| The bandwidth requirements for avionic platforms have been significantly increasing in the last couple of decades and are expected to reach 10Tb/s by 2010. This bandwidth demand, together with the need for the lightweight and compact systems , make fiber-optic technology a preferred choice over coaxial cable. While DWDM can easily satisfy the bandwidth needs, the use of DWDM systems inside the avionic platforms, characterized by large number of channels and a need for differentiated services, could result in a very low system utilization. Optical code division multiple access (OCDMA) can provide very high spectrum utilization, flexible data rates while offering the same data routing capabilities as WDM systems. In addition, OCDMA provides increased privacy, and simplified network control and management while delivering much higher channel count per number of used wavelengths, thus, making OCDMA a very efficient and promising technology for use in the avionic platforms.
With this in mind, we have designed and built a 4-user incoherent OCDMA avionics platform. The testbed runs at OC-24. Two dimensional wavelength-hopping time-spreading (WHTS) OCDMA codes were implemented using 3 wavelengths and 11 time chips. As part of this effort, we have also developed and demonstrated a novel tunable optical encoders/decoders with the capability to swap the codes on the bit-to-bit bases to enhance the channel isolation and the security. To demonstrate low-cost, small-footprint solution for WHTS encoders/decoders implementation, a holographic Bragg reflector (HBR) technology was used to fabricate an integrated optical CDMA encoder-decoder matching pair. The performance of such encoder-decoder pair, each capable of operating with two sets of WHTS codes simultaneously, will be demonstrated. We will show that the HBRs capabilities simplify the implementation of a dual encoder/decoder. We will also show that code and signature swapping during data transmission can achieve higher degree of security and privacy.
Acknowledgement: This work was supported by DARPA under contract No.: MDA972-03-1-0006
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| Dr. Ivan Glesk received his Ph.D. degree in Quantum Electronics and Optics from Comenius University, and D.Sc degree from the Slovak Academy of Sciences. In 1986, he joined Comenius University where he became Professor of physics at the Department of Experimental Physics where he conducted research in the areas of nonlinear optics, laser physics, and LIDAR sensing. As is IREX Fellow he was a Visiting Fellow at the Department of Mechanical and Aerospace Engineering at Princeton University in 1990-1991. In 1991, he joined the Department of Electrical Engineering at Princeton University where he is currently Senior Research Scholar and Manager of the Lightwave Communication Research Laboratory. His area of expertise encompasses ultra-short pulsed laser systems; ultrafast all-optical devices, optical switching, networks and interconnects. Dr.Glesk co-developed an Ultrafast All-Optical Asymmetric Demultiplexer known as TOAD, was first to demonstrate ultrafast all-optical demultiplexing of optical TDM data at 250Gb/s, all-optical address recognition and self-routing of photonic packets in 250 Gb/s packet-switched testbed, and Tb/s all-optical routing switch.
He has co-authored 16 book chapters, over 200 scientific publications, presented numerous invited talks and lectures and holds two US patents.. He was invited to join several international committees and panels. Dr.Glesk is IEEE Senior Member. |