16 April 2010 Pattern recognition of electronic bit-sequences using a semiconductor mode-locked laser and spatial light modulators
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Abstract
A novel scheme for recognition of electronic bit-sequences is demonstrated. Two electronic bit-sequences that are to be compared are each mapped to a unique code from a set of Walsh-Hadamard codes. The codes are then encoded in parallel on the spectral phase of the frequency comb lines from a frequency-stabilized mode-locked semiconductor laser. Phase encoding is achieved by using two independent spatial light modulators based on liquid crystal arrays. Encoded pulses are compared using interferometric pulse detection and differential balanced photodetection. Orthogonal codes eight bits long are compared, and matched codes are successfully distinguished from mismatched codes with very low error rates, of around 10-18. This technique has potential for high-speed, high accuracy recognition of bit-sequences, with applications in keyword searches and internet protocol packet routing.
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Sharad Bhooplapur, Sharad Bhooplapur, Mehmetkan Akbulut, Mehmetkan Akbulut, Franklyn Quinlan, Franklyn Quinlan, Peter J. Delfyett, Peter J. Delfyett, } "Pattern recognition of electronic bit-sequences using a semiconductor mode-locked laser and spatial light modulators", Proc. SPIE 7700, Enabling Photonics Technologies for Defense, Security, and Aerospace Applications VI, 770003 (16 April 2010); doi: 10.1117/12.852763; https://doi.org/10.1117/12.852763
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