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Analysis of antiresonant reflecting optical waveguide gratings by use of the Method of Lines
Department of Electrical Engineering, King Fahd Univ. of Petrol./Minerals, Saudi Arabia.
KTH, Tidigare Institutioner                               , Mikroelektronik och informationsteknik, IMIT.
2003 (Engelska)Ingår i: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 42, nr 18, s. 3488-3494Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The modal spectral response of an antiresonant reflecting optical waveguide (ARROW) with periodic corrugations or grating is calculated for both shallow and deep gratings with the Method of Lines. The effect of the ARROW layer thickness and the grating depth on the spectral response is studied. It is found that when the ARROW-layer thickness is close to resonance, the ripples in the reflection spectra become smooth and the peak reflectivity drops. This is attributed to the large increase in the leakage loss of the ARROW waveguide near resonance. The ARROW grating is characterized by modal reflectivity spectra, which exhibit a strong polarization discrimination property, in favor of the TE polarization.

Ort, förlag, år, upplaga, sidor
2003. Vol. 42, nr 18, s. 3488-3494
Nyckelord [en]
Spectral response; Diffraction gratings; Light polarization; Optical fibers; Optical waveguides
Nationell ämneskategori
Telekommunikation
Identifikatorer
URN: urn:nbn:se:kth:diva-24233DOI: 10.1364/AO.42.003488ISI: 000183661700005OAI: oai:DiVA.org:kth-24233DiVA, id: diva2:345776
Anmärkning
QC 20100827Tillgänglig från: 2010-08-27 Skapad: 2010-08-27 Senast uppdaterad: 2017-12-12Bibliografiskt granskad
Ingår i avhandling
1. Photonic devices with MQW active material and waveguide gratings: modelling and characterisation
Öppna denna publikation i ny flik eller fönster >>Photonic devices with MQW active material and waveguide gratings: modelling and characterisation
2005 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

The research work presented in this thesis deals with modelling, design and characterisation of passive and active optical waveguide devices. The rst part of the thesis is related to algorithm development and numerical modelling of planar optical waveguides and gratings using the Method of Lines (MoL). The basic three-point central-di erence approximation of the δ2=δx2 operator used in the Helmholtz equation is extended to a new ve-point and seven-point approximation with appropriate interface conditions for the TE and TM elds. Di erent structures such as a high-contrast waveguide and a TM surface plasmon mode waveguide are simulated, and improved numerical accuracy for calculating the optical mode and propagation constant is demonstrated. A new fast and stable non-paraxial bi-directional beam propagation method, called Cascading and Doubling algorithm, is derived to model deep gratings with many periods. This algorithm is applied to model a quasi-guided multi-layer anti-resonant reecting optical waveguide (ARROW) grating polarizing structure.

In the second part of the thesis, our focus is on active optical devices such as vertical-cavity and edge-emitting lasers. With a view to improve the bandwidth of directly modulated laser, an InGaAsP quantum well with InGaAlAs barrier is studied due to its favorable band o set for hole injection as well as for electron con nement. Quantum wells with di erent barrier bandgap are grown and direct carrier transport measurements are done using time and wavelength resolved photoluminescence upconversion. Semi-insulating regrown Fabry-Perot lasers are manufactured and experimentally evaluated for light-current, optical gain, chirp and small-signal performance. It is shown that the lasers having MQW with shallow bandgap InGaAlAs barrier have improved carrier transport properties, better T0, higher di erential gain and lower chirp. For lateral current injection laser scheme, it is shown that a narrow mesa is important for gain uniformity across the active region. High speed directly modulated DBR lasers are evaluated for analog performance and a record high spurious free dynamic range of 103 dB Hz2=3 for frequencies in the range of 1-19 GHz is demonstrated. Large signal transmission experiment is performed at 40 Gb/s and error free transmission for back-to-back and through 1 km standard single mode ber is achieved.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH, 2005. s. xvi, 82
Serie
Trita-MVT, ISSN 0348-4467 ; 2005:3
Nyckelord
Method of Lines, Grating, ARROW Waveguide, Semiconductor laser, quantum well
Nationell ämneskategori
Telekommunikation
Identifikatorer
urn:nbn:se:kth:diva-433 (URN)91-7178-132-3 (ISBN)
Disputation
2005-10-07, Sal C1, KTH-Electrum, 10:00
Opponent
Handledare
Anmärkning
QC 20100827Tillgänglig från: 2005-09-27 Skapad: 2005-09-27 Senast uppdaterad: 2010-08-27Bibliografiskt granskad

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