Semiconductor-glass waveguide hybrid lasers with ultra-high spectral purity

Youwen Fan

Research output: ThesisPhD Thesis - Research UT, graduation UT

359 Downloads (Pure)

Abstract

In this thesis we describe investigations of a novel class of semiconductor-glass waveguide hybrid lasers. We show that such lasers provide an unprecedented spectral purity as well as tunability among all chip-based diode lasers. The concept of the investigated hybrid lasers is based on spectral control of light generated with a laser diode using highly frequency selective, tunable optical feedback provided by an integrated photonic circuit. In this work, we have employed InP laser diodes that generate light at around 1.5 μm wavelength, as an important as well as representative example. The integrated waveguide feedback circuits are based on microring resonators (MRRs). The waveguide platform selected for the feedback circuits utilizes Si3N4 as the waveguide core material and SiO2 as cladding material (TriPleXTM), because this provides exceptionally low propagation loss in combination with high index contrast, to enable large optical path lengths (for linewidth narrowing) and sophisticated circuit geometries in a compact, chip-sized format. The thesis is organized as follows: after presenting some theoretical background in Chapter 2, we present a first version of a hybrid laser that possesses reduced roundtrip losses as achieved with an improved optical coupling between the diode and silicon nitride waveguide mode fields. To explore the potential of using narrowband amplification, frequency and phase synchronization, such as for application in the emerging field of microwave photonics. In Chapter 4 we report the first injection locking experiments with such hybrid lasers; in Chapter 5 we report the first integration of a hybrid InP-Si3N4 laser; in Chapter 6 we present a theoretical analysis of such hybrid lasers that for the first time reveals index-induces spatial broadening effects with a spatially resolved modeling of the gain section. Finally, in Chapter 7 we describe how the expertise gained with modeling, laser-design and experimental investigation is used to realize a semiconductor-glass hybrid laser with a record-low Schawlow-Townes linewidth of 290 Hertz. In brief, this thesis describes a most powerful approach towards spectral control of diode lasers for unprecedented high spectral purity, and with large relevance for high-impact applications.
Original languageEnglish
Awarding Institution
  • University of Twente
Supervisors/Advisors
  • Boller, K.-J., Supervisor
Award date30 Mar 2017
Place of PublicationEnschede
Publisher
Print ISBNs978-90-365-4335-4
DOIs
Publication statusPublished - 30 Mar 2017

Fingerprint

purity
waveguides
glass
lasers
theses
semiconductor lasers
feedback circuits
synchronism
frequency synchronization
chips
photonics
injection locking
optical coupling
optical paths
silicon nitrides
format
nitrides
narrowband
emerging
platforms

Keywords

  • IR-104236
  • METIS-321960

Cite this

Fan, Youwen. / Semiconductor-glass waveguide hybrid lasers with ultra-high spectral purity. Enschede : Universiteit Twente, 2017. 136 p.
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title = "Semiconductor-glass waveguide hybrid lasers with ultra-high spectral purity",
abstract = "In this thesis we describe investigations of a novel class of semiconductor-glass waveguide hybrid lasers. We show that such lasers provide an unprecedented spectral purity as well as tunability among all chip-based diode lasers. The concept of the investigated hybrid lasers is based on spectral control of light generated with a laser diode using highly frequency selective, tunable optical feedback provided by an integrated photonic circuit. In this work, we have employed InP laser diodes that generate light at around 1.5 μm wavelength, as an important as well as representative example. The integrated waveguide feedback circuits are based on microring resonators (MRRs). The waveguide platform selected for the feedback circuits utilizes Si3N4 as the waveguide core material and SiO2 as cladding material (TriPleXTM), because this provides exceptionally low propagation loss in combination with high index contrast, to enable large optical path lengths (for linewidth narrowing) and sophisticated circuit geometries in a compact, chip-sized format. The thesis is organized as follows: after presenting some theoretical background in Chapter 2, we present a first version of a hybrid laser that possesses reduced roundtrip losses as achieved with an improved optical coupling between the diode and silicon nitride waveguide mode fields. To explore the potential of using narrowband amplification, frequency and phase synchronization, such as for application in the emerging field of microwave photonics. In Chapter 4 we report the first injection locking experiments with such hybrid lasers; in Chapter 5 we report the first integration of a hybrid InP-Si3N4 laser; in Chapter 6 we present a theoretical analysis of such hybrid lasers that for the first time reveals index-induces spatial broadening effects with a spatially resolved modeling of the gain section. Finally, in Chapter 7 we describe how the expertise gained with modeling, laser-design and experimental investigation is used to realize a semiconductor-glass hybrid laser with a record-low Schawlow-Townes linewidth of 290 Hertz. In brief, this thesis describes a most powerful approach towards spectral control of diode lasers for unprecedented high spectral purity, and with large relevance for high-impact applications.",
keywords = "IR-104236, METIS-321960",
author = "Youwen Fan",
year = "2017",
month = "3",
day = "30",
doi = "10.3990/1.9789036543354",
language = "English",
isbn = "978-90-365-4335-4",
publisher = "Universiteit Twente",
school = "University of Twente",

}

Semiconductor-glass waveguide hybrid lasers with ultra-high spectral purity. / Fan, Youwen.

