Results 51 to 60 of about 20,276,485 (162)

Advances in fibre based pulse shaping technology and its applications in optical communications [PDF]

, 2007
Fibre grating technology can be used to design and fabricate reflective filters with accurately controlled complex phase and amplitude responses and thereby provide a powerful means to reshape short optical pulses in both time and frequency.
Ibsen, M., Petropoulos, P., Parmigiani, F., Tian, C., Richardson, D.J., Almeida, P.J., Ng, T.T., Zhang, Z.   +7 more
core   +3 more sources

MAC Protocol Design for Optical Wireless Body‐Area Networks: Latency, Energy Efficiency and Scalability Analysis

IET Networks, Volume 15, Issue 1, January/December 2026.
This work investigates suitable MAC protocols for medical optical wireless body‐area networks (WBANs), focussing on multiple access management. Using realistic channel models, we evaluate the network performance in terms of energy efficiency, quality‐of‐service and scalability for different IEEE protocols, for both intra‐ and extra‐WBAN connectivity in
Christos Giachoudis, Mohammad‐Ali Khalighi, Stanislav Zvanovec, Vasilis K. Papanikolaou, Sotiris A. Tegos, George K. Karagiannidis   +5 more
wiley   +1 more source

Mathematical Verification for Transmission Performance of Centralized Lightwave WDM‐RoF‐PON with Quintuple Services Integrated in Each Wavelength Channel

Advances in OptoElectronics, Volume 2015, Issue 1, 2015., 2015
Wavelength‐division‐multiplexing passive‐optical‐network (WDM‐PON) has been recognized as a promising solution of the “last mile” access as well as multibroadband data services access for end users, and WDM‐RoF‐PON, which employs radio‐over‐fiber (RoF) technique in WDM‐PON, is even a more attractive approach for future broadband fiber and wireless ...
Shuai Chen, Wei Nai, Fangqi Zhang, Shaoyin Wang, Decun Dong, Yi Yu, Vasily Spirin   +6 more
wiley   +1 more source

Demonstration of a 64-chip OCDMA system using superstructured fiber gratings and time-gating detection [PDF]

, 2001
We investigate the benefits of using time-gating detection in an optical code-division multiple access (OCDMA) system that comprises bipolar 64-chip long superstructure fiber Bragg grating encoders and decoders. Transmission of the codes is demonstrated,
Teh, P.C., Ibsen, M., Kitayama, K.-I., Petropoulos, P., Wada, N., Richardson, D.J., Chujo, W.   +6 more
core   +1 more source

BER Analysis Using Beat Probability Method of 3D Optical CDMA Networks with Double Balanced Detection

Mathematical Problems in Engineering, Volume 2015, Issue 1, 2015., 2015
This study proposes novel three‐dimensional (3D) matrices of wavelength/time/spatial code for code‐division multiple‐access (OCDMA) networks, with a double balanced detection mechanism. We construct 3D carrier‐hopping prime/modified prime (CHP/MP) codes by extending a two‐dimensional (2D) CHP code integrated with a one‐dimensional (1D) MP code.
Chih-Ta Yen, Chih-Ming Chen, Mo Li
wiley   +1 more source

Reconfigurable multi-level phase shift keying encoder-decoder for all-optical networks [PDF]

, 2003
We demonstrate the application of a uniform Bragg grating as a dynamically reconfigurable phase encoder-decoder for optical systems. Precise discrete phase modulation between chips is obtained simply by heating segments along the grating with fine ...
M.R. Mokhtar, M. Ibsen, Teh, P.C., Mokhtar, M.R., Ibsen, M., Richardson, D.J., P.C. Teh, D.J. Richardson   +7 more
core   +1 more source

A high-speed integrated OFDM/DPS-OCDMA-based FSO transmission system: Impact of atmospheric conditions

Alexandria Engineering Journal, 2023
Free space optics (FSO) communication systems are preferred due to their high transmission capacity so it can support the ever-increasing volume of online traffic. Optical code division multiple access (OCDMA) is ideal for enhancing capacity by utilizing
Mehtab Singh, Somia A. Abd El-Mottaleb, Hassan Yousif Ahmed, Medien Zeghid, Kottakkaran Sooppy Nisar, Ameenah N. Al-Ahmadi, Mona Mahmoud   +6 more
doaj   +1 more source

Free Space Optics: Current Applications and Future Challenges

International Journal of Optics, Volume 2015, Issue 1, 2015., 2015
FSO is a communication system where free space acts as medium between transceivers and they should be in LOS for successful transmission of optical signal. Medium can be air, outer space, or vacuum. This system can be used for communication purpose in hours and in lesser economy.
Aditi Malik, Preeti Singh, José Luís Santos   +2 more
wiley   +1 more source

Feasibility study of SOA-based noise suppression for spectral amplitude coded OCDMA [PDF]

, 2007
We investigate the benefits of employing a saturated SOA to reduce optical noise in an incoherent light OCDMA system. In the context of spectrum-slicing, SOA-based noise suppression has shown significant potential for enhancing the signal quality of ...
Horak, P., Anoma D. McCoy, Morten Ibsen, David J. Richardson, Thomsen, B.C., Benn C. Thomsen, McCoy, A.D., Ibsen, M., Peter Horak, Richardson, D.J.   +9 more
core   +2 more sources

Novel decoding of convolutional codes for OCDMA system

Tongxin xuebao, 2009
The characteristics of optical code division multiple access（OCDMA） and convolutional codes were introduced.Based on the tunnel model of OCDMA with its multiple access interference（MAI）, and according to its characteristics, a novel decoding of ...
ZHOU Hai-xian, XU Guo-liang, YAO Wei
doaj   +2 more sources