10Gb/s single user hybrid fiber-FSO-fiber system based on optical CDMA

2021 ◽  
Author(s):  
Fang Peng ◽  
zihua zheng ◽  
jianhua ji
Keyword(s):  
Optical Cdma ◽  
Hybrid Fiber ◽  
Fiber System ◽  
Single User

Radio-over-fiber system using fiber-grating-based optical CDMA with modified PN codes

2003 ◽  
Vol 15 (10) ◽  
pp. 1485-1487 ◽  
Author(s):  
Bong Kyu Kim ◽  
Sangjo Park ◽  
Yonghee Yeon ◽  
Byoung Whi Kim
Keyword(s):  
Radio Over Fiber ◽  
Optical Cdma ◽  
Fiber Grating ◽  
Fiber System ◽  
Radio Over Fiber System

Polypropylene composites obtained from self-reinforced hybrid fiber system

2015 ◽  
Vol 133 (15) ◽  
pp. n/a-n/a ◽  
Author(s):  
Jacek Andrzejewski ◽  
Nicole Tutak ◽  
Marek Szostak
Keyword(s):  
Hybrid Fiber ◽  
Fiber System ◽  
Polypropylene Composites

PERFORMANCE ANALYSIS OF SEVERAL QUASI-ORTHOGONAL CODES OPTICAL CDMA FOR RADIO-OVER-FIBER SYSTEM

2013 ◽  
Vol 37 (3) ◽  
pp. 415-426
Author(s):  
Chih-Ta Yen ◽  
Ing-Jr Ding ◽  
Cheng-Mu Tsai
Keyword(s):  
Multiple Access ◽  
Cross Correlation ◽  
Low Cost ◽  
Multiple Access Interference ◽  
Radio Over Fiber ◽  
Base Stations ◽  
Optical Cdma ◽  
Fiber System ◽  
Spectral Coding ◽  
Code Division Multiple

An optical code-division multiple-access (OCDMA) network for radio-over-fiber (RoF) transmissions was proposed. The network encoders/decoders (codecs) were structured based on arrayed-waveguide-grating (AWG) routers coded using modified prime codes (MPCs). In the proposed system, the lower in-phase cross correlation could reduce the beating noise, and in the proposed study, its performance was compared with that of a conventional system that uses M-sequence and Walsh-Hadamard codes. The performance of both systems was numerically evaluated by analyzing the effect of phase-induced-intensity noise (PIIN). The results showed that the new code families that had lower cross correlation can suppress the intensity of the noise and effectively cancel out the multiple-access interference (MAI) in balanced detection processes, which improved system performance. By using the proposed MPC-coded OCDMA ROF network codecs, each network required only two AWG routers to accomplish the spectral coding of radio base stations (RBSs) and the decoding of control stations (CSs), resulting in a simple and low-cost system. Therefore, it is possible to produce interference- and crosstalk-free optical CDMA systems for RoF transmissions.

Optical CDMA using 2-D codes: the optimal single-user detector

2001 ◽  
Vol 5 (4) ◽  
pp. 169-171 ◽  
Author(s):  
T.-W.F. Chang ◽  
E.H. Sargent
Keyword(s):  
Optical Cdma ◽  
Single User

scholarly journals Hybrid Fiber-Optic Sensing Integrating Brillouin Optical Time-Domain Analysis and Fiber Bragg Grating for Long-Range Two-Parameter Measurement

Sensors ◽  
2021 ◽  
Vol 21 (12) ◽  
pp. 4224
Author(s):  
Shien-Kuei Liaw ◽  
Chi-Wen Liao ◽  
Meng-Hsuan Tsai ◽  
Dong-Chang Li ◽  
Shu-Ming Yang ◽  
...  
Keyword(s):  
Time Domain ◽  
Fiber Optic ◽  
Single Mode ◽  
Time Domain Analysis ◽  
Domain Analysis ◽  
Sensing Element ◽  
Hybrid Fiber ◽  
Fiber System ◽  
Fiber Sensing ◽  
Optical Time

Distributed fiber sensing (DFS) can provide real-time signals and warnings. The entire length of fiber optic cable can act as a sensing element, but the accuracy is sometimes limited. On the other hand, point-to-point fiber sensing (PPFS) is usually implemented using one or more fiber Bragg gratings (FBGs) at specific positions along with the fiber for the monitoring of specific parameters (temperature, strain, pressure, and so on). However, the cost becomes expensive when the number of FBGs increases. A hybrid fiber sensing scheme is thus proposed, combining the advantages of DFS and PPFS. It is based on a Brillouin optical time-domain analysis (BOTDA) fiber system with additional FBGs embedded at certain positions where it is necessary to detect specific parameters. The hybrid fiber sensing system has the advantages of full sensing coverage at essential locations that need to be carefully monitored. In our work, the test results showed that the proposed system could achieve a sensing distance of 16 km with the single-mode fiber with a 2 m spatial resolution. For FBG parameter measurements, the temperature variation was 52 °C, from 25 °C to 77 °C, with a temperature sensitivity of 23 pm/°C, and the strain was from 0 to 400 µε, with a strain sensitivity of 0.975 pm/µε, respectively, using two FBGs.

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