We investigate the selective amplification and filtering of injection locked slotted fabryperot semiconductor lasers. Study on optical injection locked semiconductor lasers. Besides, the sidemode suppression ratio smsr value of each injection locked mode is enhanced, in which. The solid lines correspond to the eigenvalues of the solitary laser. However, in this paper, we show that the slave laser behavior is far more complex and that the stability map is a multivalued function. Wu 1department of electrical engineering and computer sciences, university of california, berkeley, berkeley, california 94720, usa. Moreover, the phase difference between injectionlocked slave diode laser and master laser is analyzed over the. The injection locked laser is injected by 500 mw of the master laser power at 1016 nm 79 figure 4. With and without frequency chirping, where the frequency detuning, carrier injection rate, and cavity length are used as parameters. Nader naderi, mike pochet, fr ed eric grillot, nathan terry, vassilios kovanis, et al modeling the injection locked behavior of a quantum dash. Frequency dynamics of gainswitched injectionlocked. The successful candidate will work on development of advanced semiconductor laser sources based on nanostructures for applications in ultrafast fiberoptic communication systems and in future 5g networks. Conceptual model of an injectionlocked semiconductor laser.
By adjusting the frequency offset between the master laser and the slave laser, improved modulation bandwidth of the. Rosehulman institute of technology, 2007 a dissertation submitted in partial fulfillment of the requirements for the degree of doctor of philosophy. Injection locking of semiconductor lasers with external optical signal has been used in many applications. Injectionlocked optically pumped semiconductor laser yiying. By using strong optical injection locking, we report resonance frequency enhancement in excess of 100 ghz in semiconductor lasers. Mutual injection locking of a fibre laser and a dfb. We show that the hysteresis property of a semiconductor a. Optical bistability in diodelaser amplifiers and injection. Frequency noise performance improvement of mutually injection. Intensitynoise properties of injectionlocked lasers. All optical 2r repeater9 and all optical 3r regeneration10 techniques have been proposed using injection locked dfb laser diode. Injection locking of an actively modelocked semiconductor laser.
Frequency noise performance improvement of mutually. It is shown that the carrier density dependent refractive index affects drastically the behavior of injection locked semiconductor lasers, giving rise to peculiar. We propose a novel approach for highspeed direct modulation of optically injection locked semiconductor lasers by modulating the photon lifetime or the qfactor. Jeanmaxime sarraute, kevin schires, sophie larochelle, senior member, ieee. Highspeed modulation of optical injectionlocked semiconductor lasers by erwin k.
Note that injection locking is more than injection seeding. We first injection lock a directly modulated laser by feeding a component of cw light from a master laser into a currentmodulated slave laser. Photonic microwave generation and transmission using direct. The resulting dynamics has been studied by measuring the output of the slave laser as the frequency detuning between the lasers, the injection strength, and the slave laser current are varied. Modeling the injection locked behavior of a quantum dash semiconductor laser nader naderi, mike pochet, fr ed eric grillot, nathan terry, vassilios kovanis, luke lester to cite this version. Jan 15, 2002 read averaged equations for injection locked semiconductor lasers, physica d. Injection locking of a semiconductor laser can significantly improve its broadband modulation characteristics. Introduction injection locking is a particularly interesting method to reduce laser linewidth,1 enhance the modulation bandwidth,2 synchronize lasers for microwave generation3,4 or measure the linewidth enhancement factor. Strong optical injection locked semiconductor lasers demonstrating 100ghz resonance frequencies and 80ghz intrinsic bandwidths erwin k.
We report what is to our knowledge the first observation of synchronous coherent injection locking of an actively mode locked extended cavity semiconductor laser to an external light pulse train. The laser is rf injection locked via an external source at 18 ghz. Injectionlocked dfb laser diode in main and multiple side. The effect of optical injection locking oil on modulation dynamics of tunable laser diodes tlds is investigated. Highspeed modulation of optical injection locked semiconductor lasers by erwin k. Stability analysis and synchronization of injectionlocked semiconductor lasers with optical feedback yoshiro takiguchi, kohji ohyagi, and junji ohtsubo faculty of engineering, shizuoka university, 351 johoku, hamamatsu, 4328561 japan. In addition, using optical injection means the demultiplexer can track small frequency.
