Robinson Guzman | Universidad Carlos III de Madrid (original) (raw)

Papers by Robinson Guzman

Advanced Photonics 2018 (BGPP, IPR, NP, NOMA, Sensors, Networks, SPPCom, SOF)

2018 European Conference on Optical Communication (ECOC)

An InP-based monolithic quantum well semiconductor ring laser is presented to generate ultrafast ... more An InP-based monolithic quantum well semiconductor ring laser is presented to generate ultrafast pulses under 0.5 ps and optical frequency combs spanning over 12 nm with >30-d8 longitudinal mode suppression around the telecom C-band.

We present the first photonic integrated circuit for microwave photonic application, implementing... more We present the first photonic integrated circuit for microwave photonic application, implementing signal generation based on the external modulation technique. The quality of the signal is determined by the reference oscillator, which is multiplied by a factor of 2.

2018 25th International Conference on Telecommunications (ICT)

We report on the development of a compact quasioptical zero-bias Schottky barrier diode (QO-SBD) ... more We report on the development of a compact quasioptical zero-bias Schottky barrier diode (QO-SBD) envelope detector for mmWave/sub-THz frequencies. The detector consists of a Schottky diode mounted on a self-complementary bowtie antenna mounted over a hyper-hemispherical silicon lens. The device is optimised to be used for multi-Gbps wireless communication systems. To increase the video bandwidth of the receiver, a wideband impedance matching network is designed and integrated. Measurements show that a 3-dB video bandwidth of 10GHz is realised for the proposed receiver, which is the highest value achieved for a wide-band QO-type detector.

We present a novel fully monolithic Colliding Pulse Mode-Locked Laser Diode (CPML) using Multimod... more We present a novel fully monolithic Colliding Pulse Mode-Locked Laser Diode (CPML) using Multimode Interference Reflectors (MMIRs) to create the laser resonator. We demonstrate experimentally for the first time to our knowledge the Colliding Pulse mode-locking of a laser using MMIRs by observation of the Optical Spectrum and by measuring the frequency spacing between the modes. This component is a promising candidate for Stable Millimeter-Wave Generation in ultra-wideband wireless communication links. Multimode Interference Reflectors are very versatile components that allow avoiding the required cleaved facets to operate.

Millimeter-waves (30-300 GHz) have interest due to the wide bandwidths available for carrying inf... more Millimeter-waves (30-300 GHz) have interest due to the wide bandwidths available for carrying information, enabling broadband wireless communications. Photonics is a key technology for millimeter wave signal generation, recently demonstrating the use of photonic integration to reduce size and cost. In this paper, we present two dual-wavelength Photonic Integrated Circuit (PIC) structures designed for signal generation using the optical heterodyne technique. We demonstrate a 1 Gbps data rate wireless link that does not require any stabilization scheme to lock the two wavelengths. Both integrated dual-wavelength sources are based on an Arrayed Waveguide Grating element. A novel building block-Multimode Interference Reflectors (MIRs) - is used to integrate on-chip one of these structures, without need of cleaved facets to define the laser cavity. This fact enables us to locate any of these structures at any location within the photonic chip.

2017 IEEE Photonics Conference (IPC), 2017

We report the experimental optimization of the absorber length of the on-chip colliding pulse mod... more We report the experimental optimization of the absorber length of the on-chip colliding pulse mode-locked semiconductor laser working at 50 GHz repetition rate. The fundamental approach is that the active-passive integration provides freedom to choose the desired gain section to saturable absorber length ratio optimized.

2018 25th International Conference on Telecommunications (ICT), 2018

We report on the development of a compact quasioptical zero-bias Schottky barrier diode (QO-SBD) ... more We report on the development of a compact quasioptical zero-bias Schottky barrier diode (QO-SBD) envelope detector for mmWave/sub-THz frequencies. The detector consists of a Schottky diode mounted on a self-complementary bowtie antenna mounted over a hyper-hemispherical silicon lens. The device is optimised to be used for multi-Gbps wireless communication systems. To increase the video bandwidth of the receiver, a wideband impedance matching network is designed and integrated. Measurements show that a 3-dB video bandwidth of 10GHz is realised for the proposed receiver, which is the highest value achieved for a wide-band QO-type detector.

We present two difierent photonic integrated circuits aimed to generate electrical signals within... more We present two difierent photonic integrated circuits aimed to generate electrical signals within the microwave and millimeter wave range with two difierent techniques. The flrst approach uses the heterodyne technique, implementing a monolithic dual wavelength source by integrating on a single chip two distributed feedback (DFB) lasers together with the high speed photodiode. The second approach, using mode locked lasers, describes a novel device structure based on multimode interference re∞ectors (MIR).

