期刊文献+
共找到4篇文章
< 1 >
每页显示 20 50 100
A New Family of Optical Codes Based on Complementary Theory for OCDMA System
1
作者 Xing Chen Weixiao Meng 《Communications and Network》 2013年第3期176-180,共5页
A new family of optical codes for Optical Code-division Multiple Access (OCDMA) systems, named as Optical Complementary Codes (OCCs), is proposed in this paper. The constructions of these codes consist of multiple sub... A new family of optical codes for Optical Code-division Multiple Access (OCDMA) systems, named as Optical Complementary Codes (OCCs), is proposed in this paper. The constructions of these codes consist of multiple sub-codes, and the codes have an auto-correlation interference constraint as 0 and a cross-correlation interference constraint as 1. Compared with conventional optical codes such as OPCs, OOCs and 2-D OOCs, the OCC has a shorter code length and higher code efficiency with better correlation property. 展开更多
关键词 optical code-division Multiple Access (ocdma) COMPLEMENTARY Code
下载PDF
The Application of Optical CDMA-Based Fiber Radio Networks in Wireless Sensor Networks
2
作者 Chao-Chin YANG 《Wireless Sensor Network》 2009年第2期61-67,共7页
One fiber radio scheme using shifted prime codes for interference elimination is proposed for optical code-division multiple-access (OCDMA) network. By taking advantage of the cyclic property of the shifted prime code... One fiber radio scheme using shifted prime codes for interference elimination is proposed for optical code-division multiple-access (OCDMA) network. By taking advantage of the cyclic property of the shifted prime codes in the same code groups, the proposed compact decoder is low cost and suitable to be used in the task manager node in the applications of wireless sensor networks. The performance comparison for sev-eral OCDMA-based fiber radio networks is also given to clarify the advantage of the proposed one. 展开更多
关键词 optical code-division multiple-access (ocdma) Passive optical Network (PON) Arrayed Waveguide Grating (AWG) PRIME Code
下载PDF
ANALYSIS OF SPECTRAL PHASE ENCODING OCDMA SYSTEM WITH PSEUDORANDOM CODING 被引量:2
3
作者 张海滨 宋文涛 +1 位作者 黄培中 李荣玉 《Journal of Shanghai Jiaotong university(Science)》 EI 2002年第1期1-3,共3页
Multiple access interference (MAI) is the most serious interference in spectral phase encoding optical code division multiple access (SPE OCDMA) systems. This paper focuses on the behavior of MAI in SPE OCDMA systems ... Multiple access interference (MAI) is the most serious interference in spectral phase encoding optical code division multiple access (SPE OCDMA) systems. This paper focuses on the behavior of MAI in SPE OCDMA systems with pseudorandom coding. The statistical expectation of multi access interference (MAI) is derived and plotted. The results confirm that MAI can be suppressed effectively by pseudorandom coding with m sequences. 展开更多
关键词 optical code-division multiple-access (ocdma) SPECTRAL phase encoding M-SEQUENCES multiple-access inteference (MAI)
下载PDF
Tunable Super-Structured Fiber Bragg Gratings with Perfect Sequences Based on m-Sequence
4
作者 Joao S.Pereira Marco P.M.Ferreira Marko Gasparovic 《Journal of Electronic Science and Technology》 CAS CSCD 2017年第4期358-363,共6页
Recently, a tunable fiber Bragg grating(FBG) was developed by using stress-responsive colloidal crystals. In this paper, we have simulated the application of these nanoparticles into the super-structured fiber Bragg g... Recently, a tunable fiber Bragg grating(FBG) was developed by using stress-responsive colloidal crystals. In this paper, we have simulated the application of these nanoparticles into the super-structured fiber Bragg grating(SSFBG) written with perfect sequences derived from a short maximal-length sequence. A tunable SSFBG will be available to overcome the prohibitive temperature variation of the optical codecs. Nevertheless,we presented a method to implement coherent time spreading optical code-division multiple-access(OCDMA) where a unique code(or perfect sequence) can be reused and mixed with different wavelengths to obtain a tunable wavelength-division multiplexing(WDM)system. In order to maximize the binary throughput, we have selected a unique short maximal-length sequence composed of 7 chips that can be tuned with 7 different optical wavelengths. We found thousands of different tunable combinations that presented power contrast ratios(P/C) higher than 12 dB. When a WDM-OCDMA system used 2 different combinations simultaneously, the perfect binary detection with error correction codes was achieved successfully. The tunable SSFBG with colloidal crystals will be a simple and good alternative choice for fiber-to-the-home(FTTH) communications. 展开更多
关键词 optical code-division multiple-access(ocdma) super-structured fiber Bragg grating(SSFBG) wavelength-division multiplexing ocdma(WDM-ocdma)
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部