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Publication Contactless Cost-effective Polarizer for mm-Wave Dielectric Rod Waveguide(IEEE, 2022-09-26) Kumar, Ashish; Gallego Cabo, Daniel; Headland, Daniel; Ali, Muhsin; Xenidis, Nikolaos; Lioubtchenko, Dmitri; Carpintero del Barrio, Guillermo; European CommissionWe present a method to control the polarization of guided waves in a mm-wave dielectric rod waveguide. A pair of optical posts is situated on either side of the waveguide, and this markedly raises the cutoff of the undesired mode. The isolation is 20 dB over a frequency span from (55-87) GHz. This can be viewed as a proof-of-concept for reconfigurable, general-purpose polarization control and dispersion engineering in mm-wave and terahertz-range dielectric waveguides.Publication Cascaded directional coupler-based polarization splitter/combiner on commercial silicon photonics integration platform(Society of Photo-Optical Instrumentation Engineers (SPIE), 2023-03-17) Spanidou, Kalliopi; Orbe Nava, Luis Jorge; González Guerrero, Luis; Hermann, Dan; Carpintero del Barrio, Guillermo; European Commission; Universidad Carlos III de MadridSilicon photonic (SiPho) platforms hold vast potential for providing multi-functional processing capabilities, such as filtering, mode-handling, modulation, etc. Structures for polarization manipulation have become essential elements to enhance channel capacity and to facilitate polarization multiplexing functions. Therefore, 1x2 polarization beam splitters (PBS) are introduced as polarization-division key building blocks based on a silicon-on-insulator (SOI) platform for separating/combining the fundamental modes. By cascading three bent directional couplers (DC), high-performance coupling characteristics can be obtained similar to those of asymmetric ones. A first-ever integration of this kind of PBS has been achieved utilizing Tower Semiconductor's PH18MA silicon photonics platform, which offers 180 nm SOI process technology. In this work, both output ports of the proposed PBS are being tested for polarization filtering across a polarization sweep. The advanced features of this integration process pave the way for next-generation coherent transceivers and aim to meet future optical interconnecting requirements. Furthermore, Synopsys OptoCompiler and the Photonic IC Design Flow, featured in Tower¿s process design kit (PDK), were used to design the devices.Publication Dual-polarization VCSEL-based optical frequency comb generation(Optical Society of America (OSA), 2015) Prior Cano, Estefania; Dios Fernández, Cristina de; Ortsiefer, Markus; Meissner, Peter; Acedo Gallardo, PabloOptical Frequency Comb Generators (OFCG) based on Cost of the Shelf (COTS) laser diodes (LDs) are interesting systems for many applications as they offer compactness and cost efficiency. However, the optical frequency span and the coherence of the modes is still a limiting factor when comparing to combs based on other laser technologies. Among LDs, Vertical-Cavity Surface-Emitting Lasers (VCSELs) under Gain Switching (GS) regime [1] produce record combs in terms of energy efficiency and mode coherence. GS is a well-known nonlinear technique to directly generate OFCGs from LDs.Publication Multi-octave spanning, absolute frequency, high resolution THz dual-comb spectrometer based on electro-optic modulators: first spectroscopic measurements(Optical Society of America, 2018-11-05) Jerez González, Borja; Betancur Pérez, Andrés Felipe; Martín Mateos, Pedro; Dios Fernández, Cristina de; Acedo Gallardo, PabloOur first and very recent results on a new approach to obtain compact and practical, multi-octave spanning, absolute frequency and high accuracy THz dual-comb spectrometers based on Electro-Optic modulators (EOMs) are reported. Two different schemes are described and evaluated with the final objective of obtaining a practical solution for THz spectroscopy and other applications in such frequency range.Publication