Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 29 for “"Injection Locking"”.
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Injection locking characteristics of indium arsenide quantum dash lasers
The study of injection locking characteristics was performed on an InAs Quantum Dash (QDash) semiconductor laser for the first time. The linewidth enhancement factor(α-parameter) of a QDash laser was measured using an injection locking technique that takes advantage of the asymmetry of the …
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Cavity filtered injection locking for large angle atomic interferometry
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science; and, (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2000.
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Simulation of strongly injection-locked semiconductor ring lasers
… laser monolithically integrated with strongly injection-locked whistle-geometry semiconductor ring lasers. Improved high-speed performance of the novel scheme is confirmed through numerical modeling, showing greatly enhanced resonance frequency of up to ~160 GHz. Approaches to further improve …
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An injection-locked 674 nm laser for Strontium-88 ion trapping
… the qubit transition of the 88Sr+ ion, using injection-locking to stabilize the frequency of the new laser. Injection-locking is a technique for using an existing, stable laser to control the frequency of a second laser diode. A small amount of input power is enough to produce a much more …
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Frequency Locking Techniques Based on Envelope Detection for Injection-Locked Signal Sources
… phase noise, and power consumption. Recently, injection locking has been a popular technique to solve these design challenges for frequency generation. However, the narrow locking range of the injection locking techniques limits their use. Furthermore, they suffer from significant reference …
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Photonic integrated circuit for the manipulation of coherent optical combs
… of the devices also means that, through carrier injection, the index can be altered resulting in tunability of the filter. Used above threshold, active filters become useful in filtering coherent combs. Through injection locking, the coherence of the filtered wavelengths with the original comb …
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High-Speed Modulation of Semiconductor Lasers and Modulators
… modulation, and electrical modulation of an injection-locked laser. Electrical modulation on a single semiconductor is commonly used in the real system at bit rates below 10 Gbit/s and has drawbacks such as chirping and low bandwidth. To improve the high-speed performance of a single laser, …
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Techniques for high-speed direct modulation of quantum dot lasers
… gain-lever effect in two-section lasers and the injection-locking technique. Firstly, the modulation performances of p-doped InAs/GaAs QD lasers were studied. Contrary to the theoretical predictions, the modulation efficiency and the highest relaxation frequency of 1.2-mm cavity length lasers …
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Stability Analysis of Negative Resistance-Based Source Combining Power Amplifiers
… oscillation is prevented by means of injection locking.</p>
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Modulation of coherently coupled surface-emitting laser arrays: analysis and applications
… In this dissertation, monolithic mutual optical injection locking induced laser dynamics in phased, coherently coupled implant-defined PhC VCSEL arrays are investigated in detail both theoretically and experimentally. A model based on the well-established injection-locking laser rate equations is …
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Photonic generation of microwave signals : a quantum dot mode locked laser as a microwave source
… the generated microwave signal. In addition, the injection locking of the laser to an external source was studied and demonstrated, as a way to increase the stability of the output microwave signal and to amplify its power by combining the output signals of multiple locked sources. Further …
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Ring oscillator based injection locked clock multiplier
This thesis describes a ring-based injection locked clock multiplier (ILCM) designed with the goal of generating a high-frequency and low-jitter clock. Building on prior research done on injection locking, this design uses a reference frequency doubling technique to push the noise bandwidth of the …
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The design of a 94 GHz high resolution coherent radar
… pulse, low duty cycle, high resolution coherent injection locked radar system for sensor applications, with the specific use as an early warning radar ,against high voltage transmission lines. The recent development of solid-state components for frequencies around 94 GHz has made it possible to …
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Circuit Techniques for Multiple and Wideband Beamforming
… spectral and spatial filtering by sub-harmonic injection oscillators is presented. The design avoids using expensive delay elements by many conventional wideband phased array. Different from prior art of channelization which cannot solve beam-squinting issue among the sub-channels, we use …
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External control of semiconductor nanostructure lasers
… of external control techniques through optical injection-locking, optical feedback and asymmetric current bias control on the overall performance of the nanostructure lasers were conducted in order to understand the associated intrinsic device limitations and to develop strategies for …
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Design of Low Power Integrated Radios
… to generate π/4 DQPSK signals at 2.4GHz using injection locking. Modulation at 1/3rd the RF frequency reduces the transmitter power consumption and enables channel selection using an integer N PLL running at 800MHz. The modulation technique does not require phase calibration and resolves the …
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Frequency and phase locking of a CW magnetron : with a digital phase locked loop using pushing characteristics
… locked to the reference. We next investigate the injection locking of the frequency locked magnetron with small injection levels (-29 dBc to -43 dBc) under differing operating conditions and observe a phase jitter performance of the order of+/-13 o for very small heater power and -29 dBc injection …
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Enhanced Modulation Dynamic Performance of Optically-Injected Widely-Tunable Semiconductor Lasers
… regimes using external light for optical injection-locking (OIL). It is demonstrated that modulation performance of free running (FR) widely tunable lasers strongly depends on the tuned lasing wavelength. The relaxation oscillation frequency (ROF) of FR TLD increases from 2.2 GHz to 5.5 …
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Study of Type-I and Type-Ii Strained Quantum -Well Lasers
… recombination rate. A new technique based on injection locking for measuring the linewidth enhancement factor is developed, and we extract the linewidth enhancement factor for the above three lasers. They are also calculated using the same parameters extracted from the gain spectra and agree …
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High-performance reference frequency generation techniques
… from a 54MHz Pierce XO. A ring oscillator based injection locking clock multiplier driven by the proposed quadrupler is used to demonstrate the efficacy of the quadrupler. Fabricated in a 65nm CMOS process, the proposed clock multiplier occupies an active area of 0.16mm2 and achieves 366fsrms …
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