טכניון מכון טכנולוגי לישראל
הטכניון מכון טכנולוגי לישראל - בית הספר ללימודי מוסמכים  
Ph.D Thesis
Ph.D StudentDahan David
SubjectRaman and Parametric Mediated Amplification and all Optical
Processing for High Speed Fiber Optics
Communication Systems
DepartmentDepartment of Electrical Engineering
Supervisor Professor Emeritus Gad Eisenstein


Abstract

This Ph.D. research addresses the theoretical and experimental aspects of Raman and parametric effects as candidates for amplification, all optical processing and optical source devices.
In the first part of this research, the noise properties of saturated fiber Raman amplifiers are investigated in CW regime. It is demonstrated that a saturated fiber Raman amplifier has a unique behaviour under saturation in comparison to the case for an EDFA or a SOA.

The second topic in this thesis describes two techniques to generate high speed optical pulses sources based on Optical Parametric Amplifiers (OPA). A special focus is put on the timing stability of these sources. Firstly, self starting ultra low jitter optical pulses based on mutually coupled optoelectronic oscillators with an intra cavity fiber parametric amplifier is proposed: The second technique proposes a 10 GHz multi wavelength pulse source based on high order four wave mixing products generated by a saturated optical fiber parametric amplifier.


The third part of the research deals with two novel all optical processing devices. The first is a wavelength converter based on Raman mediated crosstalk. Conversion and regeneration over 1 THz are demonstrated with excellent noise reduction and low errors at 10 Gbit/s. The second device is a tunable all optical delay line based on slow and fast light propagation in a narrow band Raman assisted OPA. The proposed scheme offers tunable delay in the presence of gain and with a bandwidth which is sufficiently wide to process digital data streams at tens of Gbit/s rates as well as picoseconds pulses.