Prof. Bishnu P. Pal Profile

Prof. Bishnu P. Pal

Professor and Dean of Academics at Mahindra Univ

SPIE Involvement:

Conference Program Committee | Author

SPIE Journal Paper | 15 March 2019

Design of a silicon-on-calcium-fluoride-based ultracompact and highly efficient polarization splitter for the midinfrared

Babita Kumari, Ravendra Varshney, Bishnu Pal

OE, Vol. 58, Issue 03, 037102, (March 2019) https://doi.org/10.1117/12.10.1117/1.OE.58.3.037102

KEYWORDS: Picosecond phenomena, Silicon, Mid-IR, Polarization, Erbium, Tolerancing, Optical engineering, Brain-machine interfaces, Refractive index, Silicon photonics

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Proceedings Article | 23 February 2018 Paper

Single split gap resonator based terahertz metamaterials for refractive index sensing

S. Jagan Mohan Rao, Maidul Islam, Gagan Kumar, Bishnu Pal, Dibakar Roy Chowdhury

Proceedings Volume 10531, 105311K (2018) https://doi.org/10.1117/12.2287320

KEYWORDS: Metamaterials, Terahertz radiation, Refractive index, Polarization, Terahertz metamaterials, Resonators, Thin films, Biosensing, Split ring resonators

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Proceedings Article | 15 June 2015 Paper

Temperature assisted band-gap engineering in all-solid chalcogenide holey fiber for mid-IR application

Ajanta Barh, R. Varshney, B. Pal, J. Sanghera, L. Shaw

Proceedings Volume 9654, 96541P (2015) https://doi.org/10.1117/12.2182330

KEYWORDS: Mid-IR, Glasses, Micro optical fluidics, Chalcogenides, Optical filters, Structured optical fibers, Thermal optics, Photonic crystals, Cladding, Sensors

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Proceedings Article | 29 November 2011 Paper

Design and fabrication of an asymmetric twin-core fiber directional coupler for gain-flattened EDFA

B. Nagaraju, M. Ude, S. Trzésien, B. Dussardier, R. Varshney, G. Monnom, W. Blanc, B. Pal

Proceedings Volume 8307, 83070I (2011) https://doi.org/10.1117/12.905575

KEYWORDS: Optical amplifiers, Directional couplers, Fiber couplers, Refractive index, Polishing, Optical filters, Erbium, Cladding, Signal to noise ratio, Dense wavelength division multiplexing

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Proceedings Article | 24 August 2011 Paper

Side-polished fiber based high sensitive temperature sensor

Prerana ., Ravi Varshney, Bishnu Pal, Nagaraju B.

Proceedings Volume 8173, 81731S (2011) https://doi.org/10.1117/12.898910

KEYWORDS: Waveguides, Temperature sensors, Sensors, Quartz, Overlay metrology, Refractive index, Fiber optics sensors, Cladding, Fiber optics, Fiber couplers

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Proceedings Article | 14 October 2010 Paper

Dual core photonic crystal fiber-based intrinsically gain flattened EDFA

B. Nagaraju, S. Garg, R. Varshney, B. Pal

Proceedings Volume 7839, 78390Q (2010) https://doi.org/10.1117/12.867148

KEYWORDS: Optical amplifiers, Erbium, Optical filters, Photonic crystal fibers, Composites, Photonic crystals, Fiber amplifiers, Directional couplers, Refractive index, Phase matching

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Proceedings Article | 9 September 2010 Paper

Analysis and realization of a fiber optic turbidity sensor based on measurements of scattered light

. Prerana, M. Shenoy, B. Pal, B. Gupta

Proceedings Volume 7653, 76532S (2010) https://doi.org/10.1117/12.866450

KEYWORDS: Mirrors, Optical fibers, Sensors, Light scattering, Fiber optics sensors, Scattering, Fiber optics, Monte Carlo methods, Liquids, Optical testing

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Proceedings Article | 18 November 2008 Paper

Design and realization of a side-polished single-mode fiber optic high-sensitive temperature sensor

B. Nagaraju, R. Varshney, B. Pal, A. Singh, G. Monnom, B. Dussardier

Proceedings Volume 7138, 71381H (2008) https://doi.org/10.1117/12.818039

KEYWORDS: Temperature sensors, Single mode fibers, Temperature metrology, Thermal optics, Fiber optics sensors, Cladding, Waveguides, Polishing, Fiber optics, Sensors

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SPIE Journal Paper | 1 January 2006

All-fiber interferometric technique for estimating the mode effective index of a single-mode fiber

