A careful selection and accurate experimental characterization of the enabling building blocks for tuneable and hitless integrated-optic filters in silicon photonics technology is presented. Band-pass filter specifications are evaluated and the requirements on the filter architecture and its elements are defined with particular attention to the hitless operation and the large operation bandwidth. The relative disconnection mechanism is performed by forward-biased silicon p-i-n junction integrated in a rib waveguide, called Variable Optical Attenuator (VOA). The mechanism exploits the plasma dispersion effect to increase the optical loss and disconnect the input from the output. This concept is extended integrating the VOA in the micro-ring resonator filter and in a fourth order MRR filter exploiting the Vernier effect to obtain ultra-wide Free Spectral Range (FSR) suitable for WDM applications. Tuning of the high order filter along the extended C-band (1529.16-1567.13nm) is provided acting thermally on integrated micro-heaters and disconnection mechanism performed for three different channels, thus proving the efficiency of the technique at each wavelength. The effectiveness of the system is investigated providing numerical results for each single device composing the whole structure. Fast disconnection operation is also required and a valid technique for compensation of unwanted thermal induced delays is proposed and demonstrated.
La tesi presenta un'attenta selezione e accurata caratterizzazione sperimentale dei building block che permettono il funzionamento di filtri ottici tunabili e hitless, integrati in tecnologia silicon photonics. Sono valutate le specifiche di un filtro passa banda e definiti i requisiti dell'architettura del filtro e dei suoi elementi, con particolare attenzione al meccanismo hitless e il funzionamento a larga banda. La relativa operazione di disconnessione viene effettuata da una giunzione p-i-n in silicio polarizzata in diretta e integrata in una guida d'onda rib, chiamata Attenuatore Ottico Variabile (VOA). Il meccanismo sfrutta il plasma dispersion effect per incrementare le perdite ottiche e disconnettere l'ingresso dall'uscita. Questo concetto viene esteso integrando il VOA in un filtro ad anello risonante (MRR) e in un filtro ad anello risonante del quarto ordine che sfrutta il principio di Vernier per ottenere un Free Spectral Range (FSR) ultra esteso, adeguato per applicazioni WDM. Viene mostrato il tuning del filtro di ordine maggiore lungo la C-band estesa (1529.16-1567.13nm) agendo termicamente su micro-heater integrati e verificato il meccanismo di disconnessione per tre canali differenti, dimostrando di fatto l'efficienza di questa tecnica ad ogni lunghezza d'onda. L'efficacia del sistema viene investigata fornendo risultati numerici per ogni singolo dispositivo che compone l'intera struttura. Una veloce operazione di disconnessione è inoltre richiesta e viene perciò proposta e dimostrata una valida tecnica di compensazione dei ritardi indotti termicamente dalla struttura.
Enabling building blocks for silicon photonics tunable filters
BRUGNONI, ALESSANDRO
2019/2020
Abstract
A careful selection and accurate experimental characterization of the enabling building blocks for tuneable and hitless integrated-optic filters in silicon photonics technology is presented. Band-pass filter specifications are evaluated and the requirements on the filter architecture and its elements are defined with particular attention to the hitless operation and the large operation bandwidth. The relative disconnection mechanism is performed by forward-biased silicon p-i-n junction integrated in a rib waveguide, called Variable Optical Attenuator (VOA). The mechanism exploits the plasma dispersion effect to increase the optical loss and disconnect the input from the output. This concept is extended integrating the VOA in the micro-ring resonator filter and in a fourth order MRR filter exploiting the Vernier effect to obtain ultra-wide Free Spectral Range (FSR) suitable for WDM applications. Tuning of the high order filter along the extended C-band (1529.16-1567.13nm) is provided acting thermally on integrated micro-heaters and disconnection mechanism performed for three different channels, thus proving the efficiency of the technique at each wavelength. The effectiveness of the system is investigated providing numerical results for each single device composing the whole structure. Fast disconnection operation is also required and a valid technique for compensation of unwanted thermal induced delays is proposed and demonstrated.| File | Dimensione | Formato | |
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Alessandro_Brugnoni_thesis_def.pdf
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Descrizione: Testo della tesi definitivo
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https://hdl.handle.net/10589/164326