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PhD: Design, fabrication and characterization of high speed detector for future 100 Gbit/s access network» posté par Nokia

Full-Time
Nozay

Description de l'offre

About Nokia Bell Labs
Over its nearly 100-year history, Nokia Bell Labs has invented many of the foundational technologies that underpin information and communication networks and all digital devices and systems. This research has resulted in nine Nobel Prizes, four Turing Awards, three Japan Prizes and a plethora of National Medals of Science and Engineering, as well three Emmys, two Grammys and an Oscar for technical innovations. Nokia Bell Labs continues to conduct disruptive research focused on solving the challenges of the new digital era and innovating the technology that will define the next industrial revolution.


Industrial PhD thesis


« Design, fabrication and characterization of high speed detector for future 100 Gbit/s access network »


Context:
The increasing demand of bandwidth due to video on demand, cloud (gaming, storage, social network, professional software,…) and the convergence of mobile and fixed access network will require in the short term a new generation of high speed access network at 50 to 100 Gbit/s.
Access networks requires low cost and power consumption components and can’t therefore use long haul 100G components which use complex coherent technology. On the contrary, the need for very high optical budget doesn’t allow to use without modification data center components.
One of the main challenge is to realize high-speed access receiver with a high sensitivity to cope with optical budget above 29 dB. Avalanche photodiodes are the key component for current access network up to 25 Gbit/s but there is a doubt on their capability to be performant above 50 GHz due to intrinsic physical limitations. On the contrary we have demonstrated over the last years very good performances using monolithical integration of a high speed photodiode with a semiconductor optical amplifier (SOA). However, these components cannot cope actually with cost and power consumption of APDs.

Several possibility of improvement exist and should be studied to find the best solution for future access network.


•    For APD
o    Using waveguide topology to reduce the absorption thickness
o    Using new avalanche material
•    For SOA-UTC
o    Optimization of the active area (to reduce PDL and noise figure
o    Design and process simplification (cost reduction, better reproducibility, performance optimization)
o    Implémentation of new functions like optical filter


Objectives and organization of the PhD:
The purpose is to realize a high speed/high sensitivity receiver for access networks in O-band. In a first time, the student will make a comparison of APD photodiodes and pre-amplified detector, based on analysis os existing component in III-V lab and bibliographical studies to select the most promising candidate. In a second step, the student will design the component using optical and HF simulations, with a care attention on the fabrication constraints. 


The focus points will be the following:
•    Choice of SOA-UTC
o    Development of process building blocks which simplify design and process.
o    Optimization of the active structure of the SOA, mainly to have a polarization independent component, to reduce noise figure and energy consumption.
o    UTC photodiode optimization (semiconductor layer structure and HF design) to boost bandwidth
•    Choice of APD
o    Analysis of the vertical structure and avalanche materials
o    Analysis of junction passivation to allow realization of waveguide structure with low dark current which is the usual drawback of waveguide APD

These researches will be supported by fast process test, which will allow validating the choice for the complete receiver. The student will then be involved in the fabrication of the component and in will be in charge of its characterization (optical and electrical) and the subsequent analysis. 


This will include the following characterization:
•    Optical performance of the component, including responsivity and noise figure measurement.
•    S parameter measurement and equivalent circuit extraction to validate its design and find perspective for improvement
•    Opto electrical bandwidth of the receiver.


Finally, system test will be done in collaboration with Bell Labs researchers.
 
Imagine creating technology that has the potential to change the world. Working with us, you will have a positive impact on people’s lives and help to overcome some of the world’s most pressing challenges. We act inclusively and respect the uniqueness of people. At Nokia, employment decisions are made regardless of race, color, national or ethnic origin, religion, gender, sexual orientation, gender identity or expression, age, marital status, disability, protected veteran status or other characteristics protected by law. Nokia culture welcomes people as their true selves. Come create the technology to connect the world 


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