Naveen Kumar, M. Shenoy, Bishnu Pal

OE, Vol. 45, Issue 01, 015004, (January 2006) https://doi.org/10.1117/12.10.1117/1.2150475

KEYWORDS: Single mode fibers, Interferometry, Interferometers, Fiber couplers, Optical engineering, Mach-Zehnder interferometers, Estimation theory, Microscopes, Cladding, Optical fibers

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Proceedings Article | 25 September 2001 Paper

Understanding coupling mechanism in fused fiber coupler-based components: role of core and cladding modes

Partha Chaudhuri, B. Pal, M. Shenoy

Proceedings Volume 4417, (2001) https://doi.org/10.1117/12.441327

KEYWORDS: Fiber couplers, Cladding, Waveguides, Wavelength division multiplexing, Wave propagation, Refractive index, Structured optical fibers, Photonics, Process modeling, Physics

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Proceedings Article | 25 September 2001 Paper

Design of an ultra-fast IMDD-WDM simulator based on spectrum evolution through transfer matrix approach

B. Pal, Ranjan Gangopadhyay

Proceedings Volume 4417, (2001) https://doi.org/10.1117/12.441301

KEYWORDS: Wavelength division multiplexing, Dispersion, Eye, Modulation, Computer simulations, Optical amplifiers, Single mode fibers, Ultrafast phenomena, Scanning probe microscopy, Fiber amplifiers

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Proceedings Article | 28 April 1999 Paper

Realizing fused fiber coupler branching components: software-driven fabrication, characteristics, and WDM modeling

Partha Chaudhuri, M. Shenoy, B. Pal

Proceedings Volume 3666, (1999) https://doi.org/10.1117/12.347904

KEYWORDS: Wavelength division multiplexing, Fiber couplers, Control systems, Planar waveguides, Structured optical fibers, Waveguides, Optical fibers, Interfaces, Photodetectors, Amplifiers

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Proceedings Article | 2 January 1998 Paper

Analysis of multilayer in-line fiber and semiconductor-based guided wave components

Gunjan Chakravarty, B. Pal

Proceedings Volume 3211, (1998) https://doi.org/10.1117/12.345544

KEYWORDS: Semiconductors, Waveguides, Single mode fibers, Overlay metrology, Dielectrics, Integrated optics

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Proceedings Article | 2 January 1998 Paper

High-silica optical fibers and trends in lightwave communications: a twenty-five year-retrospective

B. Pal

Proceedings Volume 3211, (1998) https://doi.org/10.1117/12.345369

KEYWORDS: Optical fibers, Fiber optic communications, Optical communications, Optical amplifiers, Single mode fibers, Multimode fibers, Wavelength division multiplexing, Glasses, Light emitting diodes, Transmittance

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Low-loss high-silica fibers were first reported in 1970 and since then these glass fibers have proven to be the most viable transmission media for lightwave communication. Even though the first low loss fiber was a single-mode fiber, initial systems revolved around multimode fibers from the point of view of practical reasons like easier fiber to fiber splicing and coupling from off-the-shelf available LEDs. Since early 1980s, single-mode fibers became the preferred media for optical transmission and single-mode fibers overtook the multimode fibers for lightwave communication. Networks which operate with single-mode fibers at the 1.31 /mm low-loss wavelength window are now taken for granted. Operations with advanced fiber designs at the silica fiber’s lowest loss window of 1.55 /mm are now gearing to take over the long-haul routes; these are contemplated to be based on erbium doped fiber amplifiers (EDFA) and dispersion shifted fibers. An alternative and promising scheme for this wavelength window involving use of already laid fibers optimized for 1.31 /an requires insertion of a dispersion compensating fiber(DCF) as an additional component in the link. In the immediate future, lightwave systems would operate with EDFA at the OC-48 level, which amounts to a bit rate of — 2.5 Gb/s and are compatible with SDH (STM-16) networks. For WDM transmission with EDFAs, one would require a variety of in-line fiber components like wavelength selective couplers, and bandpass/bandstop filters to add/drop channels. Until recently, optical fibers were considered to be optically linear. However, with the introduction of EDFAs, which provide large and broadband (* 30-35 nm) optical gains, a large number of WDM information channels can be transmitted and simultaneously provided gains across this broad gain spectrum of EDFAs. Furthermore, amplifier spacings could be much longer than the present day regenerator spacings. These two fall outs of EDFA namely, large optical power density and long interaction lengths have elevated optical fiber nonlinearities to an important design issue in lightwave systems. In this presentation we would aim to trace the evolutionary trends in lightwave communications seen along the above lines since the reporting of the first low-loss fibers a quarter century ago. INTRODUCTION