Irina V Kabakova, Benjamin J Eggleton, Raman Kashyap
2016 New Journal of Physics  
It is found that the power in each channel is highly unstable due to the excitation of several cavity modes for typical conditions of operation.  ...  This paper provides the first detailed temporal characterization of a multi-wavelength-Brillouinerbium fiber laser (MWBEFL) by measuring the optical intensity of the individual frequency channels with  ...  RK acknowledges support from the Canada Research Chairs program and the Natural Sciences and Engineering Research Council of Canada's Discovery Grants program.  ... 
doi:10.1088/1367-2630/18/5/055003 fatcat:khhwz5whjbauhhdpjb6stgdlyi

A Novel Receiver Algorithm For Coherent Underwater Acoustic Communications

Liang Zhao, Jianhua Ge
2011 Zenodo  
To reduce computational complexity and optimize the equalization algorithm, Time reversal (TR) channel estimation and combining is adopted to simplify multi-channel adaptive decision feedback equalizer  ...  In JIED scheme, the ADFE and decoder exchange soft information in an iterative manner, which can enhance the equalizer performance using decoding gain.  ...  That is multi-channel adaptive decision feedback equalizer (MC-ADFE) which is applied in [1] [2] represents a more general approach to spatial and temporal signal processing.  ... 
doi:10.5281/zenodo.1077221 fatcat:glnap5mrlvfgxctuejmxudz4zi

Multi-vortex laser enabling spatial and temporal encoding

Zhen Qiao, Zhenyu Wan, Guoqiang Xie, Jian Wang, Liejia Qian, Dianyuan Fan
2020 PhotoniX  
Temporally, the multi-vortex beams can be simultaneously self-mode-locked, and each vortex component carries pulses with GHz-level repetition rate.  ...  Utilizing these distinct spatial-temporal characteristics, we demonstrate that the multi-vortex laser can be spatially and temporally encoded for data transmission, showing the potential of the developed  ...  By spatially separating different vortex modes in gain medium, gain competitions among the vortex modes are avoided, thus multi-vortex beams can steadily oscillate and output from laser.  ... 
doi:10.1186/s43074-020-00013-x fatcat:gxksoh6mozbp3leihtcmi2fvnm

Nonlinear dynamics of current-modulated vertical-cavity surface-emitting lasers

A. Valle, L. Pesquera, S.I. Turovets, J.M. López
2002 Optics Communications  
and frequencies.  ...  Finally, we show that spontaneous emission noise increases the number of available channels in chaotic optical communication systems in which frequency division multiplexing with multi-transverse-mode  ...  Similar modal losses (s i p;mn ¼ s p ) and material gain for all modes have been assumed.  ... 
doi:10.1016/s0030-4018(02)01579-1 fatcat:ce4ac2v4wne2xbk537ckgvgnb4

Chrominance Compensation for Multi-View Video Coding

Min-Woo PARK, Jong-Tae PARK, Gwang-Hoon PARK, Doug-Young SUH
2009 IEICE transactions on information and systems  
For the range of low bit-rate, it is observed that average BD-PSNR gains for Y, U and V are 0.14 dB, 0.49 dB and 0.53 dB, respectively.  ...  The proposed method is applied to both 'INTER 16×16' and 'SKIP' modes in only anchor P-pictures.  ...  And the MVC coding scheme can exploit spatial (inter-view)-temporal correlations among multi-view video by using temporal prediction with hierarchical B-picture structure and inter-view prediction [1]  ... 
doi:10.1587/transinf.e92.d.353 fatcat:7ujo2wpmevdi7jl6oteq63na5m

Wide Bandwidth, Frequency Modulated Free Electron Laser [article]

L.T. Campbell, B.W.J. McNeil
2017 arXiv   pre-print
The system is described in the linear regime by a summation over exponential gain modes, allowing the amplification of multiple light frequencies simultaneously.  ...  This new, wide bandwidth mode of FEL operation scales well for X-ray generation and offers users a new form of high-power FEL output.  ...  However, the spatial, exponential modes (in s) are coupled, and result in a spatial gain modulation for each frequency mode.  ... 
arXiv:1706.01517v1 fatcat:gfdvlx5df5cn3mavb6llg6i5l4

