"This site requires JavaScript to work correctly"
minimize Header

Dr. -Ing. Sunil Survaiya

Teaching Campus Cham

Lecturers

Lecturer

DMS C115

09971/99673-27

Sortierung:
Contribution
  • Sunil Survaiya
  • R. Shevgaonkar

Analysis of a broadband mode converter.

In: ACOFT 2000: 25th Australian Conference on Optical Fibre Technology. pg. 159-161

IREE Society Canberra, Australia

  • (2000)

DOI: 10.3316/informit.247116169642835

show abstract

To meet the increasing needs of high speed communication, wavelength division multiplexing (WDM) systems are emerging very rapidly. There has also been considerable interest in upgrading the existing single channel fiber optic networks to the multichannel WDM systems. With the invention of the EDFA, the data carrying capacity is mainly limited by the fiber dispersion. Dispersion compensating schemes provide a cost effective option for upgrading the existing networks to WDM networks. One of the dispersion compensation schemes uses higher order mode propagation in the compensating fiber [1]. It has been shown that a wide band dispersion compensation can be achieved by proper design of the compensating fiber (CF)[2]. The scheme however needs mode converters, for converting LP01 to LP011 mode and vice versa. To achieve wide band dispersion compensation, the mode converter also should have wide band characteristics. In this paper, we theoretically investigate a broad band mode converter (MC) in the form of a tilted fiber bragg grating (TFBG). This MC has advantage over other types of converter that it is compact and can be easily spliced with the existing and the dispersion compensating fiber.
Contribution
  • Sunil Survaiya
  • R. Shevgaonkar

`Design of low dispersion links.

In: Proceedings of IEEE Antennas and Propagation Society International Symposium and URSI National Radio Science Meeting. pg. 217-220

  • (1994)
Contribution
  • Sunil Survaiya
  • R. Shevgaonkar

Subpicosecond dispersion fiber for WDM systems. S. P. Survaiya and R. K. Shevgaonkar, ”, , pp. 34 - 38, , Feb. 1995..

In: Proceedings of National Symposium on Recent Advances in Microwave and Light Guiding. pg. 34-38

  • (1995)
Journal article
  • Sunil Survaiya
  • R. Shevgaonkar

Design of subpicosecond dispersion-flattened fibers.

In: IEEE Photonics Technology Letters vol. 8 pg. 803-805

  • (1996)

DOI: 10.1109/68.502100

show abstract

Dispersion flattened (DF) fibers are required for wide-band WDM systems. The DF fibers designed in the past have dispersion in the range of 2.0-3.0 ps/km-nm. In this letter, we define a generalized refractive index profile that can be characterized by few controlling parameters. An optimum refractive index profile is obtained by minimizing the maximum dispersion over the wavelength range of 1300-1600 nm with respect to profile parameters. The designed fiber gives dispersion less than 1.0 ps/km-nm over 1350-1590 nm wavelength range. Sensitivity of the dispersion performance to the profile parameters is also discussed.
Contribution
  • S. Narayandkhedkar
  • Sunil Survaiya
  • R. Shevgaonkar

Propagation of high speed data through Bragg grating.

In: Proceedings of Photonics '98. pg. 291-294

  • (1998)
Contribution
  • Sunil Survaiya
  • R. Shevgaonkar

Dispersion compensating fiber carrying LP01 mode.

In: Proceedings of the 1998 National Symposium on Recent Advances in Microwaves and Lightwaves. pg. 174-177

  • (1998)
Journal article
  • Sunil Survaiya
  • R. Shevgaonkar

Dispersion Compensating Fiber for EDFA Window Without using Higher Order Modes.