Enschede : Universiteit Twente, 2017. 136 p.

Research output: ThesisPhD Thesis - Research UT, graduation UT

TY - THES

T1 - Semiconductor-glass waveguide hybrid lasers with ultra-high spectral purity

AU - Fan, Youwen

PY - 2017/3/30

Y1 - 2017/3/30

N2 - In this thesis we describe investigations of a novel class of semiconductor-glass waveguide hybrid lasers. We show that such lasers provide an unprecedented spectral purity as well as tunability among all chip-based diode lasers. The concept of the investigated hybrid lasers is based on spectral control of light generated with a laser diode using highly frequency selective, tunable optical feedback provided by an integrated photonic circuit. In this work, we have employed InP laser diodes that generate light at around 1.5 μm wavelength, as an important as well as representative example. The integrated waveguide feedback circuits are based on microring resonators (MRRs). The waveguide platform selected for the feedback circuits utilizes Si3N4 as the waveguide core material and SiO2 as cladding material (TriPleXTM), because this provides exceptionally low propagation loss in combination with high index contrast, to enable large optical path lengths (for linewidth narrowing) and sophisticated circuit geometries in a compact, chip-sized format. The thesis is organized as follows: after presenting some theoretical background in Chapter 2, we present a first version of a hybrid laser that possesses reduced roundtrip losses as achieved with an improved optical coupling between the diode and silicon nitride waveguide mode fields. To explore the potential of using narrowband amplification, frequency and phase synchronization, such as for application in the emerging field of microwave photonics. In Chapter 4 we report the first injection locking experiments with such hybrid lasers; in Chapter 5 we report the first integration of a hybrid InP-Si3N4 laser; in Chapter 6 we present a theoretical analysis of such hybrid lasers that for the first time reveals index-induces spatial broadening effects with a spatially resolved modeling of the gain section. Finally, in Chapter 7 we describe how the expertise gained with modeling, laser-design and experimental investigation is used to realize a semiconductor-glass hybrid laser with a record-low Schawlow-Townes linewidth of 290 Hertz. In brief, this thesis describes a most powerful approach towards spectral control of diode lasers for unprecedented high spectral purity, and with large relevance for high-impact applications.

AB - In this thesis we describe investigations of a novel class of semiconductor-glass waveguide hybrid lasers. We show that such lasers provide an unprecedented spectral purity as well as tunability among all chip-based diode lasers. The concept of the investigated hybrid lasers is based on spectral control of light generated with a laser diode using highly frequency selective, tunable optical feedback provided by an integrated photonic circuit. In this work, we have employed InP laser diodes that generate light at around 1.5 μm wavelength, as an important as well as representative example. The integrated waveguide feedback circuits are based on microring resonators (MRRs). The waveguide platform selected for the feedback circuits utilizes Si3N4 as the waveguide core material and SiO2 as cladding material (TriPleXTM), because this provides exceptionally low propagation loss in combination with high index contrast, to enable large optical path lengths (for linewidth narrowing) and sophisticated circuit geometries in a compact, chip-sized format. The thesis is organized as follows: after presenting some theoretical background in Chapter 2, we present a first version of a hybrid laser that possesses reduced roundtrip losses as achieved with an improved optical coupling between the diode and silicon nitride waveguide mode fields. To explore the potential of using narrowband amplification, frequency and phase synchronization, such as for application in the emerging field of microwave photonics. In Chapter 4 we report the first injection locking experiments with such hybrid lasers; in Chapter 5 we report the first integration of a hybrid InP-Si3N4 laser; in Chapter 6 we present a theoretical analysis of such hybrid lasers that for the first time reveals index-induces spatial broadening effects with a spatially resolved modeling of the gain section. Finally, in Chapter 7 we describe how the expertise gained with modeling, laser-design and experimental investigation is used to realize a semiconductor-glass hybrid laser with a record-low Schawlow-Townes linewidth of 290 Hertz. In brief, this thesis describes a most powerful approach towards spectral control of diode lasers for unprecedented high spectral purity, and with large relevance for high-impact applications.

KW - IR-104236

KW - METIS-321960

U2 - 10.3990/1.9789036543354

DO - 10.3990/1.9789036543354

M3 - PhD Thesis - Research UT, graduation UT

SN - 978-90-365-4335-4

PB - Universiteit Twente

CY - Enschede

ER -