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Experimental performance evaluation of quadrature amplitude modulation signal transmission in a silicon microring

Chengcheng Gui and Jian Wang

Doc ID: 266576 Received 18 May 2016; Accepted 20 Jul 2016; Posted 22 Jul 2016  View: PDF

Abstract: We comprehensively characterize the transmission performance of m-ary quadrature amplitude modulation (m-QAM) signals through a silicon microring resonator in the experiment. Using orthogonal frequency-division multiplexing based on offset QAM (OFDM/OQAM) which is modulated with m-QAM modulations, we demonstrate low-penalty data transmission of OFDM/OQAM 64-QAM, 128-QAM, 256-QAM and 512-QAM signals in a silicon microring resonator. The observed optical signal-to-noise ratio (OSNR) penalties are 1.7 dB for 64-QAM, 1.7 dB for 128-QAM, 3.1 dB for 256-QAM at a bit-error rate (BER) of 2e-3 and 3.3 dB for 512-QAM at a BER of 2e-2. The performance degradation due to the wavelength detuning from the microring resonance is evaluated, showing a wavelength range of ~0.48 nm with BER below 2e-3. Moreover, we demonstrate data transmission of 191.2-Gbit/s simultaneous 8 wavelength channel OFDM/OQAM 256-QAM signals in a silicon microring resonator, achieving OSNR penalties less than 2 dB at a BER of 2e-2.

Multilayer black phosphorus as saturable absorber for Er:Lu₂O₃ laser at ~ 3 μm

Tao Li, Mingqi Fan, Shengzhi Zhao, Guiqiu Li, Xiaochun Gao, Kejian Yang, Dechun Li, and Christian Kraenkel

Doc ID: 269206 Received 24 Jun 2016; Accepted 20 Jul 2016; Posted 22 Jul 2016  View: PDF

Abstract: Multilayer black phosphorus (BP) nanoplatelets of different thicknesses were prepared by the liquid phase exfoliation method and deposited onto YAG substrates to form saturable absorbers (SAs). These were characterized with respect to their thickness-dependent saturable absorption properties at 3 μm. The BP-SAs were employed in a passively Q-switched Er:Lu₂O₃ laser at 2.84 μm. By using BP exfoliated in different solvents, stable pulses as short as 359 ns were generated at an average output power of up to 755 mW. The repetition rate in the experiment was 107 kHz, corresponding to a pulse energy of 7.1 μJ. These results prove that BP-SAs have a great potential for the generation of ultrashort pulses in the mid-IR range.

Orbital-angular-momentum-based reconfigurable optical switching and routing

Long Li, Alan Willner, Guodong Xie, Yongxiong Ren, Hao Huang, Yang Yue, Nisar Ahmed, Moshe Willner, Asher Willner, Yan Yan, Zhe Zhao, Zhe Wang, Cong Liu, Moshe Tur, and Solyman Ashrafi

Doc ID: 265330 Received 17 May 2016; Accepted 13 Jul 2016; Posted 18 Jul 2016  View: PDF

Abstract: Orbital angular momentum (OAM) has gained interest due to its potential to increase capacity in optical communication systems as well as an additional domain for reconfigurable networks. This is due to the following: (i) coaxially propagated OAM beams with different charges are mutually orthogonal, (ii) OAM beams can be efficiently multiplexed and demultiplexed, and (iii) OAM charges can be efficiently manipulated. Therefore, multiple data-carrying OAM beams could have the potential capability for reconfigurable optical switching and routing. In this paper, we discuss work involving reconfigurable OAM-based: optical add/drop multiplexing, space switching, polarization switching, channel hopping, and multicasting.

Modeling and optimization of a single-drive push-pull silicon Mach-Zehnder modulator

Linjie Zhou, Yanyang Zhou, haike zhu, Chi Yan Wong, Lei Liu, Xinwan Li, Jianping Chen, and yida wen

Doc ID: 260720 Received 08 Mar 2016; Accepted 30 Jun 2016; Posted 01 Jul 2016  View: PDF

Abstract: We present an equivalent circuit model for a silicon carrier-depletion single-drive push-pull Mach-Zehnder modulator (MZM) with its traveling wave electrode made of coplanar strip lines. In particular, the partial-capacitance technique and conformal mapping are used to derive the capacitance associated with each layer. The PN junction is accurately modeled with the fringe capacitances taken into consideration. The circuit model is validated by comparing the calculations with the simulation results. Using this model, we analyze the effect of several key parameters on the modulator performance to optimize the design. Experiment results on MZMs designed and fabricated accordingly confirm the theoretical analysis. A 56 Gb/s on-off keying modulation and a 40 Gb/s binary phase-shift keying modulation are achieved using the optimized modulator.

Influences of atmosphere turbulence effects on the orbital angular momentum spectra of vortex beams

Shiyao Fu and Chunqing Gao

Doc ID: 262979 Received 12 Apr 2016; Accepted 26 Jun 2016; Posted 27 Jun 2016  View: PDF

Abstract: We investigate the atmosphere turbulence effects on the orbital angular momentum (OAM) spectra of different kinds of vortex beams including Laguerre-Gaussian (LG) beams and Bessel beams numerically. We generate the holograms of atmosphere turbulence with different structure constant of the refractive index. The OAM spectra of distorted single mode or multiplexed LG beams and Bessel beams are analyzed. Compared the OAM spectra of the two kinds of vortex beams, the spectrum of the Bessel beams is more dispersive. The results illustrate that Bessel beams suffer more from turbulent atmosphere than LG beams. © 2016 Chinese Laser Press

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