However, raman optical amplifiers are based on stimulated raman scattering srs to create optical gain, which is a different phyical principle than edfa or conventional lasers. The electronic and optical properties of a semiconductor structure are strongly dependent on its density of states for the carriers. Typically, the optical pump is introduced at the end of a length of fiber in order to provide optical gain that increases towards the end of the fiber. The first part of this thesis is dedicated to the study of the physics of the fourwave mixing fwm optical nonlinearity in semiconductor optical amplifiers soas. The results for a sample system are computed and analyzed in this section. Investigation of wavelength conversion by fourwave mixing in. When photons light travel through the acve region it can cause these electrons to lose some of their extra energy in the form of. This thesis is mainly concerned with the use of hybrid optical amplifiers in multichannel wavelength division multiplexing wdm optical communication system and network.
Amplifier types there are three most important types of optical amplifiers. May 25, 2015 an optical amplifier is a device that amplifies an optical signal directly, without the need to first convert it to an electrical signal. View sample datasheet pdf specifications spectrum pin configuration. Nyquist wdm for ftth applications using reflective. Optical technology is the dominant carrier of global information. Alloptical processing for ultrafast data networks using semiconductor optical amplifiers jade p. The objective of this thesis is to study output orthogonality and nonlinear polarization rotations in the nodes of the opmigua network. Polarization effects in wavelength converters based on. The optical source provides the electricaloptical conversion may be either a semiconductor laser ld or light emitting diode led. In this way, a raman amplifier can be combinedfa booster or inlineed with a n. Eth zurich presented by andrej titus marculescu dipl. It is also central to the realisation of future networks that will have the capabilities demanded by society. Spectroscopy and wavelength conversion by fourwave mixing in. A study of the origin and applications of nonlinear.
Optical amplification is produced by the process ofstimulated emission induced by a population inversion in a lasing medium. This thesis explores the potential of the slabcoupled optical waveguide scow semiconductor gain medium for use in high power optical amplifiers and external cavity lasers. The technology of semiconductor amplifiers competes with that of erbiumdoped fiber amplifiers edfas. The static and dynamic properties of these amplifiers are discussed extensively in. Mar 18, 2016 the optical source provides the electrical optical conversion may be either a semiconductor laser ld or light emitting diode led. Their high gain and low noise figure provide a unique high performance, compact and low cost amplification solution to s and l band receiver subsystems. These capabilities include virtually unlimited bandwidth to carry communication services of almost any kind, and full transparency that allows terminal upgrades in. Berg quantum dot semiconductor optical amplifiers physics and applications ph.
This thesis is concerned with the study of characteristics of commercial semiconductor optical amplifierssoas and their employment in gpons for the purpose of packet equalization of upstream bursts in order to provide additional loss budget. Application and study of multifunctional semiconductor. The input power dynamic range is studied and especially the impact of the soa alpha factor is addressed. Semiconductor optical amplifiers soa have been widely used in communications systems for decades, in a multitude of capacities. Studies on placement of semiconductor optical amplifiers in. Ultrafast all optical signal processing using semiconductor optical amplifiers citation for published version apa. Semiconductor optical amplifiers soa a semiconductor optical amplifier is. Alloptical logic gates using semiconductor jae hun kim et al. The aim of investigation is to increase the transmission distance and amplify broad bandwidth optical networks by optimizing hybrid optical amplifiers. Text or symbols not renderable in plain ascii are indicated by. Development of semiconductor laser for optical communication. In their simplest form soas offer cost effective linear amplification at a variety of wavelengths, simultaneously covering a large gain bandwidth, with the added benefit of practical photonic integration.
The two main optical amplifier types can be classified as semiconductor optical amplifiers soas and dopedfiber amplifiers dfas. Analysis and characterization of slabcoupled optical. Gain control in semiconductor optical amplifier enlighten. Our line of benchtop optical amplifiers includes ytterbiumdoped fiber amplifiers ydfas, a praseodymiumdoped fluoride fiber amplifier pdfa, and erbiumdoped fiber amplifiers edfas. The transmission medium consists of an optical fiber cable and the receiver consists of an optical detector which drives a further electrical stage and hence provides demodulation of the optical carrier. The use of these different structures as active regions in semiconductor amplifiers results in different performance characteristics because of the differences in their density of states as shown in figure 6. Alloptical signal regeneration based on gainclamped. An optical pre amplifier is used at the end of the optical fiber link in order to increase the sensitivity of an optical receiver.
