Introduction to optical amplifiers 417 a raman amplifier is distributed over a long span of optical fiber. Click download or read online button to get optical amplifier technology systems book now. The basic working principle of an soa is the same as a semiconductor laser but without feedback. Semiconductor laser basics free download as powerpoint presentation. During operation as an optical amplifier, light is coupled into the waveguide at z 0. Soa semiconductor optical amplifier model simulation with. In this way, a raman amplifier can be combinedfa booster or inlineed with a n.
Semiconductor optical amplifier soa with the growing popularity and usage of optical technology in the field of telecommunication, there is a critical need for more reliable signal transmission optical channels. Dqpsk options design kits publications download brochure request evaluation. Semiconductor optical amplifier soa similar to a laser cavity. Semiconductor optical amplifierbased alloptical gates.
The model includes the effects of endfacet reflections and. Semiconductor laser amplifiers as alloptical frequency. Semiconductors, diodes, transistors horst wahl, quarknet presentation, june 2001 electrical conductivity. With the progress of optical transmission technology, various kinds of semiconductor lasers have been developed for the application to wavelength division multiplexing, high speed, low power consumption, and photonic integration. The input power dynamic range is studied and especially the impact of the soa alpha factor is addressed. Small edgeemitting laser diodes generate a few milliwatts or up to 0. Semiconductor lasers types, applications, construction. A large signal input power is considered in this case, since high signal input helps to produce high output power, which is necessary to boosterpower amplifiers. A model for the noise processes in a fabryperot semiconductor laser amplifier is presented. Rp photonics encyclopedia semiconductor lasers, laser diodes. Automatic gain controlled semiconductor optical amplifiers. Semiconductor lasers, 2nd edition agrawal, govind p.
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. Alloptical frequency conversion of an optical data signal can be achieved by a travelingwave semiconductor laser amplifier over a spectral range given by its entire gain spectrum 1o thz. Abstractsemiconductor optical amplifiers are useful building. Pdf modulation response of a semiconductor laser amplifier. The input beam from a single spatial mode, low power master oscillator was injected into a laser diode amplifier using microscope objectives and. Pdf semiconductor optical amplifiers and their applications. This eliminates the painstaking process of aligning the seed laser beam into the front facet of the tapered amplifier chip and ensures that your system is always aligned, allowing for superior power stability. Eindhoven university of technology master automatic gain. Impact of travelling wave semiconductor optical amplifier on wdmfso system under fog attenuation.
Very large optical bandwidth up to 150nm polarization independent. Describe how a semiconductor laser diode works a semiconductor laser diode consists of several parts. We find a resonance behavior similar to the wellknown relaxation oscillation resonance found in. Semiconductor and simple circuitsnot to be republished. Semiconductorlaser amplifier as an optically controlled switch.
Semiconductor lasers have important applications in numerous fields, including engineering, biology, chemistry and medicine. Pdf travelling wave semiconductor laser amplifier detector noise. Soas amplify incident light through stimulated emission. Electrical drive current weak optical signal in ar ar amplified optical signal semiconductor cavity. An optical data signal is switched on and off with an extinction ratio of 10 db when an optical control signal is turned on and off. We present a theoretical analysis of the modulation response of a semiconductor laser amplifier.
Semiconductor laser is well suited for interface with fiber optic cables used in communication. Linear semiconductor optical amplifiers for amplification of. Semiconductor optical amplifier soa simulation with picwave and harold software. Soa due to the power dependent gain lead to the develop ment of linear optical amplifiers. A microisolator between the oscillator and the amplifier suppresses optical feedback. This optical gain is due to stimulated emission associated with light emission created by recombination of electrons and holes. Choose a web site to get translated content where available and see local events and offers. Elantec, alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, and other semiconductors. Our results show that the advantage of a lower alphafactor soa decreases for higherorder modulation formats. Jan 03, 2011 solidstate lasers have been demonstrated as attractive drivers for inertial confinement fusion on the national ignition facility nif at lawrence livermore national laboratory llnl and at the omega facility at the laboratory for laser energetics lle in rochester, ny.
Microintegrated 1 watt semiconductor laser system with a linewidth of 3. The original concepts of semiconductor lasers dates from 1961, when basov et al. Energy gains over 17 db 12 db are obtained for 1 mw 20 mw of average input power when the input pulses are stretched into the picosecond range. Semiconductor laser diode outline this student project deals with the exam question semiconductor laser diode and covers the following questions. Optical gain is the most important requirement for the realization of a semiconductor laser because it describes the optical amplification in the semiconductor material. Laser structure and principle of operation laser diodes consist of a n diode with an active region where electrons and holes recombine p resulting in light emission. Users may download and print one copy of any publication from the public portal for. The laser cavity consists of a waveguide terminated on each end by a mirror. When the light traveling through the active region, it causes these electrons to lose energy in the form of photons and get back to the ground state. They can be integrated into arrays of amplifying switching and. An optical amplifier is a device that amplifies an optical signal directly, without the need to first convert it to an electrical signal.
Semiconductor laser power amplifier, proceedings of spie. As the light propagates inside the waveguide it gets amplified. The model includes the effects of endfacet reflections and the backwardstravelling wave into the amplifier. Solidstate lasers have been demonstrated as attractive drivers for inertial confinement fusion on the national ignition facility nif at lawrence livermore national laboratory llnl and at the omega facility at the laboratory for laser energetics lle in rochester, ny. For power plant applications, these lasers must be pumped by semiconductor diode lasers to achieve the required. Pdf semiconductor optical amplifiers in photonic switching. We demonstrate a compact, narrowlinewidth, highpower, microintegrated semiconductor based master oscillator power amplifier laser module which is implemented on a footprint of 50 x 10 mm2.
