排序方式: 共有22条查询结果,搜索用时 15 毫秒
1.
2.
Performance improvement of 10-Gb/s XGM wavelength conversion by using polarization control structure
By utilizing the cross polarization modulation effect in semiconductor optical amplifier(SOA), the extinc tion ratio of cross gain modulation(XGM)wavelength conversion was enhanced, the pattern effect was significantly reduced,and the power penalty of wavelength conversion was reduced by 5 dB simultane-ously. Furthermore, by adjusting the settings of polarization controllers, both inverted and non-inverted wavelength conversion can be achieved right in the same wavelength converter. 相似文献
3.
本文报道一种光电混合集成的有源双稳态器件,它仅由一只半导体激光器,两只PIN光电探测器及几只电子元器件构成.实验上得到了光学迟滞回线,显示了光开关、光存储、光脉冲整形等功能.文中简述了器件工作原理,光电混合集成制作工艺技术及性能指标. 相似文献
4.
5.
我们着重研究了高压H2气Q(1)振动跃迁(4155cm-1)受激喇曼散射(SRS)中,参与非线性相互作用的几个参数(介质分子密度、跃迁线宽、泵浦光子密度以及非线性作用长度)对受激阈值与能量转换效率的影响。给出了自零到24atmH2气压范围内阈值随H2气压变化的实验结果,它与根据Dicke-Doppler展宽和碰撞展宽的联合效应的分析是一致的。讨论了由于受激喇曼过程(SRP)和四波混频参量过程(FWPP)共同影响下能量转换效率、压力-色散效应对高阶反斯托克斯的能量输出的重要影响。
关键词: 相似文献
6.
7.
<正>A cost-effective method of multi-receiver optical orthogonal frequency-division multiplexing(OOFDM) system is proposed to reduce the requirement for the speed of the receiver and the size of fast Fourier transform(FFT).The sampling rate of analog-to-digital converters(ADCs) can be reduced to 1/N of the original signal bandwidth in an N-receiver system.Aided by signal predistortion at the transmitter, aliasing-free signal can be retrieved independently and directly at the low speed receivers.A back-to-back experimental result is given for a two-receiver system.The effect of the electrical filters added before the ADC is studied and the analysis for filters optimization is given. 相似文献
8.
All-Optical AND Logic Gate without Additional Input Beam by Utilizing Cross Polarization Modulation Effect 下载免费PDF全文
A novel design of all-optical AND gate is proposed by using cross polarization modulation effect in a semiconductor optical amplifier. In this scheme, an additional continuous-wave beam is not required as that in traditional scheme. AND output is obtained on either of two input signal wavelengths. The AND scheme is numerically simulated and experimentally demonstrated at a bit rate of 10 Gb/s successfully. 相似文献
9.
A method of multi-channel receiving for high bit rate heterodyne direct-detection optical orthogonal frequency-division-multiplexing (OOFDM) system is proposed to reduce the sampling rate demand of analog-to-digital converter (ADC). The sampling rate of ADCs can be reduced to 1/N that of the original signal bandwidth in an N-channel receiving system. Aided by a succeeding digital signal processing (DSP) at the receiver, aliasing free signal can be recovered. A back-to-back experimental result is given for a 4-channel system, based on which, a down conversion process for heterodyne can be reduced. The signal rebuilding algorithm is given and analyzed in its complexity and noise tolerance. 相似文献
10.
A Step—by—Step Tunable Compound External Cavity Semiconductor Laser with Two—Side Feedback Coupling 下载免费PDF全文
A kind of compound external cavity semiconductor lasers(CECSL) is presented,by which laser with a discretely tunable wavelength can be obtained to meet the potential demands of the wavelength division multiplexing system.By the introduction of two-side feedback coupling in the CECSL,the CeCSL can operate more efficiently,and its side-mode suppression ratio is high up to 50dB. 相似文献