In: Journal of Optics vol. 27 pg. 139-145

  • (1998)

DOI: 10.1007/BF03549342

show abstract

In this paper, a dispersion compensation scheme for the Erbium doped fiber amplifier (EDFA) window without using higher order mode is presented. Linear Finite Element Method (LFEM) is employed for investigating the dispersion compensating characteristics of a fiber having novel chirp type refractive index profile. It is shown that with optimization of the profile parameters a large negative dispersion of -238.88 ps/nm-km can be achieved for LP mode itself over the entire EDFA window (1.53plm-1.56nm). When the proposed compensating fiber is added to the existing single mode fiber in a ratio of 1:15.6, the average compensated dispersion lies within ± 1 ps/nm-km over the EDFA window. The stability of 1/ P/Am.Km dispersion characteristics against the profile parameters is studied. The splice loss due to mismatch of the mode field diameter of the existing fiber and dispersion compensating fiber (DCF) is also evaluated.
Contribution
  • Sunil Survaiya
  • R. Shevgaonkar

Dispersion compensating fiber with very high negative dispersion.

In: Proceedings of Optoelectronics and Communications Conference (OECC'98). pg. 260-261

  • (1998)
Journal article
  • Sunil Survaiya
  • R. Shevgaonkar

Dispersion characteristics of an optical fiber having linear chirp refractive index profile.

In: Journal of Lightwave Technology vol. 17 pg. 1797-1805

  • (1999)

DOI: 10.1109/50.793753

show abstract

We analyze the dispersion characteristics of an optical fiber having linear chirp type refractive index profile. The chirp type profile is general in nature and by controlling the profile parameters, one can obtain a wide range of profiles from simple step index to complex multiple cladded type. The problem is treated as an optimization problem in the profile parameter space. It is shown that a variety of dispersion characteristics can be realized with proper optimization of the profile parameters. Linear finite element method (LFEM) is employed for computing the modal fields and propagation constants. Tolerance analysis of the fiber dispersion characteristics and bending loss calculation are also carried out.
Contribution
  • Sunil Survaiya
  • R. Shevgaonkar

Mode converter for broadband dispersion compensation.

In: Technical Digest. CLEO/Pacific Rim '99. Pacific Rim Conference on Lasers and Electro-Optics (Cat. No.99TH8464). pg. 595-596

IEEE

  • (1999)

DOI: 10.1109/CLEOPR.1999.817736

Contribution
  • Sunil Survaiya
  • R. Shevgaonkar

Broadband dispersion compensation using fiber Bragg grating.

In: Proceedings International Photonics Conference.

  • (2000)
Contribution
  • Sunil Survaiya
  • R. Shevgaonkar

Large effective area fiber for DWDM systems.

In: Proceedings International Photonics Conference. pg. 45-48

  • (2000)
Contribution
  • D. Shah
  • Sunil Survaiya
  • R. Shevgaonkar

A novel technique for walk-off compensation in very long distance 4 Gbytes/s bit parallel WDM link.

In: National Conference on Communication 2000. pg. 138-140

  • (2000)
Contribution
  • Sunil Survaiya
  • R. Shevgaonkar

Large effective area fiber for DWDM systems.

In: Photonics 2000: International Conference on Fiber Optics and Photonics. (SPIE Proceedings) pg. 417

  • Eds.:
  • R. Gangopadhyay
  • B. Mathur
  • S. Das
  • S. Lahiri
  • A. Datta
  • S. Ray

SPIE

  • (2001)

DOI: 10.1117/12.441329

show abstract

In this paper, we analyze and propose an exponentially modulated refractive index profile for large effective area fibers with non-zero dispersion characteristics. A linear finite element method is used for computing the modal propagation characteristics and modal field distributions of an optical fiber having an arbitrary refractive index profile. The core effective area and the dispersion characteristics are optimized by optimizing a constraint objective function in the profile parametric space. The optimum refractive index profile can give a core effective area of 110 micrometers 2. The dispersion varies linearly from 2.5 ps/nm-km to 4.5 ps/nm-km with a dispersion slope of 0.065 ps/nm2-km over 1.53 micrometers -1.56 micrometers wavelength range. Manufacturing tolerance analysis for the designed fiber characteristics is also studied. The bending loss for the fiber is around 0.003 dB/m for a bend radius of 100mm.
Contribution
  • Sunil Survaiya
  • Sushant Saxena

Dispersion compensation using transmission-based nonuniform grating.

