Instrumentation & Measurement Magazine 24-5 - 8

Fig. 4. (a) Core power fraction for different analytes of the proposed gas sensor [15], used with permission ©IEEE. (b) Relative sensitivity of the proposed gas
sensor [15], used with permission ©IEEE. (c) Change of resonance frequency with the change of refractive index. (d) Calculated group velocity dispersion (GVD) of
an evacuated HC-ARPCF with a 3 mm core diameter, and 0.09 mm polymer web (green curve).
Comparison between Linear and
Nonlinear Properties of HC-PCF
In this section, we outline the linear and nonlinear properties
of different HC-PCF and determine the best candidate for nonlinear
fiber sensing. Based on guiding mechanisms, HC-PCF
comes in two main varieties. The first is a photonic bandgap
(PBG) fiber shown in Fig. 5a that exhibits low loss, confines
light strongly, and the GVD has a steep slope that makes it suitable
for spectral filtering.
The second type of HC-PCF has a kagomé lattice cladding
shown in Fig. 5b that can exhibit ultra-broadband guidance of
light with extremely low loss and displays weak anomalous
GVD over the entire transmission window employing a low
dispersion slope. The kagomé-lattice fiber can also exclude the
anticrossing with a strong cladding resonance. These cladding
resonances are quite narrow and disrupt the transmission window,
and therefore, they have very little impact on dispersion
properties [2].
8
Fig. 5. Cross-section of HC-PCF in (a) photonic bandgap style and (b) kagomé
style [1], with their corresponding enlarged cladding patterns. Images used
with permission from [1], © The Optical Society.
IEEE Instrumentation & Measurement Magazine
August 2021

Instrumentation & Measurement Magazine 24-5

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