2020 International Topical Meeting on Microwave Photonics (MWP), 2020

In this work we report an asymmetric mode-locked photonic integrated circuit (ML-PIC) with a 33 G... more In this work we report an asymmetric mode-locked photonic integrated circuit (ML-PIC) with a 33 GHz fundamental repetition rate (RR) frequency. The device has been fabricated in an Indium Phosphide (InP) photonic integrated Multi-Project Wafer (MPW) run. The design in an on-chip mode locked laser diode using a pair of on-chip reflectors, two semiconductor optical amplifier sections and one saturable absorber section, asymmetrically located with respect to the reflectors. The ML-PIC pulses are generated at the 33GHz fundamental frequency exhibiting a 3dB-linewidth around 417 kHz with a drift around 1 MHz measured over 5 minutes in passive operation regime.

Multi-wavelength laser sources based on Arrayed waveguide grating have been shown in order to pro... more Multi-wavelength laser sources based on Arrayed waveguide grating have been shown in order to provide simultaneously multiples wavelengths with a narrow optical linewidth. Two different laser structures have been developed for the millimeter wave signal generation, monolithically integrated using photonic integrated circuits. In this work we report the characteristics of the heterodyne signal in the millimeter wave range. The optical linewidth measured from the modes generated by different channels on each structure can become less than 150 KHz. Beating the two wavelengths from any of these chips on a high speed photodiode resulted in a beat note having a linewidth less than 250 kHz, which is the narrowest beat-note measured from free running monolithic semiconductor dual wavelength sources.

2017 Progress in Electromagnetics Research Symposium - Fall (PIERS - FALL), 2017

An on-chip self-heterodyne terahertz spectrometer is presented along with a test structure experi... more An on-chip self-heterodyne terahertz spectrometer is presented along with a test structure experimentally demonstrated for evaluating the performance of individual building blocks that constitute the spectrometer. The waveguide crossing exhibits an insertion loss of 0.6dB and the DFB laser exhibits a wavelength tuning range of 5.98nm limited by the bias current.

A photonic integrated circuit developed in a generic foundry platform for continuously tunable mi... more A photonic integrated circuit developed in a generic foundry platform for continuously tunable microwave generation is presented. On this chip, two single-wavelength DFB laser diodes generate a two-tone emission through one optical waveguide coupler as combiner. The two-tone emission spectrum with >50-dB suppression ratio exhibits a continuous wavelength offset tunability up to ~4.3 nm, corresponding to 0.55-THz. With an external photodiode, a RF beat note at 10 GHz is experimentally demonstrated..

Among the photonic techniques to generate RF signals, optical heterodyning ispreferred for wide f... more Among the photonic techniques to generate RF signals, optical heterodyning ispreferred for wide frequency tuning. It combines two single wavelength laser sources, which behave as uncorrelated sources, afecting the sability of the generated signal. Two integration approaches are investigated, monolithic InP and heterogeneous In/Polymer.

A monolithic integrated 2.8-mm colliding-pulse mode-locked laser is demonstrated to emit optical ... more A monolithic integrated 2.8-mm colliding-pulse mode-locked laser is demonstrated to emit optical combs with switchable mode spacing for millimeter-wave generation. By selecting the DC-bias condition, the laser is forced to operate in harmonic mode locking regimes. Optical frequency combs with mode spacing of 2nd (30 GHz), 3rd (45 GHz), 4th (60 GHz) and 6th (90 GHz) harmonics are presented. The autocorrelation trace of 2nd harmonic exhibits a 1.03-ps pulsewidth. The beat note of 4th harmonic has an RF linewidth of 520 kHz.

A monolithically integrated mode-locked laser cavity design with coupled feedback is proposed. It... more A monolithically integrated mode-locked laser cavity design with coupled feedback is proposed. It features switchable repetition rate. Optical frequency combs with mode spacing of 50 and 100 GHz are demonstrated. 350-GHz and 450GHz pulse trains are shown through autocorrelation traces.

This paper presents a concept of photonic emitter (PE) for high speed radio-over-fiber (RoF) wire... more This paper presents a concept of photonic emitter (PE) for high speed radio-over-fiber (RoF) wireless communication applications in E-band frequencies. It consists of a high frequency indium phosphide-based photodiode with coplanar waveguide (CPW) output contact pads coupled to a planar antenna. We design a highly directive corrugated tapered slot antenna (TSA) with CPW-to-slotline transition on Rogers RT/Duroid 5880 substrate. The proposed PE is optimised to operate in E-band frequency range, with theoretical gain of 14.5dBi and sidelobe levels as low as −18dB. The proposed concept serves as platform for optoelectronic integration of RoF front-end.