Dynamics of dual-polarization VCSEL-based optical frequency combs including optical injection locking(2016-06) Prior Cano, Estefania; Dios Fernández, Cristina de; Criado Serrano, Ángel Rubén; Meissner, Peter; Ortsiefer, Markus; Acedo Gallardo, PabloPublication Frequency Tuning of Symmetric Colliding Pulse Mode-Locked Laser through Asymmetric Biasing Intra-Cavity Phase Modulators(2017-04-03) Lo, Mu Chieh; Guzmán Martínez, Robinson Cruzoe; Gordón Gallegos, Carlos Diego; Ali, Muhsin; Carpintero del Barrio, GuillermoIn this paper we report a multimode interference reflector (MIR)-based linear cavity mode-locked laser (MLL) operating in the telecom C-band with a repetition rate of 30 GHz as shown in Fig. 1. A pair of intra-cavity electro-optic phase modulators (EOPM) enables spectral tuning of the optical and the photo-detected RF spectrum. As an asymmetric bias voltage increases up to 6 V, the RF frequency shift reaches 3 MHz. This photonic integrated circuit (PIC) was rapidly prototyped using generic photonic integration technology platform via industrial Multi-Project Wafer (MPW) runPublication Sub-picosecond pulse and terahertz optical frequency comb generation by monolithically integrated linear mode-locked laser(The International Society For Optical (SPIE), 2017-05-17) Lo, Mu Chieh; Guzmán Martínez, Robinson Cruzoe; Ali, Muhsin; Santos, Rui; Agustin, Luc; Carpintero del Barrio, GuillermoWe report on a record broad 3-dB bandwidth of 14 nm (~1.8 THz around 1532 nm) optical frequency comb generated from a passively mode-locked quantum-well (QW) laser in the form of photonic integrated circuits through an InP generic photonic integration technology platform. This 21.5-GHz colliding-pulse mode-locked laser cavity is defined by two on-chip reflectors incorporating intracavity phase modulators followed by an out-of-cavity SOA as booster. Under certain operating conditions, an ultra-wide spectral bandwidth is achieved along with an autocorrelation trace confirming the mode locking nature exhibiting a pulse width of 0.35 ps. The beat note RF spectrum has a linewidth of sub-MHz and 35-dB SNR.Publication Tunable Mode-Locked Laser Photonic Integrated Circuit Using Intracavity Phase Modulators(Optical Society of America (OSA), 2017-04-15) Lo, Mu Chieh; Guzmán Martínez, Robinson Cruzoe; Gordón Gallegos, Carlos Diego; Carpintero del Barrio, GuillermoA 30 GHz mode-locked laser in PIC is presented using InP-based active-passive integration technology. The 2.8 mm long cavity contains phase modulators enabling sub-nm fine tuning of the lasing spectrum which is experimentally demonstrated.Publication Photonic Integrated Circuit Comprising Mode-Locked Laser and Pulse Interleaver for Wavelength Tunable THz Signal Generation(IEEE Press, 2016-10-31) Lo, Mu Chieh; Guzmán Martínez, Robinson Cruzoe; Gordón Gallegos, Carlos Diego; Carpintero del Barrio, GuillermoWe report a photonic chip comprising multiple colliding pulse mode-locked laser and delay line-assisted Mach-Zehnder interleaver to generate 350GHz wave signal. With this mode-locked laser fourth harmonics are obtained. The interleaver quadruples the repetition rate. An integrated phase modulator enables wavelength tuning up to 0.03nm.Publication Mode-locked Photonic Integrated Circuits for Millimeter and Terahertz Wave Wireless Communications(IEEE, 2016-08-08) Lo, Mu Chieh; Guzmán Martínez, Robinson Cruzoe; Gordón Gallegos, Carlos Diego; Carpintero del Barrio, GuillermoWe present a 160 GHz pulsed source, based on an on-chip repetition rate multiplier scheme to double the repetition rate of an 80 GHz multiple pulse colliding mode-locked (mCPM) laser. For the first time to our knowledge, we demonstrate the monolithic integration of the mCPM laser and the pulse rate multiplier structures, using a generic foundry approach. From a 20 GHz fundamental repetition rate we achieve a ×4 increase, up to 160 GHz. The FWHM pulsewidth of 160 GHz pulse train is 0.979 ps.Publication 1THz span