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Patterning via Optical Saturable Transitions - Fabrication and Characterization

Patterning via Optical Saturable Transitions - Fabrication and Characterization

Published on: December 11, 2014

Multi-format all-optical processing based on a large-scale, hybridly integrated photonic circuit.

M Bougioukos¹, Ch Kouloumentas, M Spyropoulou

¹National Technical University of Athens, Athens, Greece. mpougiou@mail.ntua.gr

|July 1, 2011

Summary

This study demonstrates a silica-on-silicon photonic integrated circuit for versatile signal regeneration and wavelength conversion. The device effectively processes various optical signal formats, showing promise for advanced optical communication systems.

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Area of Science:

Photonics and Optical Communications
Integrated Optics
Semiconductor Optoelectronics

Background:

Photonic integrated circuits (PICs) are crucial for advancing optical communication systems.
Efficient regeneration and wavelength conversion of multiple optical signal formats are essential for network flexibility.
Silica-on-silicon technology offers a robust platform for complex PICs.

Purpose of the Study:

To investigate the performance of a large-scale silica-on-silicon PIC for multi-format signal regeneration and wavelength conversion.
To evaluate the circuit's capability in processing On-Off Keying (OOK), Differential Phase-Shift Keying (DPSK), and Dual-Polarization Quadrature Phase-Shift Keying (DQPSK) signals.
To assess the regenerative capabilities and wavelength-conversion potential across different modulation formats.

Main Methods:

Numerical simulations and experimental validation were employed.
The circuit integrates four Semiconductor Optical Amplifiers (SOAs) within Mach-Zehnder structures, delay interferometers, and silica waveguides.
Phase-incoherent techniques were utilized for signal processing.

Main Results:

The PIC successfully processed OOK signals at variable bit rates, DPSK at 22/44 Gb/s, and DQPSK at 44 Gbaud.
Simulations indicated wavelength-conversion potential with enhanced regeneration for OOK and DPSK, and acceptable degradation for DQPSK.
Experimental regeneration of 22 Gb/s OOK and DPSK signals, degraded by various noise types, showed up to 1.5 dB power penalty improvement.

Conclusions:

The developed silica-on-silicon PIC demonstrates significant potential for multi-format optical signal regeneration and wavelength conversion.
The circuit exhibits robust performance, particularly for OOK and DPSK formats, with practical implications for optical networks.
Experimental validation confirms the device's effectiveness in mitigating signal degradation, offering improved power penalties.