Examiners
Associate Professor, Henrik Wessing, DTU Fotonik
Consultant, Brian Bach Mortensen
Professor, Rogerio N. Nogueira, Instituto de Telecomunicacoes, Portugal

Supervisors
Professor, Leif Oxenløwe, DTU Fotonik
Associate Professor, Anders Clausen, DTU Fotonik
Assocciate Professor, Michael S. Berger, DTU Fotonik

Presider
Professor, Peter Uhd Jepsen, DTU Fotonik

This Thesis presents 3 years work of an optical circuit that performs both pulse compression and frame synchronization and retiming. Our design aims at directly multiplexing several 10G Ethernet data packets (frames) to a high-speed OTDM link. This scheme is optically transparent and does not require clock recovery, resulting in a potentially very efficient solution.

The scheme uses a time-lens, implemented through a sinusoidally driven optical phase modulation, combined with a linear dispersion element. As time-lenses are also used for pulse compression, we design the circuit also to perform pulse compression, as well. The overall design is: (1) Pulses are converted from NRZ to RZ; (2) pulses are synchronized, retimed and further compressed at the specially designed time-lens; and (3) with adequate optical delays, frames from different input interfaces are added, with a simple optical coupler, completing the OTDM signal generation.

We demonstrate the effectiveness of the design by laboratory experiments and simulations with VPI and MatLab.