A pair of fiber Bragg grating (FBG) comb filters with different channel-spacings are
designed and fabricated to measure strain. The reflection peaks of one comb filter shift
when the strain changes. And the other comb filter is used as calibration standard. The
two comb filters have different channel-spacings, 1.00 nm and 0.95 nm, which can be
regard as the structure of vernier caliper. In our experiment, the strain resolution is about
41.7 με, with low demand of the demodulation devices. And it could be greatly improved
further in terms of Gaussian fitting technology of the peaks' intensity.
Pulse width variation due to source chirp, chromatic dispersion, chip length of en/decoders and its corresponding impact
on electrical power at PIN receiver is analyzed in this paper. The result, which is verified by a 2×2 OCDMA system at
127-chip 320-Gchip/s, shows that broadened pulse width degrades SNR. And system performance is limited by not only
code length and pulse width, but also chip length.
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