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Theoretical and Experimental Studies of Semiconductor Based Photonic Devices for All-Optical Signal Processing at 40 Gbit/s and Beyond

Abstract : The optical backbone networks are facing a continuous and tremendous growth of the Internet traffic, requiring to increase the capacity of the transmission systems: WDM systems with a bit rate of 40 Gbit/s do exist and 100 Gbit/s and 160 Gbit/s will be reached soon. At the bit rates of 40 Gbit/s and higher, all-optical signal processing techniques are a very interesting approach in order to reduce the power consumption and the cost of future optical networks. The objective of this work is to develop non-linear optical gates and explore Optical Clock Recovery (OCR) functions based on semiconductor technology for all-optical regeneration at 40 Gbit/s and above. The non-linear dynamic gain of Semiconductor Optical Amplifiers (SOA) was investigated in order to perform simple and compact signal reshaping devices. For retiming function, several OCR configurations based on Self-Pulsating (SP) lasers were investigated during this thesis. The first part of this work is devoted to the SOA-based non-linear optical gates for all-optical 2R regeneration. Gain dynamics assessments using the pump-probe experiment were performed to measure the SOA recovery time. In this work, it is demonstrated that the highly confined bulk based SOA and the long quantum-dot based SOA exhibiting respectively gain recovery times of 20 ps and of 10 ps are suitable for 40 Gbit/s operation. The numerical and experimental studies clarified the important role of intraband effects in SOA dynamics under short pulse (a few of picoseconds) saturations, which makes these SOAs compatible for ultrahigh bit rate operations. The highly confined bulk based SOA was cascaded with a Saturable Absorber (SA) to constitute a complete 2R regeneration function. The reshaping capability of the SOA-SA regenerator has been successfully demonstrated at 40 Gbit/s by experiments and simulations. The second part of this work explores some clock recovery functions based on SP lasers for 3R regeneration at 40 Gbit/s. An original characterisation technique consisting in remodulating the extracted clock was proposed to evaluate the OCR performance. A simple solution using passive pre-filtering was developed to enhance the clock quality extracted by a bulk based SP laser. The polarisation sensitivity of various OCR devices was evaluated. The OCR based on the bulk based SP laser followed by the quantum-dot based SP laser exhibits a total insensitivity to the arriving signal polarisation thanks to Bit-Error-Rate measurements. At last, a preliminary study was devoted to investigate OCR tolerance to Polarisation Mode Dispersion (PMD).
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Submitted on : Monday, January 10, 2011 - 4:04:37 PM
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  • HAL Id : tel-00554333, version 1

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Minh Nguyet Ngo. Theoretical and Experimental Studies of Semiconductor Based Photonic Devices for All-Optical Signal Processing at 40 Gbit/s and Beyond. Engineering Sciences [physics]. Université Rennes 1, 2010. English. ⟨NNT : 2010REN1E004⟩. ⟨tel-00554333⟩

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