Intermodal group velocity engineering for broadband nonlinear optics [article]

Jeff Demas, Lars Rishøj, Xiao Liu, Gautam Prabhakar, Siddharth Ramachandran
2018 arXiv   pre-print
We demonstrate group-velocity-tailored four-wave mixing between the LP_0,4 and LP_0,5 modes of a multi-mode fiber with unprecedented gain bandwidths (>60 nm at 1550 nm).  ...  Interest in the nonlinear properties of multi-mode optical waveguides has seen a recent resurgence on account of the large dimensionality afforded by the platform.  ...  Introduction Multi-mode optical fibers provide the ability to guide light while encoding spatial, in addition to traditional temporal and spectral, information.  ... 
arXiv:1806.02902v1 fatcat:zj7vy4khczhhtnvalow2dqxkaa

Fourier analysis of the spectral properties of multi-mode laser radiation

I. Velchev, J. Toulouse
2003 American Journal of Physics  
By using the fast Fourier transform, the spectral and temporal characteristics of multi-mode laser radiation are investigated for different levels of spectral phase coherence.  ...  The transition between continuous-wave and mode-locked regimes in lasers is also discussed.  ...  In conclusion, we have shown that the understanding of the interconnections between the spectral properties of the output radiation of a multi-mode laser and its temporal behavior can be aided by the use  ... 
doi:10.1119/1.1527030 fatcat:ru2z64oybbdc5awxdg2snwsy7m

Multi-channel low-frequency room equalization using perceptually motivated constrained optimization

Mihailo Kolundzija, Christof Faller, Martin Vetterli
2012 2012 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)  
Considering physical and psychoacoustical observations, we argue for the use of gain-limited, short, and well-localized equalization filters, with an additional delay for loudspeakers that help the equalized  ...  We consider the problem of multiple-loudspeaker low-frequency room equalization for a wide listening area, where the equalized loudspeaker is helped using the remaining ones.  ...  In [12] , Fielder proposed considering temporal masking as a criterion for time-domain distortions of equalization systems.  ... 
doi:10.1109/icassp.2012.6287934 dblp:conf/icassp/KolundzijaFV12 fatcat:s2tumjjxqvgdlggoynonmlxwg4

Harnessing a multi-dimensional fibre laser using genetic wavefront shaping

Xiaoming Wei, Joseph C. Jing, Yuecheng Shen, Lihong V. Wang
2020 Light: Science & Applications  
Systemically controlling coherent lightwave oscillation in multi-dimensional lasers, however, is challenging and has largely been unexplored; yet, it is crucial for both designing 3D coherent light fields  ...  for exploring multi-dimensional nonlinear dynamics and solitary waves that may enable new applications.  ...  Supplementary information is available for this paper at 10.1038/s41377-020-00383-8.  ... 
doi:10.1038/s41377-020-00383-8 pmid:32884678 pmcid:PMC7450085 fatcat:dbmdt2dsyza3jpad7rlw6iaseu

Macroblock-Based Adaptive In-Scale Prediction for Scalable Video Coding

Ruiqin Xiong, Jizheng Xu, Feng Wu, Shipeng Li
2007 2007 IEEE International Symposium on Circuits and Systems  
For quality and resolution combined scalability, the prediction from lower resolution layer is not always better than temporal prediction.  ...  Techniques for motion estimation and mode decision are also investigated. Experimental results demonstrate that the scheme proposed in this paper can outperform H.264/MPEG-4 SVC significantly.  ...  For the case with QCIF QP=20, the proposed scheme achieve significant gain (up to 1.5dB, average 0.7~1.0dB over a large bit-rate range) over JSVM6 and it is clear this gain is not due to multi-loop decoding  ... 
doi:10.1109/iscas.2007.378013 dblp:conf/iscas/XiongXWL07 fatcat:hg2amgesdbbz7dsm2fnuqgjgee
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