${\mathbf{e}}_t$	Tangential component of electric field vector
$e_{co}$	Radial electric field intensity distribution in the core
$e_{cl}$	Radial electric field intensity distribution in the cladding
l	Azimuthal mode number
m	Radial mode number
$\varphi$	Azimuthal coordinate in cylindrical geometry
r	Radial coordinate in cylindrical geometry
z	Axial coordinate in cylindrical geometry
$a_{core}$	Core radius
$b_{clad}$	Cladding outer radius
$\beta$	Propagation constant
${\mu }_0$	Magnetic permittivity of free space
${\epsilon }_0$	Electric permittivity of free space
$\omega$	Angular velocity of light
$n\left(r\right)$	Refractive index radial profile
${\nabla }^2$	Laplacian operator
k	Generalized frequency parameter $f\left(\omega \right)$
V	Non-dimensional modal number
b	Generalized guide index
$n_{co}$	Core refractive index
$n_{cl}$	Cladding refractive index
$\psi$	Parametric radial coordinate transformation
$\overrightarrow{q}$	State vector
d	Infinitesimal coordinate near origin
p	Boundary value problem unknown parameter
$E_l$	Amplitude constant
$J_l$	Bessel function of the first kind
$K_l$	Modified Bessel function of the second kind
$\lambda$	Wavelength of light
$NA$	Numerical aperture
$L{P}_{l,m}$	Linearly polarized mode $l,m$
$V_m$	Volume of monomeric unit
$D_m$	Diameter of monomeric unit
$l_m$	Length of monomeric unit
$M_n$	Number average molecular weight
$m_w$	Molecular weight
$\rho$	Density of PDMS
$DP$	Degree of Polymerization
$m_c$	Mass of polymer chain
$N_A$	Avogadro’s constant
$N_c$	Number of chains
$V_c$	Volume of polymer chains
$m_{total}$	Total mass of fiber
$V_{polymer}$	Total volume of polymer
${\varphi }_i$	Volume fraction of constituent
$n_{1\to m}$	Mixed refractive index of m constituents
$n_i$	Refractive index of constituent i
$P_{total}$	Total guided power
${\eta }_0$	Ratio of magnetic to electric permittivity
$P_{perturbed}$	Total guided power of perturbed fiber
$P_{reference}$	Total guided power of reference unaffected fiber
$\alpha$	Attenuation coefficient
$\mathsf{\Delta }z$	Length of perturbation
${U_d}_S$	System measurement uncertainty
${U_d}_D$	Output display accuracy
$e_1$	Readout Resolution
$l_e$	Vertical Linearity
$e_2$	Linearity uncertainty
UAE	United Arab Emirates
PIG	Pipeline Inspection Gage
MFL	Magnetic Flux Leakage
CCTV	Closed Circuit TV
OFS	Optical Fiber Sensors
SHM	Structural Health Monitoring
LPG	Long Period Grating
FBG	Fiber Bragg Grating
RI	Refractive Index
OTDR	Optical Time Domain Reflectometry
PDMS	Polydimethylsiloxane
ADNOC	Abu Dhabi National Oil Company
ADCO	Abu Dhabi Company for Onshore Oil Operations