Ph.D Thesis

Ph.D StudentLasri Jacob )Kobi(
SubjectMutual Control of Millimeter-Wave Generators and Diode
Lasers via Optoelectronic Mixing in Photo-HBT's
DepartmentDepartment of Electrical and Computer Engineering
Supervisors PROFESSOR EMERITUS Gad Eisenstein
PROF. Dan Ritter


The mutual interaction between millimeter (mm) -wave and optical oscillators enables many attractive possibilities for low phase noise mm-wave sources and low jitter optical pulsers. These have important applications in high-speed digital and analog microwave photonic communication systems, optoelectronic sampling and instrumentation.

In this thesis, optoelectronic mixing and direct optical injection locking in self-oscillating InP/InGaAs heterojunction bipolar phototransistors (photo - HBT’s) are used to investigate and efficiently construct the following: (1) Wavelength locking of two single mode lasers which are detuned by 50 GHz - a standard frequency spacing for dense WDM systems. A locking distribution of only few MHz was demonstrated; (2) Advanced mm-wave sources and modulators. Analog modulation is demonstrated for low phase noise 10 GHz and 30 GHz oscillators. Wide band digital modulation with error free capabilities is also demonstrated; (3) Timing extraction of multi - rate digitally modulated optical signals. Clock recovery at 10 Gb/s and 40 Gb/s is demonstrated with no power penalty. A quantitative model for the phase dynamics of the oscillator was established and systematic locking experiments confirming the model were preformed; (4) A novel self-starting hybrid optoelectronic oscillator generating ultra low jitter optical pulses and low phase noise electrical signals. The hybrid source emits 10 GHz, 15 ps optical pulses which, depending on the measurements frequency range, has an average timing jitter of  40 - 57 fs and an amplitude noise of  0.1 - 0.2 %.