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1.
Opt Lett ; 40(12): 2755-7, 2015 Jun 15.
Artículo en Inglés | MEDLINE | ID: mdl-26076254

RESUMEN

Grating couplers are widely used to couple light between photonic integrated circuits and optical fibers. Here, we fabricate and characterize a device based on a buried metal grating. In contrast to dielectric gratings, simulations predict strongly reduced parasitic leakage of light to the substrate and are performance independent of the optical buffer thickness, while using standard fabrication processes with high yield. The gratings show a 3 dB bandwidth of 61 nm and chip-to-fiber coupling efficiency of 54%, which makes them attractive building blocks for on-wafer testing and dense optical interconnects.

2.
Opt Lett ; 38(18): 3482-4, 2013 Sep 15.
Artículo en Inglés | MEDLINE | ID: mdl-24104793

RESUMEN

We report the fabrication and characterization of a new polarization converter for InGaAsP-InP photonic integrated circuits. The converter consists of two right trapezoidal sections with the angled sidewalls etched wetly. The converters show a greatly improved tolerance to variations of the fabrication, an averaged efficiency of polarization conversion of 99.8% and a loss of about 0.7 dB at a wavelength of 1.535 µm.

3.
Opt Lett ; 38(7): 1061-3, 2013 Apr 01.
Artículo en Inglés | MEDLINE | ID: mdl-23546243

RESUMEN

We show an improved fabrication process of trapezoidal polarization converters for InP-based photonic integrated circuits. The new process has reduced complexity, and the fabricated converters have loss two times lower than reported previously. The measurements of the converters show an efficiency of polarization conversion of 97.9% at a wavelength of 1.535 µm and loss below 0.5 dB.

4.
Opt Express ; 20(26): B270-8, 2012 Dec 10.
Artículo en Inglés | MEDLINE | ID: mdl-23262862

RESUMEN

We experimentally and theoretically investigate the stability of a single-mode integrated filtered-feedback laser as a function of the electrically controlled feedback phase. We interpret the measurements in terms of feedback-induced dynamics, compare them with the results from a stability analysis model for conventional feedback, and find good qualitative agreement.

5.
Opt Express ; 20(20): 22660-8, 2012 Sep 24.
Artículo en Inglés | MEDLINE | ID: mdl-23037415

RESUMEN

Earlier it was observed that polarization rotation in an AWG built from birefringent waveguides can result in sidelobes in its response. This effect was measured in a polarization sensitive AWG with an orthogonal layout. Now we investigate through detailed simulation whether this effect also exists in polarization desensitised AWGs. It is shown that a dispersion compensated AWG does not suffer from a polarization sidelobe. Alternatively, the AWG can be designed to minimize polarization rotation to suppress the sidelobe.


Asunto(s)
Modelos Teóricos , Refractometría/instrumentación , Dispersión de Radiación , Simulación por Computador , Diseño Asistido por Computadora , Diseño de Equipo , Análisis de Falla de Equipo , Luz
6.
Opt Express ; 20(4): 3675-92, 2012 Feb 13.
Artículo en Inglés | MEDLINE | ID: mdl-22418126

RESUMEN

In this paper a study of waveguide photodetectors based on InAs/InP(100) quantum dot (QD) active material are presented for the first time. These detectors are fabricated using the layer stack of semiconductor optical amplifiers (SOAs) and are compatible with the active-passive integration technology. We investigated dark current, responsivity as well as spectral response and bandwidth of the detectors. It is demonstrated that the devices meet the requirements for swept-source optical coherent tomography (SS-OCT) around 1.7 µm. A rate equation model for QD-SOAs was modified and applied to the results to understand the dynamics of the devices. The model showed a good match to the measurements in the 1.6 to 1.8 µm wavelength range by fitting only one of the carrier escape rates. An equivalent circuit model was used to determine the capacitances which dominated the electrical bandwidth.

7.
Opt Express ; 19(16): 15109-18, 2011 Aug 01.
Artículo en Inglés | MEDLINE | ID: mdl-21934872

RESUMEN

We investigate electrically pumped, distributed feedback (DFB) lasers, based on gap-plasmon mode metallic waveguides. The waveguides have nano-scale widths below the diffraction limit and incorporate vertical groove Bragg gratings. These metallic Bragg gratings provide a broad bandwidth stop band (~500 nm) with grating coupling coefficients of over 5000/cm. A strong suppression of spontaneous emission occurs in these Bragg grating cavities, over the stop band frequencies. This strong suppression manifests itself in our experimental results as a near absence of spontaneous emission and significantly reduced lasing thresholds when compared to similar length Fabry-Pérot waveguide cavities. Furthermore, the reduced threshold pumping requirements permits us to show strong line narrowing and super linear light current curves for these plasmon mode devices even at room temperature.

