Seminar on Optical Isolator: Application to Photonic Integrated Circuits

Optical active devices fail to operate in a desired manner, when unwanted reflections are launched into them. An optical isolator plays an essential role in protecting optical devices from unwanted reflections. Commercially available optical isolators based on a magneto-optic Faraday effect, which are provided with optical fiber and optical beam interfaces, are hard to be integrated with other optical devices. In case of waveguide isolators, it is quite unrealizable to use a rotation of polarization, because the precise control of waveguide birefringence is needed. Several approaches have been developed to avoid the precise control of waveguide geometry, like a nonreciprocal radiation and a nonreciprocal loss isolator. An interferometric waveguide isolator, which uses a nonreciprocal phase shift provided by the first-order magneto-optic effect, has the advantages of a single polarization operation and a wide operational wavelength range. Also, the interferometric isolator is realizable in several waveguide platforms by using a magneto-optic material in a cladding layer. To achieve this, we developed a direct bonding technique of magneto-optic garnet on III-V compound semiconductors and silicon waveguides. In this talk, the integration of optical isolators will be addressed, which includes a non-magneto-optic approach. 

reference :http://www.eng.monash.edu.au

Advanced Optical Functionalities in Photonic Crystals

High-quality self-assembled three-dimensionally-ordered photonic crystals have been synthesized with inorganic and polymeric colloids. These crystals display a pseudo bandgap in the UV / visible / near-IR regions with high values of reflectance combined with low transmission. The stop band characteristics have been modified after infiltrating these passive photonic crystals with materials such as ZnO as well as by synthesizing active photonic crystals directly from colloids made of organic dye-polymer composites. The emission characteristics of these active species are modified by the photonic crystal    environment due to the anisotropic stop band. It has been possible to fabricate photonic crystal heterostructures as well as photonic crystal waveguides for building functionalities into photonic integrated circuits.  BJ93GJCCMXAR

2010 seminar topic Multi-wavelength and Broadband Optical Sources for Fiber-Optic Communication

Tunable lasers in the C and L bands of fiber-optic communication have been designed with erbium-doped fiber. Tunability has been achieved without using an intra-cavity filter, merely by changing the intro-cavity parameters in an appropriate manner. Also, mode-locking at GHz frequencies with a very simple economical design is a highlight of this work. The large tuning range possible in this design is further utilized in demonstrating a broadband source by introducing a dispersion shifted fiber as an intra cavity element. The multiple four-wave mixing processes occurring between the longitudinal modes in this fiber result in a spectral broadening throughout the gain spectrum of the EDF. This is a simple and elegant design to realize a tunable broadband source at pump powers less than 200 mW. The mechanism of broadband generation and the utility of the source for applications will be discussed.

Cusat Previous Years Question Papers B.Tech all branch

Civil Engineering Semester I Semester II Semester III Semester IV Semester V Semester VI Semester VII Semester VIII

Computer Science     Semester I Semester II Semester III Semester IV Semester V Semester VI Semester VII Semester VIII

Electrical and Electronics Engineering Semester I Semester II Semester III Semester IV Semester V Semester VI Semester VII Semester VIII

Electronics and Communication  Engineering Semester I Semester II Semester III Semester IV Semester V Semester VI Semester VII Semester VIII

Information Technology Semester I Semester II Semester III Semester IV Semester V Semester VI Semester VII Semester VIII

Mechanical Engineering Semester I Semester II Semester III Semester IV Semester V Semester VI Semester VII Semester VIII

Safety and Fire Engineering Semester I Semester II Semester III Semester IV Semester V Semester VI Semester VII Semester VIII

reference :http://dspace.cusat.ac.in

Cryptography

Security of information results from the need for Private transmission of messages. It is very essential that Security coverage should be provided to the computer systems, including to security to communication channels

Cryptography means hidden writing. Cryptography is used to protect information to which illegal access is possible and where other protective measures are inefficient

The basic idea in cryptography is to take a message in ordinary language, called plain text. This is transformed in some way to produce cipher text. The cipher text can now be sent to the correspondent. He uses another transformation to recover the plain text from the cipher text. The plain text is encrypted or hidden by the first transformation to obtain the cipher text. The cipher text is decrypted by another transformation to obtain the plain text once again. After encryption, cipher text can be transmitted over a data link or stored in a file

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CS & IT SEMINAR

• AUTOSAR
• BEHAVIORAL CLONING
• Boids
• CELL PHONE VIRUSES AND SECURITY
• Chatterbot
• Content Srambling System
• COOPERATIVE LINUX
• CYBORG
• Datagram Congestion Control Protocol (DCCP)
• DeCSS
• Distributed Quota Enforcement for Spam
• DNA AND DNA COMPUTING IN SECURITY
• Earth Simulator
• Electronic money
• Elliptical Curve Cryptography
• Extensible Firmware Interface
• Ferroelectric Random Access Memory
• Holographic Versatile Disc
• Intel Virtualization Technology
• Interactive Television
• INTERPLANETARY INTERNET
• IP Multimedia Subsystem (IMS)
• JAVA MANAGEMENT EXTENSION (JMX)
• MAGNATORESISTIVE RAM (MRAM)
• Mathematical markup languages
• MPEG-7
• NEW SENSOR TECHNOLOGY
• OpenRAN
• OVONIC UNIFIED MEMORY
• PLASMA PANEL DISPLAY
• Quantum dot cellular automaton
• QUANTUM DOT LASERS
• Real-time Transport Protocol
• Simultaneous Multithreading
• Simultaneous multithreading
• Software Radio
• SYMBIAN OS
• VoIP in Mobile Phones
• WIRELESS MESH NETWORKS
• ZFS Filesystem

ELECTRONICS SEMINAR TOPICS

• ADVANCED IC PACKAGING TECHNOLOGIES
• Asymmetric digital subscriber line(ADSL)
• Blu Ray Disc
• Blue Laser Could Lead to Autism Cure
• Bluetooth Based Smart Sensor Networks
• CELLULAR TECHNOLOGY
• CLUSTERING TECHNOLOGY
• Digital T.V
• Direct sequence code division multiple access (DS-CDMA)
• DLP Projector
• Dynode
• Efficient New Light Unfolds Like Paper
• Face Recognition Technology
• FLUORESCENT MULTILAYER DISC (FMD)
• HAVi
• Human Ear Inspires Universal Radio
• Hydrophone
• IDMA - Future of Wireless Technology
• Light Emitting Polymers
• Microbe-Powered 'Fart' Machine Stores Energy
• Microvia Technology
• MIDI
• Multimedia messaging Service
• OFDMA
• Organic LED
• Protein Memories for Computers
• Push Technology
• Quantum-dot Cellular Automata
• Single electron tunneling (SET) transistor
• Smart Dust
• Smart sensors
• Space Mouse
• Surface conduction Electron emitter Display (SED)
• Surface-conduction Electron-emitter Display (SED)
• Surround sound system
• Thermomechanical Data Storage
• Thin Displays
• Thought Translation Device
• Tunable lasers
• Ultra Conductors
• Virtual Keyboard
• Virtual Retinal Display
• VOICE MORPHING
• VoIP in Mobile Phones
• White LED
• Wibree
• Wireless LED