Title: “Optical Signal Processing using Time Lenses”
Supervisors:
Principal supervisor: Professor Toshio Morioka, DTU Fotonik, Denmark
Co-supervisor: Associate Professor Michael Galili, DTU Fotonik, Denmark
Co-Supervisor: Professor, Leif katsuo Oxenløwe, DTU Fotonik, Denmark
Evaluation Board:
Assoc. Prof. Morten Bache, DTU Fotonik (Chairman)
Prof. Periklis Petropoulos, University of Southampton, UK
Dr. Jochen Schröder, Chalmers University of Technology, Sweden
Master of the Ceremony:
Professor Hao Hu, DTU Fotonik
Abstract:
“This thesis concerns the use of time lenses for all-optical signal processing. By relation of a space-time duality, time lenses can be used to form optical Fourier systems for pulses in fiber similar to free-space Fourier systems. Some functionalities achieved here with time lenses include: signal format conversion, optical correlation and spectral compression. The latter was demonstrated in a spectral telescope simultaneously compressing a wavelength-division multiplexing (WDM) signal and re-allocating the wavelength. The concept of partial and complete optical Fourier transformation (OFT) using time lenses are introduced and it is shown how a complete OFT can be used to operate on signals with high spectral efficiency. Several demonstrations for format conversion have been accomplished, perhaps most fully for the demonstration of a novel multi-channel phase regenerator. This regenerator scheme combines the usage of OFT for conversions between parallel and serial signals with an optical time-division multiplexing (OTDM) viable phase regenerator, making it possible to regenerate WDM signals.”