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Government Agency Affiliates

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.

RF cancellation 2 nodes

Optical Cancellation with Gas sensor


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


Phase II OCDMA


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

Reconfigurable OCDMA


IDA


National Security Agency


Center for Computing Sciences