Chung2 1photonicwireless convergence components research department, electronics and telecommunications research institute, 8 gajeongno, yuseonggu, daejeon, south korea. So far, the pic was driven with an rf probe, using a coaxial bias tee to combine. Pdf electroabsorption dynamics in an ingaaspingaasp. Pdf 40gbs low chirp electroabsorption modulator integrated. The ea modulator device is located in the optoelectric library. Electroabsorption modulator performance predicted from. Simulation of traveling wave electroabsorption modulators for. Electroabsorption modulator ii device configuration. Pdf a 40gbs monolithically integrated transmitter containing an ingaasp. Improvement of modulation bandwidth in electroabsorption.
By combining 5 with 6, the photocurrent can be rewritten. Figure 1a shows a finished device illustrating the proposed integration. Balanced electroabsorption modulator for highlinearity, low. Sorger1, 1department of electrical and computer engineering, george washington university, 800 22nd st. Simulation of traveling wave electroabsorption modulators for phase modulation prasanna ramaswamy promotors. For achieving a high extinction ratio, one usually exploits the quantumconfined stark effect in. For the love of physics walter lewin may 16, 2011 duration. Pdf we present an electroabsorption modulator based on the enhanced electrooptic effect of an asymmetric coupled triple quantum well actqw to. Circuit parameters extracted from measured s 11 values for an mqw eam are used to model. Coldren b a apogee photonics, 6580 snow drift road, suit 100, allentown, pa. Opticallyswitched dualdiode electroabsorption modulator. The demonstrated device has a compact active region of 1. Modeling of machzehnder and electroabsorption modulator.
You can print just what they need and place it in their binder alongside the current music selections, or they can prop up a mobile device and view transitions on a whim. Travelingwave electroabsorption modulators by shengzhong zhang the transmission bit rates in backbone telecommunication optical fibers are increasing rapidly, motivated by the explosive growth of internet traffic. With this model, it is possible to analyze dynamic characteristics depending on optical feedback and spatial hole burning. Dipartimento di elettronica, politecnico di torino, corso duca degli abruzzi 24, i10129 torino, italy. Electroabsorptionmodulated dfblaser ready to attack 10 gbits market introduction electroabsorption modulator integrated with a dfblaser diode eailm is now a wellestablished technology for 2. The modulator has a broad operating wavelength range of 35 nm and a 3 db. This generation can be accounted for in the con tinuity equations 2 and 3 a coupling of the electrical section 2 and the optical system just mentioned can be realized this way. High speed electroabsorption modulator in the generic. Electroabsorptionmodulated dfb laser ready to attack 10gbit. Systems combining photonics and electronics components may see improved performance.
Electroabsorption modulator performance predicted from bandedge absorption spectra of bulk, quantumwell, and quantumwellintermixed ingaasp structures gordon b. Digital coherent transmitter using electroabsorption. Where to buy electroabsorption modulators, eam, telecom. Ingaasingaasp mqw electroabsorption modulator integrated.
We report a novel hybrid integrated optic device consisting of algainasinp electroabsorption modulators and a fourarm silicaonsilicon planar lightwave circuit optical interferometer. Monolithic integration of an electroabsorption modulator into a gaasbased duocavity vcsel for resonancefree modulation j. Simultaneous modulation of several wdm channels using a. Electroabsorption modulator vertically integrated on a vcsel using low per. Electroabsorption modulator performance predicted from band. Miller1 1department of electrical engineering, stanford university, stanford, ca 94305, usa 2current. The characterization of an integrated electroabsorption modulator with distributedfeedback laser is presented. Modeling of machzehnder and electroabsorption modulator pulse generators and extraction of the chirp factor michael j. Simultaneous modulation of several wdm channels using a single electroabsorption modulator. Schaevitz,2 emel tasyurek,1 yiwen rong,3 theodore i.
Electroabsorption modulator eam electroabsorption modulator has been a very common device used in optical communication on the pure iiiv platform over the past decade. It has 2 electrical ports for the bias and rf driving and 2 optical ports as an input and output. In order to compare the proposed beam link to the xmzm link, we define an equivalent v. Applying a negative voltage bias on the ito layer, carrier accumulation occurs at both dielectricito interfaces, which dramatically changes the guided mode properties due to the epsilonnear. Both manufacturers and distributors can be registered. Pmgi bridges are formed on both ends of the optical waveguide to connect grounds from dierent sides of the optical waveguide. Index termselectroabsorption modulator, optical loss, photo current, saturation. Electroabsorption dynamics in an ingaaspingaasp superlattice modulator. Pmgi bridges are formed on both ends of the optical waveguide to connect grounds from di.
