CNSA

US Army CERDEC/ARDEC

RF Interference Cancellation by Optical Counter-Phase Modulation

A technique that enables cancellation of narrowband signals by >80 dB, over a wide range of frequencies. The results are extendable to wideband and multi-tone inputs.

DARPA MTO

Phase II reconfigurable incoherent OCDMA testbed

• Introduced the concept of M-ary (multi-symbol) OCDMA to increase spectral efficiency
• Demonstrated 10 Gb/s usingoptical encoded PPM (M-ary) with M = 4, 6 users
• INtegrated, computer-controlled tunable delay lines allowed receiver to tune to any transmitter code
• Scalability analysis shows 31 simultaneous users
• Also demonstrated asynchronous, incoherent OOK operating at 5 Gb/s with 8 users @ 10^-9 BER

USAF/Rome

Reconfigurable incoherent OCDMA testbed

• Introduced the concept of "soft blocking" in OCDMA system
• Asynchronous, incoherent OOK operating at 2.5 Gb/s
• Demonstrated 4 users at 10^-9 uncorrected BER with computer controlled tunable receiver
• (4, 41) carrier hopping prime codes, maintain orthogonality for multi-rate, multi-QoS transmission
• Modified for Phase III Lincoln Labs application
• Scalable to 10 simultaneous users

IDA

National Security Agency

Center for Computing Sciences