Comparison between Integral Method and Harmonic Analysis on the Timing Jitter Characteristics of Gain-Switched Semiconductor Laser Diodes
Date Issued
2012
Date
2012
Author(s)
SU, CHIEN-RU
Abstract
A theoretical and experimental comparison between two methods of timing jitter calculation in the gain-switched laser diode is made. The integral method utilizes spectral area of the single side-band (SSB) phase noise spectrum to calculate root mean square (rms) timing jitter. Another approach, harmonic analysis, exploits the uppermost noise power in high harmonics to retrieve timing fluctuation instead. Even though both methods have been verified to be accurate, a full comparison has yet to be performed. This thesis will first demonstrate that both amplitude noise and timing jitter fluctuation can be characterized efficiently by implementing two methods with Labview programs. Results show that a consistent timing jitter is found by the integral method (1.1ps) and harmonic analysis (1.25ps) in gain-switched laser diodes with an external cavity scheme. A comparison of the two approaches in noise measurement of diode-pumped Yb:KY(WO4)2 (Yb:KYW) passive mode-locked laser is also discussed, which both give an outcome of 2ps rms timing jitter. The results indicate that either harmonic analysis or integral method can be successfully utilized to calculate timing jitter.
Subjects
Laser diodes
Single side-band phase noise spectrum
Timing jitter
Integral method
Harmonic analysis
Type
thesis
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