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国家高技术研究发展计划(2007AA01Z271)

作品数:7 被引量:7H指数:2
相关作者:张洪明傅鑫姚敏玉吴庆伟彭越更多>>
相关机构:清华大学更多>>
发文基金:国家自然科学基金国家高技术研究发展计划更多>>
相关领域:电子电信更多>>

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7 条 记 录,以下是 1-7
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SAC-OCDM/TDM system for upgrading the TDM PON
2011年
A spectral amplitude coded-optical code division multiplexing time division multiplexing (SAC- OCDM/TDM) passive optical network (PON) for upgrading the traditional TDM PON is proposed. To the best of our knowledge, our work is the first to report on the use of both spectral and orthogonal code domains, which are transparent to optical network unit (ONU) for hybrid PON, in order to upgrade TDM PON seamlessly. The fewer encoder/decoders and cheaper optical source under the conditions of high bite rate and large ONU accommodation make the system cost-effective. A downstream experiment is demonstrated, and the results demonstrate that the proposed system is feasible.
陈荷肖石林义理林董毅胡卫生
利用光纤挤压器实现的移相光模数转换器被引量:4
2010年
提出了一种新型移相光量化方案,利用光纤挤压器使光纤传输截面产生应力双折射,从而实现移相量化编码。在实验中实现了4 bit移相光量化器,用10 GHz重复频率采样脉冲对2.5 GHz正弦信号进行量化,获得量化结果的信噪比为23.9 dB,对应的有效比特位为3.68 bit。同已有的方案相比,此方案结构简单,只需要一个相位调制器,避免了多调制器工作输入信号的同步问题;利用光纤挤压器实现移相,控制精度高且成本低,可以实现高于6 bit的理论量化精度;并且可以通过光脉冲复用技术实现更高的采样速率。
彭越张洪明吴庆伟傅鑫姚敏玉
关键词:信号处理模数转换
Novel WDM-PON architecture for simultaneous transmission of unicast data and multicast services
2010年
We propose a novel wavelength-division multiplexed passive optical network (WDM-PON) to simultaneously transmit unicast data and multicast services with upstream data re-modulation in optical network units (ONUs). For each wavelength channel in the optical line terminal (OLT), the downstream unicast data are applied to one arm of a dual-parallel Mach-Zehnder modulator (DPMZM) to generate baseband unicast non-return-to-zero (NRZ) signal. A radio frequency (RF) control signal is applied to the other arm to present two un-modulated sidebands for multicast data modulation in a differential phase-shift keying (DPSK) format. The flexible and dynamic multicast services are realized by simply switching the RF control signal on or off. The proposed scheme is experimentally demonstrated with 1.25-Gb/s downstream unicast, multicast, and upstream data.
朱敏肖石林郭薇胡卫生Benoit Geller
关键词:MULTICASTING
基于时域交织多波长脉冲产生的光电混合ADC被引量:2
2010年
为了获得各个波长独立可调的、稳定的时域交织多波长超短脉冲序列,满足光电混合模数转换器(ADC)对采样脉冲源的需求,该文首次结合啁啾-色散脉冲压缩技术和高速光子开关技术来实现超短脉冲产生及多波长脉冲时域分离。在验证性实验中,4个密集波分复用(DWDM)标准波长的直流光源在经过强度和相位调制、光子开关以及色散模块后,产生了各个波长功率可独立调节的时域交织多波长光脉冲,脉宽约22 ps,有希望实现40 GS/s或更高采样率的光电混合ADC。在系统级测试中,使用这种方法产生的脉冲序列在完成待测信号的采样后,其无杂散动态范围(SFDR)超过32 dBc,等效于5.3 b的SFDR比特数(SFDR bits)。
傅鑫张洪明张圆成姚敏玉
关键词:激光技术超短光脉冲产生
基于双路采样非相干叠加的微波信号光量化技术被引量:1
2009年
改进了现有的基于强度调制型移相的微波光量化方案,新方案简化了系统结构,小再需要互补输出的强度调制器,显著提高了工作带宽,并进行了实验验证。新方案采用双路强度调制进行采样,通过调节2个可调光衰减器,对2路采样信号进行非相干叠加来实现系统中传输特性曲线的相移。实验演示了8通道(16个量化等级)的移相光量化系统,用20GHz重复频率的光脉冲对2.5 GHz的正弦信号进行量化,从量化值可以得到较好的正弦拟合曲线,证明了方案的可行性。
傅鑫张洪明姚敏玉
关键词:激光技术强度调制
Analysis of IPACT network performance considering channel switch latency for WDM-EPON
2011年
In wavelength-division multiplexing (WDM) ethernet passive optical networks (EPONs), to realize the statistical multiplexing of upstream wavelength resources, some optical tunable components are introduced in the optical network units. However, the switch latency (SL) of these tunable components constrains the performance of WDM-EPON. In this letter, we extend the mathematical model of the WDM interleaved polling with adaptive cycle time (IPACT) scheme by additionally considering the SL conditions. We also investigate the effect of channel SL on network performance. The simulation results show that the performance of WDM-IPACT-SL deteriorates as the SL increases.
周钊肖石林朱敏毕美华
关键词:ETHERNETETHERSMULTIPLEXING
Repetition rate tunable ultra-short optical pulse generation based on electrical pattern generator被引量:1
2009年
An actively mode-locked laser with tunable repetition rate is proposed and experimentally demonstrated based on a programmable electrical pattern generator. By changing the repetition rate of the electrical patterns applied on the in-cavity modulator, the repetition rate of the output optical pulse sequences changes accordingly while the pulse width of the optical pulse train remains almost constant. In other words, the output ultra-short pulse train has a tunable duty cycle. In a proof-of-principle experiment, optical pulses with repetition rates of 10, 5, 2.5 and 1.25 GHz are obtained by adjusting the electrical pattern applied on the in-cavity modulator while their pulse widths remain almost unchanged.
傅鑫张洪明燕萌姚敏玉
关键词:LASERSMODULATION
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