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 54 for “"timing jitter"”.
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Timing jitter studies in modelocked fiber lasers
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2003.
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Attosecond timing jitter modelocked lasers and ultralow phase noise photonic microwave oscillators
… of applications in which frequency stability and timing accuracy are essential to performance. Wide use of this technology, however, requires compact system architecture, low-term stability and low energy consumption, which drive the needs to develop high repetition-rate femtosecond lasers …
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Femtosecond fiber lasers at 1550 nm for high repetition rates and low timing jitter
… many areas including: frequency combs, precise timing distribution, optical arbitrary waveform generation, and high bit rate sampling for analog to digital conversion. Experiments and applications like these put demanding requirements on the source laser oscillator; such as operating near 1550 …
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Noise and stability of actively modelocked fiber lasers
The timing jitter of a modelocked laser is fundamentally limited by the amplified spontaneous emission in the laser cavity. While one cannot, even in principle, remove this source of noise, one does have control over the pulse timing by using filtering and modulation. In this thesis, we report on …
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Ultralow-noise modelocked lasers
… modelocked semiconductor laser with an rms timing jitter of only 47 fs (10 Hz to 10 MHz) and 86 fs (10 Hz to 4.5 GHz). The daunting task of measuring ultralow-noise levels is solved by a combined use of microwave and optical measurement techniques that yield complete characterization of the …
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Low jitter phase-locked loop clock synthesis with wide locking range
… communications applications. Phase noise and timing jitter are important design considerations for these communications applications. The desire for highly complex levels of integration using low cost CMOS technologies works against the minimization of timing jitter and phase noise for …
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Low Phase Noise Oscillator Design. A Design Methodology for Improving Performance: Theoretical Analysis, CAD Simulations, and Prototype Building
… perturbation-projection vector, and phase noise/timing jitter for oscillators are presented. These techniques enable a quantitative estimate of the oscillator phase noise/timing jitter performance from its constituent circuit characteristics with high accuracy. Further, the engineering techniques …
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Integrated waveguide devices for mode-locked lasers
… source of optical pulses with intrinsically low timing jitter, and as such have a broad range of important applications, both as sources of low-noise microwave signals and as the key enabling technology for optical frequency combs. Integrating such laser systems onto a chip using silicon …
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Bit error rate simulation enhancement and outage prediction in mobile communication systems
… in simulations. Implementation of receiver timing jitter and timing recovery models, as well as modifications of the channel generation (two-ray model) and conversion (imported channel), are among the enhancements that have been added. The bit error rate and outage performance of the …
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All-optical processing using cross-phase modulation
… along an optical transmission line some timing irregularities can occur such as timing jitter and phase wander. Traditionally these timing problems would have been corrected by converting the optical signal into the electrical domain and then compensating for the timing irregularity …
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Monolithic low phase noise oscillators for moderate frequency applications
… of noise in an oscillator and the resulting timing jitter reveals how the noise at the oscillator nodes changes during each portion of the cycle. The model can then be used to examine the effects of changing various process and design parameters such as threshold voltages and the effective …
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Nano-optical studies of superconducting nanowire single-photon detectors
… include low dark count rates (Hz) and low timing jitter (sub 100 ps). SNSPDs have been employed in practical photon-counting applications such as quantum key distribution (QKD), operation of quantum waveguide circuits and quantum emitter characterisation. Major challenges in the development …
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Sub-femtosecond precision timing distribution, synchronization and coherent synthesis of ultrafast lasers
… optical pulse trains, with respect to pulse timing and phase. First, analytical analysis of the balanced optical cross-correlator (BOC) for attosecond precision pulse timing measurement is presented for both short and long crystal devices. It is found that the sensitivity of the long crystal …
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Microwave techniques and applications for semiconductor quantum dot mode-locked lasers
… external stabilization methods to improve the timing stability in passive MLLs have been studied and an all-microwave measurement technique has also been developed to determine the pulse-to-pulse rms timing jitter. Compared to the conventional optical cross-correlation technique, the new method …
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Nonlinearly regenerated long haul data transmission
… with a generic system without NOLMs. Thirdly, timing jitter in concatenated NOLM system is examined and compared to the generic system and lastly issues of OTDM amplitude non-uniformity from channel to channel in a saturable absorber, specifically a NOLM, are raised. Transmission at a rate of …
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System demonstration of an optically-sampled, wavelength-demultiplexed photonic analog-to-digital converter
… sampling rates is fundamentally limited by the timing jitter of electronic clocks. To circumvent this limitation, one method is to exploit the orders-of-magnitude lower timing jitter of mode-locked lasers and implement optical sampling as a front-end for electronic ADCs. The optical-sampling, …
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Toward single-cycle optical pulses
… spectra are necessary. Secondly, a tight timing synchronization with timing jitter under one-tenth of the synthesized pulsewidth has to be implemented. Finally, the carrier-envelope offset frequency lock between two lasers completes the coherent pulse synthesis process. In this thesis, the …
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The impact of WH/TS codes in implementing incoherent OCDMA system
… including the influence of chromatic dispersion, timing jitter and the effect of ambient temperature fluctuations on data transmission over a 17-km bidirectional fibre link (a testbed) I designed between Strathclyde and Glasgow University. The OCDMA system is based on two-dimensional …
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Ultrashort, High Power, And Ultralow Noise Mode-locked Optical Pulse Generation Using Quantum-dot Semiconductor Lasers
… was investigated. Significant reduction of the timing jitter under hybrid mode-locked operation was achieved owing to more than one order of magnitude reduction of the linewidth in QD gain media. Ultralow phase noise performance (integrated timing jitter of a few fs at a 10 GHz repetition rate) …
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Long distance dispersion managed soliton transmission experiments
… distance propagation scheme which achieved low timing jitter by suppression of the amplifier noise and by working close to the zero dispersion wavelength has been discovered. The use of fibre Bragg gratings as wavelength filters to suppress noise and reduce timing jitter has been investigated. …
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