Abstract
We proposed and demonstrated flexible optical code label generation
and processing using LiNbO<sub>3</sub> (LN) modulators and a variable-bandwidth spectrum shaper. First
we used a transversal filter (TVF) as a decoder and performed a simulation
of optical encoding and decoding to confirm basic code characteristics by
taking into consideration the characteristics of O/E conversion and threshold
processing. The experiments were performed using with 4 chip, 10 Gchip/s BPSK
codes to verify the simulation results. We found that these codes had sufficient
threshold margins for code discrimination in the simulation, and this result
was in good agreement with experimental results. Then, to handle variable
BPSK codes, we used LN modulators as an encoder and a TVF as a decoder. To
handle more variable BPSK codes, we proposed and experimentally demonstrated
optical code generation and processing using LN modulators and a variable-bandwidth
spectrum shaper (VBS). This method is capable of flexible optical encoding
and decoding and high-precision control in the spectral domain. We confirmed
correct discrimination between matched and unmatched coded by threshold processing
in a simulation and experiment using 8 chip, 20 Gchip/s codes. Finally, by
encoding pulses in the Non-Return-to-Zero (NRZ) format, we increased the number
of discriminable coded with 8 chip, 40 Gchip/s NRZ BPSK codes.
© 2012 IEEE
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