Title :
An eight-user time-slotted SPECTS O-CDMA testbed: demonstration and simulations
Author :
Scott, Ryan P. ; Cong, Wei ; Hernandez, Vincent J. ; Li, Kebin ; Kolner, Brian H. ; Heritage, Jonathan P. ; Yoo, S.J.B.
Author_Institution :
Dept. of Appl. Sci., Univ. of California, Davis, CA, USA
Abstract :
This paper demonstrates an eight-user 9 Gb/s/user time-slotted spectral phase-encoded time-spreading (SPECTS) optical code division multiple access (O-CDMA) testbed. Experimentally measured performance is compared to numerical simulations. The testbed employs a novel compact fiber-pigtailed bulk-optics setup that utilizes a single two-dimensional (2-D) phase modulator for encoding multiple channels, each with a unique 64-chip Walsh code. The time-gated receiver is composed of a nonlinear optical loop mirror (NOLM) and a nonlinear thresholder each utilizing a highly nonlinear fiber (HNLF) as the nonlinear element. The testbed operates error free with up to six users and at a bit error rate BER<10-9 for eight simultaneous users. Careful modeling of each component in the testbed allows a close match between simulated and experimentally measured testbed performance.
Keywords :
code division multiple access; error statistics; optical fibre communication; optical receivers; phase coding; phase modulation; BER; HNLF; NOLM; O-CDMA; SPECTS; Walsh code; bit error rate; highly nonlinear fiber; multiple channel encoding; nonlinear optical loop mirror; optical code division multiple access; phase modulator; spectral phase-encoded time-spreading; testbed; time-gated receiver; Bit error rate; Fiber nonlinear optics; Multiaccess communication; Nonlinear optics; Numerical simulation; Optical fiber testing; Optical modulation; Optical receivers; Phase modulation; Two dimensional displays; Access networks; multiaccess communication; nonlinear detection; optical code division multiple access; optical fiber communications;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2005.856263
