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国家自然科学基金(61006041)

作品数:10 被引量:9H指数:2
相关作者:陈刚张新平王宁李岩伍剑更多>>
相关机构:北京邮电大学更多>>
发文基金:国家自然科学基金国家重点基础研究发展计划国家高技术研究发展计划更多>>
相关领域:电子电信自动化与计算机技术化学工程更多>>

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10 条 记 录,以下是 1-9
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Half baudrate electrical clock based demultiplexing scheme for OTDM-DQPSK signal using SOA and optical filter
2012年
A demultiplexing scheme based on semiconductor optical amplifier(SOA)and optical filter for optical time division multiplexing differential quadrature phase shift keying(OTDM-DQPSK)system is proposed and investigated experimentally.With only a common half baudrate electrical clock modulated 33%duty cycle return-to-zero(RZ-33)optical clock signal as pump,this scheme is cost-effective,energy-efficient,and integration-potential.A proof-of-concept experiment is carried out for the demultiplexing of a 2×40-GBd OTDM-DQPSK signal.Error-free performance is demonstrated,and the average power penalty for both channels is about 3 dB.
王慧孔德明李岩张君毅伍剑林金桐
关键词:DEMULTIPLEXING
Simultaneous clock recovery and demultiplexing of a 320 Gb/s OTDM system using an optoelectronic oscillator based on cascaded MZM and PolM被引量:2
2013年
An improved optoelectronic oscillator scheme for an optical time division multiplexing (OTDM) system based on cascaded Mach-Zehnder modulator (MZM) and polarization modulator (PolM) is experimentally investigated. The system can simultaneously realize clock recovery and demultiplexing. With the MZM working at peak point to generate return-to-zero-33 optical pulses and the PolM working as an equivalent intensity modulator, a high-quality clock signal with 35-fs timing jitter is extracted from the 160-GBaud OTDM-differential quaternary phase-shift keying signal. Narrow short optical switch gates (4 ps) are also generated to demultiplex 160-GBaud signals to 40-GBaud signals. Error-free performance is achieved with 2.4-dB power penalty in the worst case.
稽誉贾锡学李岩伍剑林金桐
关键词:DEMULTIPLEXING
Photonic generation of high quality frequency-tunable millimeter wave and terahertz wave
2012年
A scheme for the photonic generation of frequency-tunable millimeter wave and terahertz wave signals based on a highly flat optical frequency comb is proposed and demonstrated experimentally.The frequency comb is generated using two cascaded phase modulators(PMs)and an electro-absorption modulator(EAM).The frequency comb covers a 440-GHz frequency range,with 40-GHz comb spacing and less than 2-dB amplitude variation.By filtering out two of the comb lines with 50 dB out of the band suppression ratio,high frequency-purity and low phase noise millimeter wave or terahertz wave signals are successfully generated,with frequencies ranging from 40 to 440 GHz.
嵇誉李岩张方正伍剑洪小斌徐坤李蔚林金桐
Design procedure for photonic crystal fibers with ultra-flattened chromatic dispersion被引量:2
2011年
A simple design procedure is used to generate photonic crystal fibers (PCFs) with ultra-flattened chromatic dispersion. Only four parameters are required, which not only considerably saves the computing time, but also distinctly reduces the air-hole quantity. The influence of the air-hole diameters of each ring of hexagonal PCFs (H-PCF, including 1-hole-missing and 7-hole-missing H-PCFs), circular PCFs (C-PCF), square PCFs (S-PCF), and octagonal PCFs (O-PCF) is investigated through simulations. Results show that regardless of the cross section structures of the PCFs, the 1st ring air-hole diameter has the greatest influence on the dispersion curve followed by that of the 2nd ring. The 3rd ring diameter only affects the dispersion curve within longer wavelengths, whereas the 4th and 5th rings have almost no influence on the dispersion curve. The hole-to-hole pitch between rings changes the dispersion curve as a whole. Based on the simulation results, a procedure is proposed to design PCFs with ultra-flattened dispersion. Through the adjustment of air-hole diameters of the inner three rings and hole-to-hole pitch, a flattened dispersion of 0±0.5 ps/(nm·km) within a wavelength range of 1.239 – 2.083 μm for 5-ring 1-hole-missing H-PCF, 1.248 – 1.992 μm for 5-ring C-PCF, 1.237 – 2.21 μm for 5-ring S-PCF, 1.149 – 1.926 μm for 5-ring O-PCF, and 1.294 – 1.663 μm for 7-hole-missing H-PCF is achieved.
