Dinesh Kumar Sharma

Splice Losses in Microstructured Optical Fibers: An Analytical Approach

We have recently developed a simple method based on variational principle for the scalar analytical approach to study the propagation characteristics of MOFs. The model retains required azimuthal variation of field unlike Effective index method (EIM). We have analyzed, based on this model, the splice loss between two MOFs and that between an MOF and a conventional step‐index fiber (SMF‐28). As expected, the splicing between two MOFs depends on the relative orientation of air‐holes. For typical fibers, this loss could be as high as 0.23 dB.

Far-field of index-guiding microstructured fibers: an analytical field model

An analytical approximation for the modal field of a single mode index-guiding microstructured fiber is developed further to obtain the evolution of the far-field pattern of these fibers. Comparison with available experimental results is also included.

Mode field diameters of index-guided microstructured optical fibers

Using our earlier developed analytical field model, which retains the required azimuthal variation of field for the index-guiding microstructured optical fibers (MOFs), we show that Gaussian approximation based analysis for the mode field diameters (MFDs) is likely to give inaccurate results and suggest improvements.

Mode field expansion in index-guiding microstructured optical fibers

The mode-field expander (MFE) is a microstructured optical fiber (MOF) based device that enlarges the modal field distribution and can couple light from large mode area (LMA) fibers into small core fibers or vice-versa and other optical waveguides. Using our earlier developed analytical field model, we studied the mode-field expansion in MOFs having triangular lattice, and low-loss splicing of MOFs to standard single-mode fibers (SMFs), based on the controlled all airhole collapse method, which leads to an optimum mode-field match at the joint interface of the MOF-SMF. Comparisons with available experimental and simulation results have also been included.

Optical Properties of Square-Lattice Microstructured Optical Fibers

Modifying our earlier developed analytical field model we have studied the modal properties of index-guided microstructured optical fibers with square-lattice of air-holes in photonic crystal cladding. Comparison with available numerical simulation results has been included.

Terahertz microstructured optical fibers: An analytical field model

Microstructured optical fibers (MOFs) have wavelength scale periodic microstructure running along their length. Their core and two-dimensional microstructured cladding might be based on varied geometries and materials, enabling light guidance due to different propagation mechanisms over an extremely large wavelength range, extending to the terahertz (THz) frequency region. As a result, these fibers have revolutionized the optical fiber technology by means of creating new degrees of freedom in the fiber design, fabrication and applicability. We analytically study the modal properties of terahertz microstructured optical fiber (THz MOF), by using our analytical field model, developed for optical waveguides.

Tellurite Glass Microstructured Optical Fibers: An Analytical Approach

Microstructured optical fibers (MOFs) have generated broad interest due to their extraordinary optical properties which arises from the combination of wavelength scale features in the photonic crystal cladding and the high index contrast between the background material and the air. We analytically study the optical properties of nonsilica glasses such as tellurite (TeO2) glass based MOFs by using our earlier developed analytical field model. We have compared the accuracy of our simulated results with numerical simulation results available in the literature.

Design of Long-Period Gratings Imprinted in Microstructured Optical Fibers

For inscription of long-period grating in microstructured optical fibers (MOFs), their cladding parameters need to optimize. Using our earlier developed field model for index-guiding MOFs with triangular lattice of voids these parameters can be optimized.

Spot size of photonic crystal fibers: An analytical method of calculation

Based on variational principle, we have earlier developed an analytical model for the modal field of index-guiding microstructured optical fibers (MOFs). Using the model, we study the linear properties of MOF such as spot-sizes; their application in calculating numerical aperture NA and splice loss between an MOF and SMF-28 with transverse offset. Comparisons with available experimental and simulation results have also been included.

Beam divergence for index-guiding microstructured optical fibers

We analytically study the wavelength dependence of the beam divergence for a single-mode index-guiding microstructured optical fiber and compare with available experimental results.