N2 fabrication and basic characteristics of a new structure ingaasingaasp mqw electroabsorption modulator integrated with a distributed feedback dfb laser are presented. Change optical path length with applied electric field. Electroabsorption modulated dfblaser ready to attack 10 gbits market introduction electroabsorption modulator integrated with a dfblaser diode eailm is now a wellestablished technology for 2. The modulator has a broad operating wavelength range of 35 nm and a 3 db bandwidth of 40. Electroabsorption modulators act by using a change in electric field across a material to change the optical.
Circuit parameters extracted from measured s 11 values. Oct 04, 20 for the love of physics walter lewin may 16, 2011 duration. Most electroabsorption modulators are made in the form of a waveguide with electrodes for applying an electric field in a direction perpendicular to the modulated light beam. The required stability of the modulator bias point can be achieved by tracking the photocurrent from the modulator 10. We investigate the feasibility of an electroabsorption modulator integrated laser as a digital coherent transmitter. Waveguidebased electroabsorption modulator performance. Wiedenhaus et al simulation of saturation effects in electroabsorption modulators fig. Such an architecture is amenable to scalability to two dimensions, allowing the possibility of creating a multichannel wavelengthconverting crossbar switch. Electroabsorption modulators based on bulk gan films and. Fm modulators and transmitters sonoma state university. Miller1 1department of electrical engineering, stanford university, stanford, ca. The ea modulator is driven with a voltage source device which is called vpulse and is located in the electrical library. Introduction external optical modulators are very important for optical fiber communication with highspeed modulation in digital and analog systems. N2 we present a complete largesignal dynamic model of electroabsorption modulator integrated eami distributed feedback dfb lasers using the timedependent transfer matrix method.
First, a fundamental study was performed on the applicability of the ingaasingaasp mqw structure to an electroabsorptiontype modulator. Electro optic modulators are key components for fiber optic transmission at data rates exceeding 10gbits. Simultaneous suppression of imd2 and imd3 in analog electroabsorption modulation article in microwave and optical technology letters 296. A terminating impedance circuit, which is thermally decoupled from a substrate, for an electroabsorption modulator, having a modulator capacitance includes a series resistanceemphasized rf delay line exhibiting an impedance distributed over its length, wherein the spatially distributed impedance has at least a predominant resistance per unit length, an inductance per unit length tuned to the. The device is designed for generation of high spectral efficiency optical modulation formats. An electroabsorption modulator eam is a semiconductor device which can be used for modulating the intensity of a laser beam via an electric voltage. We have previously reported on the high modulation bandwidth of 25 ghz mea. An equivalent rf circuit model for electroabsorption modulators eams is proposed and verified. In both types of devices, the absorption edge at room temperature is dominated by excitonic effects and can be strongly modi. Simulation of saturation effects in electroabsorption modulators. High speed electroabsorption modulator in the generic photonic integration platform m. Chung2 1photonicwireless convergence components research department, electronics and telecommunications research.
Publishers pdf, also known as version of record includes final page, issue. An electroabsorption modulator based on indium tin oxide is proposed by constructing a waveguide consisting of metaldielectricitodielectricsi stack. Nov 28, 2015 an electroabsorption modulator based on indium tin oxide is proposed by constructing a waveguide consisting of metaldielectricitodielectricsi stack. The external modulator exmod is modeled in terms of a small signal equivalent circuit model, as shown in figure 7. New experimental data for both the laser and modulator sections are shown. Electroabsorption modulator ii device configuration youtube. Electroabsorption modulator with dual carrier accumulation. Simultaneous suppression of imd2 and imd3 in analog. Figure 4 shows s11 of the modulator at different optical power, taken at maximum slope efficiency. Vertical integration of an electroabsorption modulator onto a. Electronic and computer engineering, university of limerick, limerick, ireland. In the externally modulated links, the optical transmitter is based on a laser power source, typically a solidstate laser, such as ndyag followed by a machzehnder modulator or an electroabsorption modulator. Electroabsorptionmodulated dfb laser ready to attack. Ultraviolet electroabsorption modulators based on bulk gan.
Optically controlled electroabsorption modulators for. Pdf electroabsorption modulator with an asymmetric coupled. An electroabsorption modulator or electroabsorption modulator is a semiconductor device which can be used for controlling modulating the intensity of a laser beam via an electric voltage intensity modulators. The monolithic integration of an electroabsorption ea modulator applying the quantum confined stark effect with a distributed feedback dfb laser diode was demonstrated using a novel approach based on a doublestack multiple quantum well mqw.
Osa high speed gesi electroabsorption modulator at 1550. Concise rf equivalent circuit model for electroabsorption. Simulation of saturation effects in electroabsorption. Highspeed travelingwave electroabsorption modulators. Alloptical wavelength conversion and signal regeneration using an electroabsorption modulator sune hojfeldt, svend bischoff, and jesper mork abstract alloptical wavelength conversion and signal regeneration based on crossabsorption modulation in an ingaasp quantum well electroabsorption modulator eam is studied at different bit rates. Simultaneous modulation of several wdm channels using a single electro. We demonstrate a high speed gesi electroabsorption ea modulator monolithically integrated on 3 m silicononinsulator soi waveguide.
