Author Affiliations
Abstract
1 State Key Laboratory of Advanced Optical Communication Systems and Networks, Department of Electronics, Peking University, Beijing 100871, China
2 Frontiers Science Center for Nano-optoelectronics, Peking University, Beijing 100871, China
High-performance thin film lithium niobate (LN) electro-optic modulators with low cost are in demand. Based on photolithography and wet etching, we experimentally demonstrate a thin film LN Mach–Zehnder modulator with a 3 dB bandwidth exceeding 110 GHz, which shows the potential of boosting the throughput and reducing cost. The fabricated modulator also exhibits a comparable low half-wave voltage-length product of , a high extinction ratio of , and the propagation loss of optical waveguides of . Besides, six-level pulse amplitude modulation up to is successfully achieved.
lithium niobate electro-optic modulator high bandwidth photolithography wet etching Chinese Optics Letters
2022, 20(2): 022502
1 State Key Laboratory of Advanced Optical Communication Systems and Networks, Peking University, Beijing 100871, China
2 Wuhan Research Institute of Posts and Telecommunications, Wuhan 430074, China
Frontiers of Optoelectronics
2019, 12(1): 0131–40
Author Affiliations
Abstract
1 State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Electronics Engineering and Computer Science, Peking University, Beijing 100871, China
2 Peking University Shenzhen Institution, Shenzhen 518055, China
A wideband tunable optoelectronic oscillator (OEO) based on a tunable single-bandpass microwave photonic filter (MPF) and a recirculating delay line is proposed and experimentally demonstrated. The MPF is formed by cascading a finite impulse response filter and an infinite impulse response filter, which can enhance the quality factor of the MPF and suppress the side modes of the OEO. The frequency response of the tunable MPF is theoretically analyzed. By placing the MPF into the OEO, tunable microwave signals from 10.3 GHz to 26.7 GHz and a 100 MHz step tunability are experimentally demonstrated. The phase noise is 113 dBc/Hz@10 kHz. The results agree well with the theory.
060.5625 Radio frequency photonics 230.4910 Oscillators Chinese Optics Letters
2018, 16(11): 110602
北京大学 区域光纤通信网与新型光通信系统国家重点实验室, 北京 100871
针对弹性光网络中不同粒度业务之间的服务公平性问题，提出了公平性感知的动态频谱分配算法.通过引入一个新的效用函数，使得进行频谱分配时不仅考虑不同粒度业务间的服务公平性，而且还兼顾网络整体的频谱资源利用率，从而大大缓解了网络整体阻塞性能损伤.仿真结果表明，在动态网络环境下，该方案可以极大地提高弹性光网络中不同粒度业务之间的服务公平性，并且没有明显的阻塞性能恶化.
弹性光网络 路由频谱分配 服务公平性 带宽阻塞比 Elastic optical networks Routing and spectrum allocation Service fairness Bandwidth blocking ratio
Author Affiliations
Abstract
Enhancing resonance frequency of strong optical injection-locked semiconductor lasers is experimentally studied. Resonance frequency is increased from 4.1 to 53.9 GHz by the optical injection locking (OIL) technique. We experimentally demonstrate that resonance frequency is strictly equal to the frequency spacing between the cavity modes of the master and slave lasers under strong OIL condition. This result provides valuable information to improve OIL theory.
140.3520 Lasers, injection-locked 250.5960 Semiconductor lasers Chinese Optics Letters
2013, 11(12): 121403
Author Affiliations
Abstract
We propose a joint nonlinear electrical equalization approach in coherent optical discrete-Fourier-transform spread orthogonal-frequency-division-multiplexing (DFT-spread-OFDM) systems with polarization division multiplexing (PDM). This method is based on an adaptive Volterra series expansion for nonlinear distortions of two orthogonal polarizations. The nonlinear electrical equalization is validated through numerical simulation of 100-Gb/s quadrature phase shift keying and 200-Gb/s 16 quadrature amplitude modulation PDM DFT-spread-OFDM systems.
060.4370 Nonlinear optics, fibers 060.4510 Optical communications 060.4230 Multiplexing Chinese Optics Letters
2013, 11(6): 060601
Author Affiliations
Abstract
Orthogonal frequency division multiplexing-passive optical network (OFDM-PON) and single-carrier frequency division multiplexing (SCFDM)-PON are promising solutions for future high-speed PON-based access. A polarization division multiplexing scheme with direct detection is proposed for OFDM-PON to effectively reduce bandwidth requirements for components. However, the scheme strictly requires spectrum overlapping of two orthogonal sidebands and the 4×4 multi-input-multi-output (MIMO) algorithm to eliminate complex cross-polarization interference. In this letter, we propose a polarization interleaving (PI) approach that significantly reduces bandwidth requirements for optical and electrical components while achieving a high-flexibility and low-complexity MIMO algorithm. Downstream single sideband PI-SCFDM transmission is experimentally demonstrated.
060.2330 Fiber optics communications 060.4250 Networks Chinese Optics Letters
2012, 10(12): 120602
Author Affiliations
Abstract
We demonstrate the long distance transmission of single-carrier frequency division multiple address signals by directly-modulated optically injection-locked vertical-cavity surface-emitting laser. Transmission distance as long as 50 km is achieved at 5 Gb/s (2.5 Gb/s for each user) through data pattern inversion and higher frequency response gain under optical injection locking.
140.3520 Lasers, injection-locked 250.7260 Vertical cavity surface emitting lasers Chinese Optics Letters
2012, 10(9): 091407
Author Affiliations
Abstract
State Key Laboratory of Advanced Optical Communication Systems and Networks, Peking University, Beijing 100871, China
A 60-GHz bidirectional radio-over-fiber (RoF) system using two-carrier-injected distributed feedback (DFB) laser is proposed and demonstrated to realize optical single sideband (SSB) modulation for downlink. An injection-locked Fabry-P′erot laser is also carried out to realize wavelength reuse in uplink. Transmission of 2.5 Gb/s on a 60-GHz carrier for downlink and 622-Mb/s baseband signal for uplink are both successfully demonstrated over 50-km single mode fiber without chromatic dispersion compensation.
单边带调制 光载无线通信 注入锁模 060.5625 Radio frequency photonics 060.4080 Modulation 060.2330 Fiber optics communications 060.2360 Fiber optics links and subsystems Chinese Optics Letters
2010, 8(11): 1040
Author Affiliations
Abstract
State Key Laboratory of Advanced Optical Communication Systems &
Schemes integrating inter-carrier interference (ICI) self-cancellation and common phase error (CPE) compensation for coherent optical orthogonal frequency division multiplexing (CO-OFDM) systems are investigated. The purpose of our research is to counteract the impacts of laser phase noise and fiber nonlinearity. We propose two ICI self-cancellation-based CO-OFDM schemes, and adopt a pilot-aided decision feedback (DFB) loop for CPE compensation. The proposed schemes are compared with conventional CO-OFDM schemes at the same spectral efficiency. Simulations show that our schemes can not only enhance laser linewidth tolerance of the CO-OFDM system, but also present strong robustness against fiber nonlinearity.
激光器相位噪声 光纤非线性 子载波间干扰 公共相位误差 相干式光正交频分复用 060.2330 Fiber optics communications 060.4080 Modulation 060.1660 Coherent communications Chinese Optics Letters
2010, 8(7): 634
