Demonstration of reconfigurable O-CDMA using liquid crystal modulators

Xia, Xiaowei; Ewing, Teresa K.; Serati, Steven A.; Fu, Yan; Zhou, Rong; Neff, John A.; Barnes, Frank S.

doi:10.1117/12.509153

Cited by 3 publications

(3 citation statements)

References 11 publications

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“…[1][2][3][4][5][6][7] With the rapid development of information era, spatial light modulators are expected to promote the performance improvement of products including unmanned aerial vehicles, micro-satellites, and optical broadband networks. [8][9][10][11][12][13] Spatial light modulators can modulate the light intensity, phase, and polarization. [14][15][16][17][18] Spatial light modulators can be divided into reflective and transmissive modes according to the different ways of reading out light.…”

Section: Introductionmentioning

confidence: 99%

Low insertion loss silicon-based spatial light modulator with high reflective materials outside Fabry–Perot cavity*

Tian¹,

Kuang²,

Zhang³

et al. 2019

Chinese Phys. B

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The extinction ratio and insertion loss of spatial light modulator are subject to the material problem, thus limiting its applications. One reflection-type silicon-based spatial light modulator with high reflective materials outside the Fabry–Perot cavity is demonstrated in this paper. The reflectivity values of the outside-cavity materials with different film layer numbers are simulated. The reflectivity values of 6-pair Ta2O5/SiO2 films at 1550 nm are experimentally verified to be as high as 99.9%. The surfaces of 6-pair Ta2O5/SiO2 films are smooth: their root-mean-square roughness values are as small as 0.53 nm. The insertion loss of the device at 1550 nm is only 1.2 dB. The high extinction ratio of the device at 1550 nm and 11 V is achieved to be 29.7 dB. The spatial light modulator has a high extinction ratio and low insertion loss for applications.

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Section: Introductionmentioning

confidence: 99%

Low insertion loss silicon-based spatial light modulator with high reflective materials outside Fabry–Perot cavity*

Tian¹,

Kuang²,

Zhang³

et al. 2019

Chinese Phys. B

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“…We used the phase delay characteristics of LC-SLM to construct the LC-SLM encoder/decoder. [15][16][17][18][19][20][21] The LC-SLM can change phase from 0 to 2³ effectively and can be used with a polarizer to develop SAC-OCDMA technology. 15) The research scheme used in this study is based on the light source of super luminescent diodes (SLDs) and is suitable for developing an OCDMA system.…”

Section: Introductionmentioning

confidence: 99%

“…[15][16][17][18][19][20][21] The LC-SLM can change phase from 0 to 2³ effectively and can be used with a polarizer to develop SAC-OCDMA technology. 15) The research scheme used in this study is based on the light source of super luminescent diodes (SLDs) and is suitable for developing an OCDMA system. We modified the configuration for fabricating a hybrid WDM/CDMA network [22][23][24][25] that is capable of MAI cancellation.…”

Section: Introductionmentioning

confidence: 99%

Constructing a two bands optical code-division multiple-access network of bipolar optical access codecs using Walsh-coded liquid crystal modulators

Yen¹,

Huang²,

Chih³

2014

Jpn. J. Appl. Phys.

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We propose and experimentally demonstrated the two bands optical code-division multiple-access (OCDMA) network over bipolar Walsh-coded liquid-crystal modulators (LCMs) and driven by green light and red light lasers. Achieving system performance depends on the construction of a decoder that implements a true bipolar correlation using only unipolar signals and intensity detection for each band. We took advantage of the phase delay characteristics of LCMs to construct a prototype optical coder/decoder (codec). Matched and unmatched Walsh signature codes were evaluated to detect correlations among multiuser data in the access network. By using LCMs, a red and green laser light source was spectrally encoded and the summed light dots were complementary decoded. Favorable contrast on auto- and cross-correlations indicates that binary information symbols can be properly recovered using a balanced photodetector.

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Liquid crystal modulated optical CDMA in a fiber-based testbed

Barnes

Ewing

et al. 2004

SPIE Proceedings

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Demonstration of reconfigurable O-CDMA using liquid crystal modulators

Cited by 3 publications

References 11 publications

Low insertion loss silicon-based spatial light modulator with high reflective materials outside Fabry–Perot cavity*

Low insertion loss silicon-based spatial light modulator with high reflective materials outside Fabry–Perot cavity*

Constructing a two bands optical code-division multiple-access network of bipolar optical access codecs using Walsh-coded liquid crystal modulators

Liquid crystal modulated optical CDMA in a fiber-based testbed

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