I worked as a Postdoc Researcher at Advanced Photonics Research Institute, Gwangju Institute of Science and Technology, South Korea. (October 2015 to September 2018). In APRI I had demonstrated the High power photonic crystal fiber laser design that shows a large mode area fibers with low propagation losses. In the same project I have demonstrated the cladding pump stripper, the structure leaks the high power through the corrugated cladding structure. The structure was numerically designed and evaluated the results, next we have also performed the experimental demonstration of the optical fiber using the CO2 laser. Along with we have also demonstrated the Spiral PCF to propagate the Orbital Angular Momentum modes. In this model, the designed structure can support 14 well-separated OAM modes with a mode low loss.

I also worked as a Postdoc Researcher at Center for Photon Information Processing, Gwangju Institute of Science and Technology, South Korea. (November 2014 to September 2015) We have proposed a hollow core fiber for light atom interaction and we have setup all the basic setting for this experiment. We have calculated the absorption of Rb in Hollow core photonic crystal fiber.

I did my Ph.D. at IIT Roorkee India (Prof. Vipul Rastogi)(August 2008- April 2014) In particular, I have worked on various novel designs in planar waveguide to achieve the high GVD, single polarization single mode operation, and gain flattening filter for erbium doped waveguide amplifier. In addition, an LPWG in a novel trench assisted waveguide is proposed to achieve broadband rejection, refractive index sensing and gain flattening of EDWA gain spectrum.

We have proposed dual core waveguide structure for dispersion compensation. The resonant coupling between the two cores of the waveguide results in the generation of symmetric and antisymmetric supermodes with a very high and opposite GVDs. Symmetric supermode possesses positive GVD and negative chromatic dispersion, and can be used to compensate the accumulated positive dispersion in an optical fiber. Such a design is particularly useful as a pre-compensator in view of the possibility of integration with the source.

We present a planar waveguide structure to achieve single polarization single mode operation. Here, we use dual core leaky waveguide structure using In-GaAs/AlGaAs semiconductor material layers on glass substrate. The design is based on the mode discrimination. We show that suitable choice of waveguide parameters leads to a resonant coupling design, which is very efficient for mode discrimination. The structure can be designed as TE-pass or TM-pass polarizer. Further, the single-mode operation of the structure is ensured by having high leakage loss for all the higher-order modes.

We have extended the application of dual core leaky waveguide for flattening the gain spectrum of erbium doped waveguide amplifier. In the present structure, spectral variation of leakage loss has been utilized to suppress the gain peak of the erbium doped waveguide amplifier and to achieve the flattened gain spectrum.

We investigate the long-period-grating in a trench assisted planar optical waveguide for application in wavelength filtering and refractive index sensing. The proposed structure shows triple resonances between a set of guided and cladding modes and results in an ultra-wide-rejection band over a wavelength span of 528 nm in the transmission spectrum of the grating. Furthermore, the proposed LPWG shows refractive index (RI) sensitivity of 1000 nm/RIU. In addition we have also designed such an LPWG for gain flattening of erbium doped waveguide amplifier gain in C-band. The transmission spectrum of the long period waveguide grating has been utilized to suppress the gain peak of the EDWA. Such a design is able to show the gain equalization within ±0.96 dB over the entire C-band.