The stable locking boundary map of oil tld which depends on the lasing wavelength was calculated and the tld response in different injection states was investigated. The requirements for low time jitter and reduced fre. Lau 1, xiaoxue zhao, hyukkee sung2, devang parekh, connie chang. The pulsing output is then optically injected into the slave laser to produce desired microwave frequency combs. The performance of the laser can be further improved if a higherq wgm resonator is used for injection locking. Pdf we present the analysis of the selfinjection locking of a singlefrequency laser diode to a highq whispering gallery mode wgm microresonator.
Nonlinear phenomena on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. Osa strong optical injectionlocked semiconductor lasers. Modeshift characteristics and hysteresis property of. Linewidth narrowing of mutually injection locked semiconductor. Yag laser, as well as to the master and slave noise sources. Because an optical isola tor is not used, the two lasers are mutually injection locked when the injected power exceeds a certain value. Strong optical injection locking of edgeemitting lasers.
Spectral characteristics of a regenerative semiconductor optical amplifier mutually injection locked with a fabryperot laser diode. Modeling the injectionlocked behavior of a quantum dash. By varying the delay time, regular pulsing states with different pulsing frequencies are generated in the master laser. Abstractmodifying the rate equations of an injectionlocked semiconductor laser, we have analyzed its optical bistability with the effect of frequency chirping of. Recent citations improved noise characteristics of mutually injection locked semiconductor lasers in a. Injection locking properties of a semiconductor laser ieee xplore. Numerical results are given concerning the feedin rate of different dfb lasers. Pdf selfinjection locking of a laser diode to a highq wgm. Injectionlocked semiconductor lasers for realization of novel rf photonics components by nazanin hoghooghi b. Osa rf injection locked 18 ghz regeneratively modelocked.
Recently, optical injection locking has been proven to enhance the bandwidth and resonance frequency of directlymodulated semiconductor lasers. A layout proposed to study the behavior of an injectionlocked bistable semiconductor laser with one laser source. Jun, 2016 we report on a device to electronically stabilize the optical injection lock of a semiconductor diode laser. Strong optical injection locked semiconductor laser for. A layout proposed to study the behavior of an injection locked bistable semiconductor laser with one laser source. We demonstrate this enhancement in both distributed feedback dfb lasers and verticalcavity surfaceemitting lasers vcsels, showing the broad applicability of the technique and that the coupling q is the figureofmerit for resonance frequency enhancement. Two slave diodes are injection locked to the carrier and sideband frequencies, providing two powerful mw beams offset by 9. The phase noise of the mode locked laser is measured and the integrated timing jitter was found to be 10.
Dfb laser diode can be successfully injection locked not only in the main mode but also in different side modes. Investigation of active filter using injectionlocked. Injection locking properties of a semiconductor laser have been analyzed, taking into account the injected carrier density dependent refractive index in the active region. Locking bandwidth of two laterallycoupled semiconductor. Optical single sideband modulation using strong optical. Two semiconductor laser diodes are required in order to per form an injectionlocking system. We have experimentally demonstrated nearsingle sideband modulation in strong optical injectionlocked semiconductor lasers. On phase noise of selfinjection locked semiconductor lasers. Us5923687a bandwidth enhancement and broadband noise. Semiconductor lasers subjected to external optical injection from a single mode tunable laser have been investigated in a masterslave con.
Cy i njection locking is a promising method to synchro. Locking efficiency is analyzed for semiconductor distributed feedback dfb as well as fabryperot fp lasers operating at 690 nm, 1060 nm, 1550 nm, and 2. Radioonfiber rof technique has been considered as a promising way for the applications to combine optical and wireless communications11, 12. Jun 20, 2000 frequency chirp analysis of injection. Injection locking in distributed feedback semiconductor lasers. Rp photonics encyclopedia injection locking, single. Our basic model is a twoelement laser array which consists of two laterallycoupled semiconductor lasers, i. One laser diode, the master laser, injects its light into the other laser. San miguel abstract the frequency dynamics of gainswitched singlemode semiconductor lasers subject to optical injection is investigated.