8.
Opt Express ; 17(20): 18063-75, 2009 Sep 28.
Artículo en Inglés | MEDLINE | ID: mdl-19907596

RESUMEN

For the first time a detailed study of hybrid mode-locking in two-section InAs/InP quantum dot Fabry-Pérot-type lasers is presented. The output pulses have a typical upchirp of approximately 8 ps/nm, leading to very elongated pulses. The mechanism leading to this typical pulse shape and the phase noise is investigated by detailed radio-frequency and optical spectral studies as well as time-domain studies. The pulse shaping mechanism in these lasers is found to be fundamentally different than the mechanism observed in conventional mode-locked laser diodes, based on quantum well gain or bulk material.


Asunto(s)
Interferometría/instrumentación , Rayos Láser , Modelos Teóricos , Puntos Cuánticos , Simulación por Computador , Diseño Asistido por Computadora , Diseño de Equipo , Análisis de Falla de Equipo , Luz , Reproducibilidad de los Resultados , Dispersión de Radiación , Sensibilidad y Especificidad
9.
Opt Express ; 17(13): 11107-12, 2009 Jun 22.
Artículo en Inglés | MEDLINE | ID: mdl-19550510

RESUMEN

We demonstrate lasing in Metal-Insulator-Metal (MIM) waveguides filled with electrically pumped semiconductor cores, with core width dimensions below the diffraction limit. Furthermore these waveguides propagate a transverse magnetic (TM0) or so called gap plasmon mode [1-4]. Hence we show that losses in sub-wavelength MIM waveguides can be overcome to create small plasmon mode lasers at wavelengths near 1500 nm. We also give results showing room temperature lasing in MIM waveguides, with approximately 310 nm wide semiconductor cores which propagate a transverse electric mode.


Asunto(s)
Rayos Láser , Metales/química , Semiconductores , Diseño de Equipo , Luz , Óptica y Fotónica , Refractometría/métodos , Reproducibilidad de los Resultados , Temperatura , Difracción de Rayos X
10.
Opt Express ; 16(15): 10968-74, 2008 Jul 21.
Artículo en Inglés | MEDLINE | ID: mdl-18648411

RESUMEN

We report on directional mode switching in semiconductor ring lasers through optical injection co-propagating with the lasing mode. The understanding of this novel feature in ring lasers is based on the particular structure of a two-dimensional asymptotic phase space. Our theoretical results are verified numerically and experimentally.


Asunto(s)
Diseño Asistido por Computadora , Láseres de Semiconductores , Modelos Teóricos , Óptica y Fotónica/instrumentación , Simulación por Computador , Diseño de Equipo , Análisis de Falla de Equipo , Luz , Dispersión de Radiación
11.
Opt Express ; 15(25): 16292-301, 2007 Dec 10.
Artículo en Inglés | MEDLINE | ID: mdl-19550918

RESUMEN

First observation of passive mode-locking in two-section quantum-dot lasers operating at wavelengths around 1.55 mum is reported. Pulse generation at 4.6 GHz from a 9 mm long device is verified by background-free autocorrelation, RF-spectra and real-time oscilloscope traces. The output pulses are stretched in time and heavily up-chirped with a value of 20 ps/nm, contrary to what is normally observed in passively mode-locked semiconductor lasers. The complete output spectrum is shown to be coherent over 10 nm. From a 7 mm long device Q-switching is observed over a large operating regime. The lasers have been realized using a fabrication technology that is compatible with further photonic integration. This makes the laser a promising candidate for e.g. a mode-comb generator in a complex photonic chip.

12.
Opt Express ; 14(21): 9716-27, 2006 Oct 16.
Artículo en Inglés | MEDLINE | ID: mdl-19529362

RESUMEN

We report on an extensive characterization of a 15GHz integrated bulk InGaAsP passively modelocked ring laser at 1530 nm. The laser is modelocked for a wide range of amplifier currents and reverse bias voltages on the saturable absorber. We have measured a timing jitter of 7.1 ps (20 kHz - 80 MHz), which is low for an all-active device using bulk material and due to the ring configuration. Measured output pulses are highly chirped, a FWHM bandwidth is obtained of up to 4.5 nm. Such lasers with high bandwidth pulses and compatible with active-passive integration are of great interest for OCDMA applications.

13.
Nature ; 432(7014): 206-9, 2004 Nov 11.
Artículo en Inglés | MEDLINE | ID: mdl-15538365

RESUMEN

The increasing speed of fibre-optic-based telecommunications has focused attention on high-speed optical processing of digital information. Complex optical processing requires a high-density, high-speed, low-power optical memory that can be integrated with planar semiconductor technology for buffering of decisions and telecommunication data. Recently, ring lasers with extremely small size and low operating power have been made, and we demonstrate here a memory element constructed by interconnecting these microscopic lasers. Our device occupies an area of 18 x 40 microm2 on an InP/InGaAsP photonic integrated circuit, and switches within 20 ps with 5.5 fJ optical switching energy. Simulations show that the element has the potential for much smaller dimensions and switching times. Large numbers of such memory elements can be densely integrated and interconnected on a photonic integrated circuit: fast digital optical information processing systems employing large-scale integration should now be viable.

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