In: Optical Engineering for Sensing and Nanotechnology (ICOSN 2001). (SPIE Proceedings) pg. 170

  • Eds.:
  • K. Iwata

SPIE

  • (2001)

DOI: 10.1117/12.427041

show abstract

In this paper, we analyze and propose a non-uniform transmission based ramp chirp grating which can give maximum negative dispersion profile over broadband wavelength range. Coupled mode theory is used for obtaining quantitative information about the delay spectral dependence of the grating structure. A matrix method is used for analyzing the grating characteristics. For a grating length of 25 m, the grating can give negative dispersion of 266 ps/nm. When the grating is inserted after 16.07 km in line with the existing fiber optic link, the maximum average compensated dispersion lies within +/- 1.0 ps/nm-km over 1530-nm - 1560-nm wavelength range.
Journal article
  • Sunil Survaiya
  • R. Shevgaonkar

Design of a large effective‐area nonzero‐dispersion fiber for DWDM systems.

In: Microwave and Optical Technology Letters vol. 29 pg. 238-244

  • (2001)

DOI: 10.1002/mop.1143

show abstract

In this paper, we analyze and propose an optimum index profile which can give a larger core effective area with nonzero-dispersion characteristics. The index profile is modeled by an exponentially modulated linear chirp profile function. A linear finite-element method (LFEM) is used for computing the transmission characteristics of an optical fiber having an arbitrary refractive-index profile. The optimum index profile can give a core effective area of 117 μm2. The dispersion varies linearly from 2.5 to 4.5 ps/nm⋅km with a dispersion slope of 0.065 ps/nm2⋅km over the 1.53–1.56 μm wavelength range. Sensitivity analysis for the designed fiber characteristics is also studied. The bend loss is about 0.001 dB/m for a bend radius of 100 mm. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 29: 238–244, 2001.
Contribution
  • Sunil Survaiya
  • R. Shevgaonkar

Mode transformer for dispersion managed systems.

In: Photonics 2002 Conference (FBR 3.3). Abstract Book pg. 59

  • (2002)
Contribution
  • R. Narevich
  • E. Narevicius
  • G. Heise
  • J. Dieckroeger
  • D. Krabe
  • Sunil Survaiya
  • P. Schicketanz
  • I. Vorobeichik
  • H. Wagner
  • S. Wang

Tunable gain tilt compensator using adiabatic mode multiplexing.

In: 2006 Optical Fiber Communication Conference and the National Fiber Optic Engineers Conference (OFCNFOEC 2006). pg. 3 pp

IEEE

  • (2006)

DOI: 10.1109/OFC.2006.215659

show abstract

We built gain tilt compensator in silica on silicon using adiabatic mode multiplexer and y-branch based Mach-Zehnder interferometer. Process and design tolerant building blocks allow flexibility in achieving required response, either normally bright or tilted, and excellent optical performance.
Contribution
  • A. Kondapuram
  • A. Treytl
  • Sunil Survaiya
  • T. Sauter

Watermark Based Sensor Data Protection System for Wireless Sensor Network.

In: 2023 IEEE 21st International Conference on Industrial Informatics (INDIN). pg. 1-8

IEEE

  • (2023)

DOI: 10.1109/INDIN51400.2023.10218221

show abstract

Most of the sensor nodes in the Internet of Things (IoT) and home automation systems (HAS) applications are designed to be low-cost and energy efficient. These devices are expected to be lightweight, and flexible with low maintenance. These criteria limit the computational and communications capabilities of such systems whereas system protection and data authentication have always been limitation factors due to security cost complexity.In this paper, we investigate and propose a simple, lightweight, and cost-effective watermark security method for Wireless sensor networks (WSNs). It is an improved version of our previous research on the metadata-enhanced cross-watermarking approach. The original watermark generator has been extended to achieve cipher block chaining integrating with side-channel watermarking. The watermark bits are hidden in the transmitting channel properties. The experimental results and security analysis prove this scheme, provide data authenticity and transmission integrity without additional security payload.