Microwave frequency combs are generated by optically injecting a semiconductor laser slave with repetitive pulses from an optoelectronic feedback laser master. Effects of noise on transients of injection locked semiconductor lasers. 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. Simulation of strongly injection locked semiconductor ring lasers feihung chu follow this and additional works at. Injection seeding without frequency locking is often applied to qswitched lasers and to optical parametric oscillators, and sometimes incorrectly called injection locking. Summary of the intensitynoise properties of injection. The noise of injection locked semiconductor lasers is analyzed by rate equations including the spontaneous emission noise. The phase noise of the modelocked laser is measured and the. Novel measurement technique of alpha factor in dfb. This dissertation is brought to you for free and open access by the engineering etds at unm digital repository.
Fast speed semiconductor ring lasers using optical. Injectionlocking mechanisms in semiconductor lasers. An injection locked semiconductor laser process that improves the modulation bandwidth and reduces the broadband noise of an injection locked semiconductor laser. An optical carrier wave generated by a chaotic laser is used to encode a message for optical. Wu department of electrical engineering and computer sciences, university of california, berkeley. Enhancement in the modulation bandwidth of 100 ghz is reported between negative to positive detuning frequency and increasing injection power ratio. Massachusetts institute of technology 2001 a dissertation submitted in partial satisfaction of the requirements for the degree of doctor of philosophy in. Enhancement of the modulation dynamics of an optically injection. Current and temperature tuning are used to selectively filter and amplify subcarriers of coherent optical combs with a selectivity of at least 10 ghz with an optical gain of up to 18 db for filtered lines. Lau, hyukkee sung, xiaoxue zhao, devang parekh, youngkai chen, connie j. It has been found that this dependence significantly affects the injection locking properties, giving rise to a peculiar asymmetric tuning curve and dynamic instability. In this paper, the possibility of improved modulation characteristics of injection locking semiconductor lasers is studied numerically.
The injection locking technique allows the lasers to exceed their fundamental modulation speed limit, allowing for greater communication speeds. Strong optical injection locking of edgeemitting lasers and its applications by hyukkee sung doctor of philosophy in engineering electrical engineering and computer sciences university of california, berkeley professor ming c. Strong optical injectionlocked semiconductor lasers demonstrating 100ghz resonance frequencies and 80ghz intrinsic bandwidths erwin k. Relative intensity noise characteristics of injection. Effects of noise on transients of injection locked semiconductor lasers article pdf available in ieee journal of quantum electronics 294. Scaling of resonance frequency for strong injectionlocked lasers erwin k.
Express 12 052002 view the article online for updates and enhancements. Photonic microwave generation and transmission using direct modulation of stably injectionlocked semiconductor lasers shengkwang hwanga,d. Self injection locked laser can be integrated on a chip, similar to the sbs laser. Optical injection and optoelectronic feedback are efficient techniques to externally control the spectral characteristics of a semiconductor laser. Our analysis has shown that modal instabilities can occur in complexcoupled dfb lasers even though the initial side. Highspeed qmodulation of injectionlocked semiconductor lasers. In section 4, by injecting an optical pulse into the bistable laser, the. In section iv, the properties of an sl subject to external light injection from several lasers are investigated based on numerical analysis and experiments. Theory of modulation of an injectionlocked semiconductor. Modulation properties of an injectionlocked semiconductor laser. If both lasers emit at the same wavelength, they become phase locked, meaning that the slave frequency follows that of the master, even in the presence of modulation of the slave laser current.
Mode suppression in injection locked multimode and single. Osa rf injection locked 18 ghz regeneratively mode. Injection locked semiconductor lasers with delayed optoelectronic feedback abstract. Recent citations improved noise characteristics of mutually injection locked semiconductor lasers in a weak coupling regime xu ke et al. Injectionlocked semiconductor lasers for realization of.
Injection locked semiconductor lasers for realization of novel rf photonics components by nazanin hoghooghi b. Theoretical analysis of optical injection locking in semiconductor. Injectionlocked dfb laser diode in main and multiple side modes. Modulation bandwidth enhancement in optical injection locked semiconductor ring laser. Stability analysis and synchronization of injectionlocked. Simulation of strongly injectionlocked semiconductor ring lasers. Mutual injection locking of a fibre laser and a dfb semiconductor laser l. Osa tunable selfinjection locked green laser diode. A narrowband diode laser is frequency modulated by an electrooptical device. Bandwidth enhancement by optical amplitude and phase. Lau 1, xiaoxue zhao, hyukkee sung2, devang parekh, connie chang hasnain 1, and ming c. Noise analysis of injectionlocked semiconductor injection. Lau, xiaoxue zhao department of electrical engineering and computer sciences, university of california, berkeley, california 94720, usa.
