We report the demonstration of an optical-frequency comb generator based on a monolithically integrated ring laser fabricated in a multiproject wafer run in an active/passive integration process in a generic foundry using standardized building blocks. The device is based on a passive mode-locked ring laser architecture, which includes a Mach-Zehnder interferometer to flatten the spectral shape of the comb output. This structure allows monolithic integration with other optical components, such as optical filters for wavelength selection, or dual wavelength lasers for their stabilization. The results show a -10 dB span of the optical comb of 8.7 nm (1.08 THz), with comb spacing of 10.16 GHz. We also obtain a flatness of 44 lines within a 1.8 dB power variation.
We report the achievement of colliding pulse mode-locked (CPM) regimes on a novel on-chip mode locked laser diode (OCCP-MLLD). The advantage of the resonator structure that we present is that the end-mirrors are defined through multimode interference reflectors (MIRs), which provide precise control of the cavity length avoiding the need for cleaved facets. This simplifies positioning the saturable absorber at the center of the resonator to achieve the colliding pulse mode-locked regime and double the repetition rate, reaching the millimeter wave frequency range. An additional advantage is that the pulsed output is delivered within the Photonic Integrated Circuit chip for further processing (i.e. modulation). We demonstrate a colliding pulse passive mode locked regime with pulse widths below a picosecond (Δτ = 0.64 ps), timing jitter σT = 75 fs and amplitude noise NAM = 0.012 dBc. The samples were fabricated in a generic InP foundry service through multi-project wafer (MPW) runs.
En el presente artículo se analiza el impacto del uso de herramientas tecnológicas que permiten optimizar el proceso educativo de los cadetes de la Escuela Superior Militar Eloy Alfaro, en el área de Ciencias Exactas, en el contexto de la pandemia ocasionada por la COVID-19. Por esta razón, se decidió promover el uso de las Tecnologías de la Información y las Comunicaciones para continuar las labores, mientras persistió la declaratoria de los estados de excepción decretados por el gobierno nacional y el distanciamiento social; adecuando los procesos de enseñanza y aprendizaje, así como las técnicas de evaluación. Para ello, se utilizaron varias metodologías de enseñanza o tele-educación (e-learning). Se usó el Zoom para dictar las clases virtuales de Ciencias Exactas y se utilizaron las herramientas de Google Suite para evaluación y coordinación entre profesores y estudiantes. También se acudió a la aplicación del OneNote y pizarras digitales, que facilitan la enseñanza de la asignatura, en forma virtual. Se presenta el análisis estadístico y los resultados de evaluación obtenidos y se confirma que el uso de las herramientas tecnológicas usadas para dictar las clases en forma virtual, son efectivas ya que no existe mayor variación en el promedio alcanzado en años lectivos anteriores a la pandemia. También se verifica la necesidad de que los procesos involucrados en la transformación digital se implementen en la ESMIL, con el objetivo de mejorar las estrategias de enseñanza – aprendizaje y se promueva un ambiente de aprendizaje inteligente.
We present the results of the photonic integrated circuit measurements in order to implement an optical frequency comb generator (OFCG) based on a recirculating ring using electro-optic phase modulators (EOPM). The design is established on the functional blocks of the OCLARO Tech generic integration platform. The optical comb produces multiple wavelengths, equally spaced by the input RF frequency provided by an external synthesizer from a seed wavelength. This λ seed can be of external or internal (on-chip) character, by means of a DBR (Distributed Bragg Reflector) single mode laser in order to develop a fully integrated OFCG. This structure is compact and small (6 x 2 mm), whose elements are interconnected with InP waveguides that replaces the optical fiber, avoiding thermal variations that affect the generated signal. For our knowledge, this is the first time that measurements are made on this type of structures.
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