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Transceivers cohérents intégrant des lasersIII-V sur silicium pour lestransmissions à 400 Gbit/s

Abstract : Coherent transceivers have become established in long-distance fibre-optic transmission systems over the last ten years or so due to the explosion in data traffic. Fibres are now being introduced in metropolitan networks and data centre connections. Currently, research is very active to develop coherent integrated transmitters and receivers with low cost, low power consumption and small size, with regular announcements of new records in terms of integration density and transmission capacity. This thesis is fully in line with the development of integrated photonic circuits for optical telecommunications applications.The subject of this thesis focuses on polarization diversity coherent transmitters integrating III-V materials and silicon modulators for coherent transmission applications at 400 Gb/s and beyond. The signal emitted by a TE (Transverse Electricity) mode tunable laser is separated into two arms, each one is modulated by a phase modulator based on integrated Mach-Zehnder (MZ) interferometers, generating four 90°-phase-shifted symbols (IQ). The modulated signal is amplified by a Semiconductor Optical Amplifier (SOA). A polarization rotator is integrated at the output of one of the two MZs, in order to convert the TE mode into TM (Transverse Magnetic) mode. A polarization combiner is then used to obtain the polarization multiplexed signal (TE + TM) in the same fiber. This scheme allows the transmission rate to be multiplied by at least 4. The research work of this thesis is articulated along three axes: 1) Realization of widely tunable lasers for the IQ transmitter; 2) Design and realization of innovative phase modulators; 3) Design and realization of coherent transmitters complete with transmitter and receiver integrated on the same chip.
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Submitted on : Thursday, November 19, 2020 - 5:02:08 PM
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Hajar Elfaiki. Transceivers cohérents intégrant des lasersIII-V sur silicium pour lestransmissions à 400 Gbit/s. Optique [physics.optics]. Université Paris-Saclay, 2020. Français. ⟨NNT : 2020UPASO003⟩. ⟨tel-03015051⟩

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