Pdf effects of noise on transients of injection locked. Our technique uses as discriminator the peak height of the lasers transmission signal on a scanning fabryperot cavity and feeds back to the diode current, thereby maintaining maximum optical power in the injected mode. The generalized synchronization of chaos based on phenomenon of injection locking characteristics of semiconductor laser and signal ampli. Qam synthesis by direct modulation of semiconductor lasers. Optical single sideband modulation using strong optical injection locked semiconductor lasers article in ieee photonics technology letters 19. Injection locking of diode lasers to frequency modulated. The laser system can be characterized by the following rate equations of a singlemode semiconductor laser subject to both optical injection and direct modulation 17,32.
Nonlinear dynamics of optically injected semiconductor lasers. Section v is devoted to the proposed scheme based on the experiments and simulations. The optical spectrum of the laser is centered at 1578 nm. Highspeed qmodulation of injectionlocked semiconductor. This paper presents theoretical and experimental results about the effects of a delayed optoelectronic feedback. The currentmodulation properties of an injection locked semiconductor diode laser are investigated, with focus on the two values of detuning at which the intensity or the phasemodulation sensitivity of the slave laser is a minimum. Chang hasnain department of electrical engineering and computer science, university of california at. Injec tion locking of semiconductor lasers can be usefully em ployed in multichannel coherent optical.
Numerous studies on semiconductor lasers with external optical injection have been published so far 18. Up to 12db difference in upper and lower sideband power is observed. Theoretical analysis of optical injection locking in. Optical single sideband modulation using a semiconductor. The output of this sys tem is characterised and shown to exhibit beneficial effects for. The modulation properties of an injection locked semiconductor laser are investigated using the rate equation formalism. Injection locking of diode lasers to frequency modulated source. Highspeed optical injectionlocked lasers lukas chrostowski, wendy zhao, michael moewe, chihhao chang and connie j. Demonstration of self injection locking of a fabryperot semiconductor laser operating at 690 nm. Injection locking properties of a semiconductor laser. Highspeed modulation of optical injectionlocked semiconductor lasers ming c. Dellunde et al frequency dynamics of gainswitched injection locked semiconductor lasers 1539 fig. Averaged equations for injection locked semiconductor lasers. Injection signal wavelength dependence of a subharmonically synchronous mode locked monolithic semiconductor laser.
Hence we show that it is possible to predict the intensitynoise spectrum of an injection locked laser system. Modulation dynamic response of opticalinjectionlocked. Active stabilization of a diode laser injection lock. Chaos synchronization in semiconductor laser systems is a recent hot topic in nonlinear. Frequency dynamics of gainswitched injectionlocked semiconductor lasers j. We discuss our recent progress in iimproving the phase noise of a semiconductor laser using selfinjection locking of to a mode of a highq whispering gallery mode resonator.
We have experimentally demonstrated nearsingle sideband modulation in strong optical injection locked semiconductor lasers. Intensity and phase modulations im and pm are analyzed throughout the locking range where the locked laser is stable. Nearsingle sideband modulation in strong optical injection. The side mode suppression and the relative intensity noise rin of the locked laser slave laser are given for different wavelengths detuning between the master and slave laser and for different linewidth enhancement factors. We report, to the best of our knowledge, the first employment of a selfinjection locking scheme for the demonstration of a tunable ingangan semiconductor laser diode. The amount of asymmetry is controlled by the frequency detuning between the master and the freerunning slave lasers. Strong optical injection locked semiconductor laser for high. The nonlinear laser equations can easily be solved. Scaling of resonance frequency for strong injectionlocked. Injection locking, semiconductor laser, phase noise, dfb laser 1. A simple and effective approach to semiconductor laser linewidth narrowing via mutual injection locking is proposed and demonstrated. Noise analysis of injectionlocked semiconductor injection lasers. Effects of noise on transients of injection locked. Bandwidth enhancement by optical amplitude and phase modulation of injectionlocked semiconductor lasers erwin k.
696 1540 569 859 1268 1385 1365 290 625 817 308 686 304 1144 1299 872 1195 1376 1169 255 1036 988 1120 912 956 1331 1326 314 396 171 1423 622 985 1517 66 952 269 474 999 707 466 562 958 676