Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 33 for “"add-drop"”.
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Fabrication of a planar optical add/drop channel filter in silicon oxynitride
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.
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Crosstalk and Signal Integrity in Ring Resonator Based Optical Add/Drop Multiplexers for Wavelength-Division-Multiplexing Networks
… thesis has focused on the crosstalk in Optical Add/Drop Multiplexers (OADMs) as an EMC problem. The main research question is: “How can signal integrity be improved and crosstalk effects mitigated in small-sized OADMs in order to enhance the optical EMC in all-optical networks and contribute to …
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Integrated optical filters using Bragg gratings and resonators
… Bragg resonators. Various topologies for making add/drop filters using integrated gratings are outlined. Each class of devices is studied in detail and the theoretical tools needed for designing the add/drop are developed. First-order filters using Bragg resonators do not meet WDM add/drop filter …
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Accurate nanofabrication techniques for high-index-contrast microphotonic devices
… nanofabrication techniques are developed to address the two main challenges in fabrication of high-index contrast microphotonic devices: sidewall roughness and dimensional accuracy. The work focuses on fabrication of optical add-drop filters based on high-index contrast microring-resonators. …
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Polarization independent microphotonic circuits
… these microphotonic circuits is the optical add/drop multiplexer which requires polarization independence to mate to the standard single-mode fiber forming today's optical networks. Herein, we present the results of an effort to circumvent the polarization dependence of a microphotonic …
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Opto-VLSI based WDM multifunction device
… However, crucial components of DWDM networks – add/drop multiplexers, filters, gain equalizers as well as interconnects between optical channels – are currently not implemented as dynamically reconfigurable devices. Electronic cross-connects, the traditional solution to the reconfigurable …
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Novel all-optical switching and processing techniques for optical networking
… than the other domain. For example, channel add/drop multiplexing can be performed directly by passive filtering in the spectral domain. An investigation into the switching of the linearly-chirped pulses in a nonlinear optical loop mirror (NOLM) revealed that the product of the control-pulse …
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Athermal photonic devices and circuits on a silicon platform
… core by negative TO effects of the polymer cladding. In addition, the design rule involves engineering the waveguide core geometry depending on the resonance wavelength under consideration to ensure desired amount of light in the polymer. We develop exact design requirements for a TO peak …
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All optical systems for terabit network era
… reasonable power consumption and cost. In addition, when point-to-point links are approaching the fundamental limit of standard fiber, the efficient use of the entire transmission window for optical networks will only be achieved through flexible superchannels compatible with flexible …
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Materials and devices for optical switching and modulation of photonic integrated circuits
… platform. Optical switching: fast modulation and add-drop switches, key components in a PIC, were investigated. A MEMS-based approach was utilized to control switching in planar ring resonator waveguide structures. A switch extinction ratio of 15 dB, switch speed of 60 is and 1 mW operating power …
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Opto-VLSI processing for reconfigurable optical devices
… with photonics enables intelligence to be added to the high-speed capability of photonics, thus realising reconfigurable optical devices which can revolutionise optical telecommunications and many more application areas. In this thesis, we investigate and demonstrate the capability of …
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Integrated optical switching using titanium nitride micro electromechanical systems
… (MEMS). The device consists of a ring resonator add-drop filter and a conductive MEMS bridge which is actuated by electrostatic force. Introducing conductive material into the electromagnetic evanescent field of the ring waveguide results in loss in the propagating light within, disabling the …
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Passive components for dense optical integration based on high index-contrast
… are presented, specifically: a class of resonant add/drop filters that rely on symmetry and degeneracy of modes, low-loss right-angle bends, splitters, crossings based on transmission cavities, and fiber-chip couplers based on cascades of resonators or lensing mechanisms. Their operating …
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Theory and design of high-index-contrast microphotonic circuits
… the first telecom-grade microphotonic channel add-drop filters are demonstrated, including novel, dispersion-free switchable and widely tunable designs. Several new classes of optical devices are proposed. The first, universally balanced interferometers, enable filters capable of "fully …
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Advanced fibre Bragg grating structures: design and application
… applications and Bragg gratings for add-drop applications in high bit-rate systems. Development of the fabrication-technique developed and analysed as a part of this work has led to a number of experimental 'firsts', including the meter-long Bragg gratings with …
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Studies of advanced integrated nano-photonic devices in silicon
… configurations), reconfigurable optical add-drop multiplexers (ROADMs) with telecom-grade specifications, and a dynamical slow light cell for delay lines and optical memory elements. All the devices demonstrated in this thesis can be integrated on the same chip. The small device …
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Bragg grating filters for optical networks
… tunable distributed feedback fibre laser, add-drop multiplexer and high power fibre laser.<br/>Finally, we present a package for varying the dispersion of a fibre grating. The<br/>package deforms a beam into a cubic function shape with a contra-flexure point at the middle. Consequently, …
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Investigation of performance issues affecting optical circuit and packet switched WDM networks
… network elements such as reconfigurable optical add/drop multiplexers (ROADMs) and optical cross connects (OXCs) now being deployed along with the generalized multiprotocol label switching (GMPLS) control plane this represents the current state of the art in commercial networks. These networks …
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Low Loss Integrated Photonic Devices and Their Applications in Astrophotonics and Quantum Information
… crosstalk (<-30dB). We demonstrate an on-chip add-drop filter working on arbitrarily spaced five channels based on the complex waveguide Bragg gratings and the multimode interferometer (MMI). A more than 40 dB extinction ratio is achieved in all five channels and the device is shown to be low …
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Integration of glass microspheres and planar waveguides for microsphere lasers
… applications such as the narrow band filter, add-drop multiplexer, microlasers, and etc. In this work, the integration of microspheres with planar waveguides is the main focus. High quality neodymium-doped BK7 microspheres are fabricated and characterised to observe laser oscillation at 1.06 …
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