This model is based on the application of perturbation techniques to the travellingwave rate equations for the amplifier. Characterization of a highpower tapered semiconductor. Users may download and print one copy of any publication from the public portal for the purpose of. Antireflection coatings deposited on the facets of semiconductor lasers effectively suppress any selfoscillation. Tapered semiconductor amplifiers for optical frequency. An expression for the linewidth of the cascade of a laser diode and an optical amplifier has been derived earlier by berglind and nilsson 4 using a circuit. In addition, a laser diode contains an optical cavity where stimulated emission takes place. Users may download and print one copy of any publication from the public portal for the. The system is based on a tapered semiconductor gain element, which amplifies the output of a narrowlinewidth diode laser. The basic equations defining laser amplifier characteristics are presented. Modulation response of a semiconductor laser amplifier article pdf available in ieee journal of selected topics in quantum electronics 53. Oct 04, 20 the semiconductor laser amplifier nptelhrd.
It is essentially like a laser diode where the end mirrors have been replaced with antireflection coatings. Semiconductor optical amplifiers in photonic switching 15697. A tapered semiconductor amplifier is injection seeded by a femtosecond optical frequency comb at 780 nm from a modelocked ti. Development of semiconductor laser for optical communication. Leisher the semiconductor laser was invented in 1962, and has recently become ubiquitous in modern life. Doped semiconductors ntype materials ptype materials diodes and transistors.
Semiconductor optical amplifiers soas 9 and planar waveguide based optical amplifiers 10 were pursued aggressively. The oscillator is a distributed bragg reflector laser optimized for narrowlinewidth operation and the amplifier. Typical performance of 2 mm long qdsoa alfree quantum dash semiconductor optical amplifier, based on buried ridge stripe technology wide optical bandwidth. An optical amplifier may be thought of as a laser without an optical cavity, or one in which feedback from the cavity is suppressed. Semiconductor laser diode pumps for inertial fusion energy. We have characterized a semiconductor amplifier laser system which provides up to 200mw output after a singlemode optical fiber at 780nm wavelength. The application of a semiconductorlaser amplifier with reduced facet reflectivity as alloptical switch is described. Finding application in all optical 3rregeneration systems. For power plant applications, these lasers must be pumped by semiconductor diode lasers to achieve the required laser.
From cost point of view the semiconductor lasers are economical. There is a great variety of different semiconductor lasers, spanning wide parameter regions and many different application areas. We demonstrate a compact, narrowlinewidth, highpower, microintegrated semiconductorbased master oscillator power amplifier laser module which is implemented on a footprint of 50 x 10 mm2. Apr 27, 2011 certificate by the supervisorthis is to certify that this technical report performance of semiconductor optical amplifier is a recordof work done by pranab kumar bandyopadhyay, md. Fast and robust method for measuring semiconductor optical. They can be integrated into arrays of amplifying switching and gating devices. Holstlaan 4, 5656 aa eindhoven, the netherlands abstract progress in longwavelength strained compressive and tensile ingaasp quantum well. This site is like a library, use search box in the widget to get ebook that you want. Read semiconductorlaseramplifierbased integrated interferometers for adddrop multiplexing in otdm systems, proceedings of spie on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. Strainedlayer ingaasp quantum well semiconductor lasers. The application of a semiconductor laser amplifier with reduced facet reflectivity as alloptical switch is described. The two optical signals are polarized perpendicularly to each other.
This thesis focuses on the development of a semiconductor laser fabricating process which utilizes semiconductor manufacturing technology in a. They form the backbone of the optical telecommunications infrastructure supporting the internet, and are used in information storage devices, barcode scanners, laser printers and many other everyday products. Intensity noise and linewidth of laser diodes with integrated. The amplifier market game changer is the same today as it was almost 10 years ago. Picwave can be used in combination with harold to model an semiconductor optical amplifier soa in the timedomain. Basic semiconductor physics, diodes, the nonlinear diode model, load line analysis, large signal diode models, offset diode model, transistors, large signal bjt model, load line analysis, small signal model and transistor amplification. Osa microintegrated 1 watt semiconductor laser system with. Based on your location, we recommend that you select. Describe how a semiconductor laser diode works what determines the frequency that is emitted. A semiconductor optical amplifier is an optical amplifier based on a semiconductor gain medium.
Every vamp tapered amplifier features a permanently aligned fibercoupled fcapc input port. Smaller size and appearance make them good choice for many applications. However, after 1990, a few semiconductor devices using organic semiconductors and semiconducting polymers have been developed signalling the birth of a futuristic technology of polymerelectronics and molecularelectronics. Semiconductor optoelectronics farhan rana, cornell university p p p p np n v the number of photons leaving the cavity from the mirrors is therefore, p p p o p p o n n v the output power p of the laser is. Wide stripe semiconductor lasers can be used as optical power amplifiers for obtaining high power single spatial mode output beams. Pdf microintegrated 1 watt semiconductor laser system. Experimental and theoretical results for the frequency conversion efficiency are presented. Fabrication and characterization of edgeemitting semiconductor lasers dr. Model for noise processes in semiconductor laser amplifiers. Many types of diode are used for a wide range of applications. Semiconductor optical amplifier model file exchange. Materials, devices and simple circuits semiconductors.
Investors and technologists alike believed that the market would need small amounts of amplification for a large number of applications. Metal contact ptype material active region ntype material ntype material metal contact from the picture one can see, that in principle you have the same structure like a diode where you. Certificate by the supervisorthis is to certify that this technical report performance of semiconductor optical amplifier is a recordof work done by pranab kumar bandyopadhyay, md. Semiconductor laser iii single frequency lasers duration. Diodes and transistors pdf 28p this note covers the following topics. Schawlow with a ruby laser, 1961 semiconductors can be used as small, highly e cient photon sources in lasers.