optical frequency comb using VCSELs and off the Shelf expansion techniques(OSA Publishing, 2016-06-05) Prior Cano, Estefania; Criado Serrano, Ángel Rubén; Dios Fernández, Cristina de; Acedo Gallardo, Pablo; Meissner, Peter; Ortsiefer, MarkusWe show, to our knowledge, the broadest VCSEL-based optical frequency comb of 1THz in 20dB span, with 193teeth, obtained by cascading two expansion stages, one with two EO Modulators and the second based on HNLFPublication Optical fiber sensor of partial discharges in high voltage DC experiments(The International Society For Optical (SPIE), 2014) Búa-Núñez, Iago; Azcárraga-Ramos, C.G.; Posada Román, Julio Enrique; García Souto, José AntonioA setup simulating High Voltage DC (HVDC) transformers barriers was developed to demonstrate the effectiveness of an optical fiber (OF) sensor in detecting partial discharges (PD) under these peculiar conditions. Different PD detection techniques were compared: electrical methods, and acoustic methods. Standard piezoelectric sensors (R15i-AST) and the above mentioned OF sensors were used for acoustic detection. The OF sensor was able to detect PD acoustically with a sensitivity better than the other detection methods. The multichannel instrumentation system was tested in real HVDC conditions with the aim of analyzing the behavior of the insulation (mineral oil/pressboard).Publication Optical Frequency Comb Generator based on a Monolithically Integrated Ring Laser(2015-09) Corral, Vinicio; Guzmán Martínez, Robinson Cruzoe; Gordón Gallegos, Carlos Diego; Leijtens, Xaveer; Carpintero del Barrio, GuillermoWe report the demonstration of an optical-frequency comb generator based on a monolithically integrated ring laser. We have designed a device fabricated in a Multi-Project Wafer (MPW) run in an active/passive integration process from a generic building blocks. Chip fabrication has been carried out on the JePPIX technology platform, within the InP technology MPW run. A passive modelocked ring laser architecture is chosen, due to its ease of integration with other components to achieve photonic integrated circuits (PICs). The -10 dB span of the optical comb obtained is 8.75 nm (1.09 THz) with lines spaced by 10.1 GHz.Publication European Semiconductor Laser Workshop. Madrid, Spain, september 24-25th 2015: Abstract book(2015-09) Universidad Carlos III de MadridThe workshop provides the opportunity for informal discussions about recent advances and achievements in the field of semiconductor laser diodes, related devices and their applications. The workshop is arranged in the form of invited talks, contributed presentations, both oral and poster.Publication Calibration of a high spatial resolution laser two-color heterodyne interferometer for density profile measurements in the TJ-II stellarator(American Institute of Physics, 2008-10-01) Acedo Gallardo, Pablo; Pedreira Conchado, Pablo; Criado Serrano, Ángel Rubén; Lamela Rivera, Horacio; Sánchez, Miguel; Sánchez, JoaquínA high spatial resolution two-color (CO2, lambda=10.6 mum, He-Ne, lambda=633 nm) interferometer for density profile measurements in the TJ-II stellarator is under development and installation, based in the currently operational single channel two-color heterodyne interferometer. To achieve the objectives of 32 channels, with 4-5 mm lateral separation between plasma chords, careful design and calibration of the interferometric waveforms for both the measurement and vibration compensation wavelengths are undertaken. The first step has been to set up in our laboratories an expanded-beam heterodyne/homodyne interferometer to evaluate the quality of both interferometric wavefronts, a reported source of poor vibration compensation and thus low resolution in the density profile measurements. This novel interferometric setup has allowed us to calibrate the spatial resolution in the profile measurements resulting in ~2 mm lateral resolution in the reconstruction of the interferometric wavefront.