徐惠真伍剑戴一堂徐聪林金桐
关键词:DISPERSIONS
相干偏振复用正交相移键控实时相干接收中的并行流水型恒模算法(英文)被引量:1
2014年
在对相干偏振复用四相相移键控信号进行偏振解复用的实时相干接收机中,为高效补偿偏振效应,同时降低系统对时钟频率要求与系统中FPGA资源的使用量,对接收机中广泛采用的恒模算法从并行性、滤波器阶数、以及流水性3方面进行了研究改进,提出了并行流水型恒模算法.研究结果显示,在43Gb/s高速相干接收系统中,相干接收机的并行度宜为32,滤波器阶数宜为5.VPI与MATLAB联合仿真结果表明,采用本文提出的并行流水型恒模算法后,基于FPGA的四相相移键控信号实时相干接收机对时钟频率的要求可以降低到168MHz;在不丢包的情况下,系统能够处理43Gb/s相干接收系统中的全部数据,有效实现偏振解复用;在背靠背情况下,补偿1×10-3误码率的OSNR为14.5dB.利用高层次综合软件将并行流水型恒模算法下载到FPGA中,DSP资源的使用量仅仅是传统算法使用量的1/8.
舒能李岩王宁张新平陈刚伍剑林金桐
关键词:恒模算法光纤通信系统
Pulsewidth-tunable CSRZ-DQPSK signal generation using DPMZMs
2012年
We show that absorbed and stored electromagnetic energy are proportional to the reflection group delay in highly reflective dispersive dielectric mirrors over the high-reflectivity band.Our theoretical considerations are verified by numerical simulations performed on different dielectric mirror structures.The revealed proportionality between group delay and absorbed energy sets constraint on the application of ultrabroadband and/or dispersive dielectric mirrors in broadband or widely tunable,high-power laser systems.
嵇誉李岩伍剑洪小斌徐坤李蔚林金桐
关键词:CSRZDQPSK
Novel high-sensitivity coherent transceiver for optical DPSK/DQPSK signals based on heterodyne detection and electrical delay interferometer被引量:3
2012年
We present a novel coherent transceiver for optical differential phase-shift keying/differential quadrature phase-shift keying (DPSK/DQPSK) signals based on heterodyne detection and electrical delay interferometer. A simulation framework is provided to predict a theoretical sensitivity level for the reported scheme. High sensitivity of –45.18 dBm is achieved for 2.5-Gb/s return-to-zero (RZ)-DPSK signal, and high sensitivities of –36.83 dBm (I tributary) and –35.90 dBm (Q tributary) are observed for 2.5-GBaud/s RZ-DQPSK signal in back-to-back configuration. Transmission for both signals over 100 km is also investigated. Experimental results are discussed and analyzed.
孔德明李岩伍霞王慧郭宏翔洪小斌左勇徐坤李蔚伍剑林金桐
关键词:HETERODYNINGTRANSCEIVERS
80-GB all-optical serial-to-parallel convertor for QPSK signal based on cascaded phase modulators and optical filters
2012年
An all-optical serial-to-parallel converter (SPC) utilizing two cascaded phase modulators and optical bandpass filters (OBPFs) is experimentally investigated and applied to demultiplex an 80-GBd optical timedivision multiplexing (OTDM) return-to-zero (RZ) differential quadrature phase-shift keying (QPSK) signal. Two 40-GBd OTDM tributaries are error-free demultiplexed with a power penalty of approximately 4 dB in the worst case. With its advantages of compact structure, high speed, low power penalty, simultaneous two-tributary operation, and no assistance from a light source, the SPC has potential for use in future OTDM networks. However, the performance of the SPC still needs imDrovement.
孔德明李岩王慧伍剑林金桐
All-optical integrated support for multicast and burst amplification in transparent optical network
2012年
A novel scalable and integrated design that supports optical multicast and burst amplification is proposed and demonstrated experimentally. The powers of incoming signals can be tuned to optimize the results of burst amplification and replication. Experimental results also show that erbium-doped optical Fiber amplication (EDFA) transients can be suppressed to an equally low level regardless of the burst parameters. Extended structure designs are further proposed to satisfy the need of mass replication of multicast signals.
曹孝元吴冰冰洪小斌伍剑林金桐
关键词:AMPLIFICATIONMULTICASTING
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