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CRC Press eBooks

Methods of slow light generation

Iraj Sadegh Amiri, Abdolkarim Afroozeh, H. Ahmad

Published Dec 8, 2016• 0 citations
Publisher

Abstract

This chapter presents the techniques of generating slow and fast pulse using micro-ring resonator (MRR). MRR systems made of different materials. Micro-ring device can be constructed with radius in the size of a micron. The chapter utilises the input power below and above threshold value to investigate the behavior of light pulse in term of linearity and nonlinearity. To generate slow light, series of ring resonators is used. In this method, the nonlinear effect of waveguide is neglected because of threshold power of nonlinear effect. Bright soliton and Gaussian beam can be used for three waveguide as input pulses. In this method chaotic signal can be canceled by neglecting nonlinear effects. All optical waveguide materials to generate slow and fast light should be dispersive. This means that the refractive index varies with wavelength. There are several ways to measure dispersion in materials.

DOI
10.1201/9781315682990-7

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In this study an interesting system in which a bright and dark soliton pulse can be stopped inside a nonlinear waveguide is presented. Here, we propose a system consisting of a series of ring resonators for optical trapping within a nonlinear waveguide. The bright and dark solitons can be controlled and slowed down within the waveguide. The FWHM for the output signals are calculated and used as an optical memory. Bright and dark soliton behaviors within a micro and nano ring resonator are also investigated and described. The required pulse is filtered and amplified, can be controlled and localized within the system. The localized bright and dark solitons are stopped by controlling the input power, which means that the photon stopping can be controlled by light in a ring resonator. Key words: Dark soliton; bright soliton; nonlinear nano waveguide; stopped light

Jurnal Teknologi•Mar 21, 2012•25 citations
This chapter presents the techniques of generating slow and fast pulse using micro-ring resonator (MRR). MRR systems made of different materials. Micro-ring device can be constructed with radius in the size of a micron. The chapter utilises the input power below and above threshold value to investigate the behavior of light pulse in term of linearity and nonlinearity. To generate slow light, series of ring resonators is used. In this method, the nonlinear effect of waveguide is neglected because of threshold power of nonlinear effect. Bright soliton and Gaussian beam can be used for three waveguide as input pulses. In this method chaotic signal can be canceled by neglecting nonlinear effects. All optical waveguide materials to generate slow and fast light should be dispersive. This means that the refractive index varies with wavelength. There are several ways to measure dispersion in materials.
Micro-ring resonators (MRRs) are employed to generate signals used for optical communication applications, where they can be integrated in a single system. These structures are ideal candidates for very large-scale integrated (VLSI) photonic circuits, since they provide a wide range of optical signal processing functions while being ultra-compact. Soliton pulses have sufficient stability for preservation of their shape and velocity. Technological progress in fields such as tunable narrow band laser systems, multiple transmission, and MRR systems constitute a base for the development of new transmission techniques. Controlling the speed of a light signal has many potential applications in fiber optic communication and quantum computing. The slow light effect has many important applications and is a key technology for all optical networks such as optical signal processing. Generation of slow light in MRRs is based on the nonlinear optical fibers. Slow light can be generated within the micro-ring devices, which will be able to be used with the mobile telephone. Therefore, the message can be kept encrypted via quantum cryptography. Thus perfect security in a mobile telephone network is plausible. This research study involves both numerical experiments and theoretical work based on MRRs for secured communication.
Micro-ring resonators (MRRs) are employed to generate signals used for optical communication applications, where they can be integrated in a single system. These structures are ideal candidates for very large-scale integrated (VLSI) photonic circuits, since they provide a wide range of optical signal processing functions while being ultra-compact. Soliton pulses have sufficient stability for preservation of their shape and velocity. Technological progress in fields such as tunable narrow band laser systems, multiple transmission, and MRR systems constitute a base for the development of new transmission techniques. Controlling the speed of a light signal has many potential applications in fiber optic communication and quantum computing. The slow light effect has many important applications and is a key technology for all optical networks such as optical signal processing. Generation of slow light in MRRs is based on the nonlinear optical fibers. Slow light can be generated within the micro-ring devices, which will be able to be used with the mobile telephone. Therefore, the message can be kept encrypted via quantum cryptography. Thus perfect security in a mobile telephone network is plausible. This research study involves both numerical experiments and theoretical work based on MRRs for secured communication.
An optical fiber consists of a transparent core surrounded by a transparent cladding material with a lower refractive index. Fibers which can be used for many propagation paths or transverse modes are called Multi-Mode Fibers whereas those which can only support a single mode are called Single Mode Fiber. Optical solitons are localized as electromagnetic waves that propagate in nonlinear media resulting from a balance between nonlinearity and linear broadening due to dispersion and/or diffraction. Ring resonators are employed to generate signals used for optical communication applications, where they can be integrated in a single system. A PANDA ring resonator can be used to generate chaotic signals. Slow light refers to the control of the light velocity in a particular medium. Slow light techniques can be used for future optical communication systems, including optical buffering, data synchronization and optical memories.
We proposed a new approach to generate slow light transmission with large bandwidth and high buildup factor by using a soliton pulse propagating within integrated ring resonator circuit. The system consisted series of micron-size ring resonator fabricated by using nonlinear InGaAsP/InP material that are laterally coupled together. For convenience of analysis, optical transfer function for this model is obtained by using z-transform method. Slow light performances were modeled and discuss in this paper. Intensity buildup induced within the series of rings located at left and right sides of the system while strong nonlinear Kerr effect and mutual coupling leads to the spreading frequency bands within the device. Numerical simulation verifies that signal pulse with 45 ps relative delay time and bandwidth of 5.9 GHz (47 pm) are obtained at the communication wavelength around 1550 nm for a 100 ps signal pulse.
We propose a novel design of optical buffer to generate slow light based on delay time. In the framework of the nonlinear waveguide, we investigate propagation of solitons through microring resonators. Dynamical control over slow-light solitons is realized via controlling fields generated by bright soliton and Gaussian pulse. The nonlinear dependence of the velocity of the signal on the controlling field is analytically described. The buffering effect is achieved by slowing the optical signal using an external control light source to vary the dispersion characteristic of the medium via microring resonators. A graphical approach with a signal flow graph method is used to derive the optical transfer functions in z-domain of filters. The characteristics of the optical buffer devices including the transmittance and time delay of the through and drop port are simulated. Simulated results show the criteria of achieving slow light in semiconductor microring resonators. Finally, output signal shows the delay time rate by propagation through the semiconductor microring resonators.
In this study an interesting system in which a bright and dark soliton pulse can be stopped inside a nonlinear waveguide is presented. Here, we propose a system consisting of a series of ring resonators for optical trapping within a nonlinear waveguide. The bright and dark solitons can be controlled and slowed down within the waveguide. The FWHM for the output signals are calculated and used as an optical memory. Bright and dark soliton behaviors within a micro and nano ring resonator are also investigated and described. The required pulse is filtered and amplified, can be controlled and localized within the system. The localized bright and dark solitons are stopped by controlling the input power, which means that the photon stopping can be controlled by light in a ring resonator. Key words: Dark soliton; bright soliton; nonlinear nano waveguide; stopped light