Semiconductor optical amplifier and coding in ook system. The concept of extending the reach of gpon through. An optical amplifier may be considered as a laser without an optical cavity, or one in which feedback from the cavity is suppressed. Fabry perot amplifiers fpa when the light enters fpa it gets amplified as it reflects back and forth between the mirrors until emitted at a higher intensity. Additional loss budget is aimed at facilitating the extension of gpons to provide not only longer distance between central office and end user, but is. Time domain simulation of optical amplifiers incorporating.
All optical processing for ultrafast data networks using semiconductor optical amplifiers jade p. Fourwave mixing fwm in semiconductor optical amplifiers soas is investigated for wavelength conversion in highspeed, all optical networks. Semiconductor optical amplifiers for ultrawideband optical systems. Semiconductor optical amplifier at 915nm, 980nm, 1060nm, 10nm, and 1550nm in 14pin butterfly package. Quantum dot semiconductor optical amplifiers physics and.
Thorlabs also offers a benchtop erbiumdoped fiber link amplifier developed by our strategic partner. This post is going to help you get a better understanding of optical amplifier. I will talk about semiconductor optical amplifiers soas and er doped optical amplifiers in this thesis, and focus on the er doped gan amplifiers 69. Optical amplifiers download ebook pdf, epub, tuebl, mobi. Semiconductor optical amplifiers to extend the reach of. Design and simulation for the fabrication of integrated semiconductor optical logic gates by aleksandra markina s. A steadystate numerical model of wavelength converters based on crossgain soas is developed. Optical amplifier, with the introduction in the 1990s, conquered the regenerator technology and opened doors to the wdm technology. These semiconductor optical amplifiers are primarily intended for use as optical preamplifiers in high bit rate systems 2. It is sensitive to temperature and input optical frequency. Rare earth doped fiber amplifiers erbium edfa 1500 nm, praseodymium. They combine in a single element the possibilities of amplification and modulation of an optical signal. Modelling and characterization of laterallycoupled distributed feedback laser and semiconductor optical amplifier by julie efiok nkanta thesis submitted to the faculty of graduate and postdoctoral studies in partial fulfillment of the requirements for the doctor of philosophy degree in physics department of physics.
The results contained in this thesis have not been submitted either in part or in full to any other. This thesis examines the unique properties of gallium arsenide gaasbased quantumdot semiconductor optical amplifiers for optical communication networks, introducing readers to their fundamentals, basic parameters and manifold applications. Pdf on aug 3, 2003, michael connelly and others published semiconductor optical amplifiers and their applications find, read and cite all. Berceli tibor budapest university of technology and economics department of broadband infocommunications and electromagnetic theory 2009, budapest introduction. Eng school of electronic engineering faculty of engineering and computing dublin city university research supervisor. Overlapping signal a with signal b produces an output signal with the pattern 0100, which is the correct proof for characteristics of an and logic gate. Severine philippe, polarisation effects in semiconductor optical amplifiers, thesis, trinity college dublin, ireland. Ultrafast alloptical signal processing using semiconductor optical amplifiers. An optical amplifier may be thought of as a laser without an optical cavity, or one in which feedback from the cavity is suppressed. Introduction to optical amplifiers 417 a raman amplifier is distributed over a long span of optical fiber. The setup is much more compact, containing only a small semiconductor chip with electrical and fiber connections. In this thesis several solutions to the challenges of wavelength conversion at.
Slow and fast light effects in semiconductor optical amplifiers for applications in. The second part presents investigations of fwm applications in the context of high. In this paper we present an overview of all optical generation of vestigial sideband vsb signals based on selfphase modulation spm in semiconductor optical amplifiers soa at 10 gbs and 40. An optical amplifier is a device that amplifies an optical signal directly, without the need to first convert it to an electrical signal. The capability of semiconductor optical amplifiers soa to amplify advanced optical modulation format signals is investigated. The chapter is dedicated to the basics and key parameters of semiconductor optical amplifiers soas. Optical amplifiers venkat venkataramanan instute for opcal.
It is mainly used to amplify an optical signal directly, without the need to first convert it to an electrical signal. The thesis begins by introducing the scow concept and describing the benefits of utilizing a low optical confinement design for high power operation. Design and experimental characteristics of an erbium doped. For improving optical output power of the laser mod ule, the polarization and the wavelength multiplexing were also used. Nyquist wdm for ftth applications using reflective semiconductor optical amplifiers 2.
