Abstract
This work addresses important issues of photonic crystal fiber (PCF)
interferometers built by fusion splicing: high insertion loss, low
mechanical strength, and complex multiplexing schemes. We have found that by
decreasing the length of the collapsed region in these interferometers, the
overall insertion losses diminish (down to 0.7 dB) without compromising
their performance and mechanical strength. To multiplex such
interferometers, we have used the frequency-division-multiplexing technique
combined with a simple fast Fourier transform demodulation method. To avoid
crosstalk between the interferometers, we have calculated the optimal
relationship between their periods. The results reported here may allow the
development of functional and competitive PCF devices or PCF-based sensor
networks and can be adapted to multiplex any other optical fiber sensors
that exhibit sinusoidal patterns.
© 2010 IEEE
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