Koustav Dey

8 Questions 18 Answers 0 Followers

Questions related from Koustav Dey

How the group dispersion affects the spectral properties of multi-single-multi mode (MSM) fiber structure?

Different cascaded fiber structures such as single-multi-single (SMS) mode, multi-single-multi (MSM) etc. have unique spectral features due to the multimode interference (MMI) phenomena. The...

16 July 2022 5,883 2 View

How can I find the "Strain to refractive index influence factor", when a strain is subjected to the Fibre bragg Gratings (FBGs)?

The wavelength of a grating depends on the effective RI and the periodicity of the Gratings. Further, the periodicity and the effective refractive index of a grating solely depends on the applied...

23 May 2020 5,394 0 View

How the thermo-optic and thermal expansion coefficient of a etched fiber Bragg grating (FBG) changes compare with unetched fiber gratings?

Due to the etching technique, there will be a reduction in the diameter of the gratings. How this reduced diameter affects the thermo optic and thermal expansion coefficient of the fibre?

06 May 2020 3,589 0 View

How does the chemical etching (using HF) affect the temperature sensitivity of a fiber Bragg grating (FBG) inscribed in silica fiber?

Due to chemical etching, the cladding diameter of the silica fibre decreases with time. How does this reduced cladding diameter affect the temperature sensitivity of an FBG, which is inscribed on...

18 April 2020 5,077 2 View

What is the need of Fast Fourier Transform (FFT)in case of optical spectrum?

Generally, FFT is used to obtain the spectrum in the frequency domain. What are the informations we can get from the FFT analysis of a spectrum?

12 April 2020 581 8 View

How to find out the power spectral density(PSD) of an Optical time domain reflectometer (OTDR)?

I want the numerical value of PSD of the probe pulse of the OTDR. How can I get the value of PSD? Also, what is the value of the maximum PSD of the probe pulse?

31 March 2020 7,081 4 View

What is the value of modulation period of refractive index and modulation depth of refractive index for Fiber Bragg Gratings(FBGs)?

I am working on FBGs. I want to know the typical values of the following parameters of the FBGs. FBGs has drawn on pure silica fibre. 1.Modulation period of the refractive index? and 2. modulation...

27 March 2020 1,777 9 View

Is OTDR (Optical time domain reflectometer) suitable for measuring the reflected signal from FBG (fibre bragg gratings)?

Generally OTDR is used to locate the fault in long fibre by monitoring the reflected signal from the damage point.

27 December 2019 9,617 2 View