Optical amplifiers are important in optical communication and laser physics. Slow and fast light effects in semiconductor optical. Semiconductor optical amplifier an electrical current is passed through the device that excites electrons in the acve region. Investigation of wavelength conversion by fourwave mixing. Semiconductor optical amplifiers research collection eth zurich. Aug 11, 2017 the basics of semiconductor optical amplifier soa soa optical amplifiers use the semiconductor as the gain medium, which is designed to be used in general applications to increase optical launch power to compensate for the loss of other optical devices. Introduction to semiconductor optical amplifiers soas. Semiconductor optical amplifiers soas have found widespread use in optical communications covering the important telecommunications window with optical carrier wavelengths from 1. Semiconductor optical amplifiers there are two types of soas. Chapter 3 wavelength conversion through crossgain modulation in semiconductor optical amplifiers. There are many types of optical amplifiers, namely raman amplifiers, erbium doped fiber amplifiers edfas, and semiconductor optical amplifier soa.
Following a comprehensive overview of the components of optical communication systems a pon is introduced and the standard of gigabitpon gpon explained. Application and study of multifunctional semiconductor optical amplifier in subcarrier multiplexed optical networks phd thesis gerhatne udvary eszter supervisor. Alloptical logic gates using semiconductor opticalampli. In this paper we present an overview of alloptical generation of vestigial sideband vsb signals based on selfphase modulation spm in semiconductor optical amplifiers soa at 10 gbs and 40.
Products amphotonix semiconductor optical amplifiers. Design and simulation for the fabrication of integrated. New pumping methods and materials are also improving the performance of raman amplifiers. The design of the wavelength converter is optimized and the system performance limitations imposed by the fundamental physical principles involved in the soa fwm process are characterized. Semiconductor optical amplifiers booster optical amplifiers are amplifiers which use a semiconductor to provide the gain medium. Modeling, signal regeneration and conversion a thesis submitted to attain the degree of doctor of sciences of eth zurich dr. Rp photonics encyclopedia semiconductor optical amplifiers, soa. Ultrafast alloptical signal processing using semiconductor. Semiconductor optical amplifiers soas fiber raman and brillouin amplifiers rare earth doped fiber amplifiers erbium edfa 1500 nm, praseodymium pdfa 0 nm the most practical optical amplifiers to date include the soa and edfa types. Semiconductor optical amplifiers the polarization sensitivity of mqwsoas can be signi. Final thesis paper digital optical fiber link design. Slow and fast light effects in semiconductor optical amplifiers for. Slow and fast light effects in semiconductor optical amplifiers for applications in microwave photonics xue, weiqi publication date.
Our results show that the advantage of a lower alphafactor soa decreases for higherorder modulation formats. Ultrafast all optical signal processing using semiconductor optical amplifiers. Spectroscopy and wavelength conversion by fourwave mixing. This thesis is concerned with the study of characteristics of commercial semiconductor optical amplifiers soas and their employment in gpons for the purpose of packet equalization of upstream bursts in order to provide additional loss budget. Reflective soa in optical communication, rsoas have major advantages compared to traditional photonic devices. Eindhoven university of technology master automatic gain. A study of the origin and applications of nonlinear polarization rotation in semiconductor optical amplifiers a thesis for the degree of doctor of philosophy presented to dublin city university dcu by brendan f. We focus our attention on the polarization properties of fwm and spectroscopic measurements of ultrafast carrier dynamics in these amplifiers. It applies to semiconductor optical amplifiers or erbium doped fiber amplifiers. Demonstrating effective alloptical processing for ultrafast. This thesis reports on semiconductor optical amplifiers soas and their use in optical communication systems. Studies on placement of semiconductor optical amplifiers.
Pdf semiconductor optical amplifiers and their applications. This thesis study focuses on automatic gain control applied on semiconductor optical amplifiers soas. Thorlabs optical amplifiers are available as complete benchtop systems or as pigtailed butterfly packages. Ultrafast alloptical signal processing using semiconductor optical amplifiers citation for published version apa. In these nodes wavelength converters based on semiconductor optical amplifiers converts two orthogonal states of polarization to the desired wavelength. The design of the wavelength converter is optimized and the system performance limitations imposed by the fundamental physical. Optical amplifiers are used to create laser guide stars which provide feedback to the adaptive optics control systems which dynamically adjust the shape of the mirrors in the largest astronomical telescopes. The input and output signals are con gured in figure 2. A general introduction to semiconductor gain media as well as theory of interaction of light and semiconductors is given including fundamental physical concepts and properties. The concept of extending the reach of gpon through the.843 1288 1079 1283 496 1065 43 193 1249 946 353 532 174 999 549 228 1336 1179 1221 1272 1121 32 1173 184 207 1206 200 286 1533 296 155 1143 249 406 1233 273