Oktyabrsky1 1co lleg eof nanos c asi nand e ngeer,u ny ab yba y tel5184378609, email. Rp photonics encyclopedia electroabsorption modulators. The feed line is 500 m long on each side of the optical waveguide. A 23 ghz gesige multiple quantum well electroabsorption waveguide modulator is demonstrated with 10 db extinction ratio er. Osa a hybrid electroabsorption modulator device for. Applying a negative voltage bias on the ito layer, carrier accumulation occurs at both dielectricito interfaces, which dramatically changes the guided mode properties due to the epsilonnearzero effect. Low chirp electroabsorption modulated dfb laser fabricated by combining selectivearea. Leijtens 1 1 cobra research institute, eindhoven university of technology, p. Electroabsorption modulators eam have proved to be very attractive both as optical sources monolithically integrated nrz transmitters and rz pulse generators as well as for very fast signal processing demultiplexing, regeneration, wavelength conversion. Simulation of traveling wave electroabsorption modulators.
In this paper, we introduce a novel, waveguide, electroabsorption modulator diode that is monolithically integrated with a surfacenormal illuminated photodetector pd requiring only milliwattlevel optical switching powers. Osa high speed gesi electroabsorption modulator at 1550 nm. As the channel bit rate distance product increases, external modulation of the laser light. Gesige asymmetric fabryperot quantum well electroabsorption modulators elizabeth h. The laser and eam sections are used as phase and amplitude modulators respectively.
Gesige asymmetric fabryperot quantum well electroabsorption. A terminating impedance circuit, which is thermally decoupled from a substrate, for an electroabsorption modulator, having a modulator capacitance includes a series resistanceemphasized rf delay line exhibiting an impedance distributed over its length, wherein the spatially distributed impedance has at least a predominant resistance per unit length, an inductance per. High speed electroabsorption modulators in generic integration. Electroabsorption modulators integrated with dfb lasers. We discuss the challenges involved and demonstrate the combined phase and amplitude modulation on a commercial device. Improvement of modulation bandwidth in electroabsorption modulated laser by utilizing the resonance property in bonding wire oh kee kwon,1,2, young tak han,1 yong soon baek,1 and yun c.
Javier romerovivas, aidan meehan and lukasz krzczanowicz optical communications research group, dept. Its principle of operation is based on the franzkeldysh effect, i. Alloptical wavelength conversion and signal regeneration. The maximum slope of the photocurrent corresponds to an equivalent device impedance of 50 the effect of the reduced impedance at higher optical power also affects the behavior of the modulator under modulation. Electroabsorption modulators based on bulk gan films and gan. By applying bias on the material, the bandgap can be manipulated, and thus results in red shift of absorption spectrum.
The trends for lpp are very similar to that of eril seen before. Balanced electroabsorption modulator for highlinearity. Electroabsorption modulator integrated light sources for future. Since joining ntt optoelectronics laboratories now ntt photonics laboratories in 1990, he has been engaged in developmental research on semiconductor. The device provides a twowire serial interface which allows digital control of the modulation and bias currents, eliminating the need for external components. Balanced electroabsorption modulator for highlinearity, lownoise microwave analog optical link f. There is always a tradeoff between obtaining a low insertion loss in the onstate the transmissive state and getting a low modulation amplitude that is, the voltage modulation span. Improvement of modulation bandwidth in electroabsorptionmodulated laser by utilizing the resonance property in bonding wire oh kee kwon,1,2, young tak han,1 yong soon baek,1 and yun c.
Mason et al 40 gbs tandem electroabsorption modulator 29 fig. The amplified spontaneous emission spectra of the laser as well as the longitudinal mode profile are characterized, and the transmission spectra of the. Optical signal processing using electroabsorption modulators. A trombone phase shifter was used to align the pulse carver and data encoder drive signals. Analysis of multiquantum well electroabsorption modulators. Urban westergren master dissertation submitted in order to obtain the academic degree of erasmus mundus master of science in photonics royal institute of technology kth, stockholm. Finally one can combine the thermal broadening 3kt and the broadening. Electroabsorption modulator nmechanisms franzkeldysh effect nobserved in conventional bulk semiconductors quantumconfined stark effect qcse nquantum well structures nboth of these electroabsorption effects are. Introduction electroabsorption modulators eams are attractive for applications requiringhigh speed modulation, low drive voltage, high extinction ratio and integratibility with lasers. With the modulator, your accompanists wont need to carry an extra book of transitions to shuffle around between songs.
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