We present different types of optical frequency comb structures based on mode-locked lasers, fabr... more We present different types of optical frequency comb structures based on mode-locked lasers, fabricated on generic platform, as high coherence sources for OFDM. The optical signal does not require cleaved facets, which enables the use of integrated optical multiplexers/demultiplexers to modulate each wavelength separately on the same chip. In addition, the presented comb structures feature wide spectral bandwidth and mode spacing selectability.

We present two different types of integrated optical frequency comb structures, based on mode-loc... more We present two different types of integrated optical frequency comb structures, based on mode-locked lasers, fabricated on an indium phosphide generic technology platform. The structures present the particular feature that do not require cleaved facets, enabled by on-chip mirrors. The presented comb structures feature wide spectral bandwidth and mode spacing selectability.

This paper describes the detailed characterization of a novel InP-Si3N4 dual laser module with re... more This paper describes the detailed characterization of a novel InP-Si3N4 dual laser module with results revealing relative intensity noise (RIN) as low as -165 dB/Hz and wide wavelength tunability (100 nm). The hybrid coupled laser is deployed in an unamplified 28 GBd 8 level pulse amplitude modulation (PAM) short-reach data center (DC) transmission system. System performance, which is experimentally evaluated in terms of received signal bit error ratio (BER), demonstrates the ability of the proposed laser module to support PAM-8 transmission across a 100 nm tuning range with less than 1 dB variance in receiver sensitivity over the operating wavelength range. Comparative performance studies not only indicate that the proposed source can outperform a commercial external cavity laser (ECL) in an intensity modulation/direct detection (IM/DD) link but also highlight the critical impact of RIN in the design of advanced modulation short-reach systems.

Advanced Photonics 2018 (BGPP, IPR, NP, NOMA, Sensors, Networks, SPPCom, SOF)

2018 European Conference on Optical Communication (ECOC)

An InP-based monolithic quantum well semiconductor ring laser is presented to generate ultrafast ... more An InP-based monolithic quantum well semiconductor ring laser is presented to generate ultrafast pulses under 0.5 ps and optical frequency combs spanning over 12 nm with >30-d8 longitudinal mode suppression around the telecom C-band.

We present the first photonic integrated circuit for microwave photonic application, implementing... more We present the first photonic integrated circuit for microwave photonic application, implementing signal generation based on the external modulation technique. The quality of the signal is determined by the reference oscillator, which is multiplied by a factor of 2.

2018 25th International Conference on Telecommunications (ICT)

We report on the development of a compact quasioptical zero-bias Schottky barrier diode (QO-SBD) ... more We report on the development of a compact quasioptical zero-bias Schottky barrier diode (QO-SBD) envelope detector for mmWave/sub-THz frequencies. The detector consists of a Schottky diode mounted on a self-complementary bowtie antenna mounted over a hyper-hemispherical silicon lens. The device is optimised to be used for multi-Gbps wireless communication systems. To increase the video bandwidth of the receiver, a wideband impedance matching network is designed and integrated. Measurements show that a 3-dB video bandwidth of 10GHz is realised for the proposed receiver, which is the highest value achieved for a wide-band QO-type detector.

We present a novel fully monolithic Colliding Pulse Mode-Locked Laser Diode (CPML) using Multimod... more We present a novel fully monolithic Colliding Pulse Mode-Locked Laser Diode (CPML) using Multimode Interference Reflectors (MMIRs) to create the laser resonator. We demonstrate experimentally for the first time to our knowledge the Colliding Pulse mode-locking of a laser using MMIRs by observation of the Optical Spectrum and by measuring the frequency spacing between the modes. This component is a promising candidate for Stable Millimeter-Wave Generation in ultra-wideband wireless communication links. Multimode Interference Reflectors are very versatile components that allow avoiding the required cleaved facets to operate.

Millimeter-waves (30-300 GHz) have interest due to the wide bandwidths available for carrying inf... more Millimeter-waves (30-300 GHz) have interest due to the wide bandwidths available for carrying information, enabling broadband wireless communications. Photonics is a key technology for millimeter wave signal generation, recently demonstrating the use of photonic integration to reduce size and cost. In this paper, we present two dual-wavelength Photonic Integrated Circuit (PIC) structures designed for signal generation using the optical heterodyne technique. We demonstrate a 1 Gbps data rate wireless link that does not require any stabilization scheme to lock the two wavelengths. Both integrated dual-wavelength sources are based on an Arrayed Waveguide Grating element. A novel building block-Multimode Interference Reflectors (MIRs) - is used to integrate on-chip one of these structures, without need of cleaved facets to define the laser cavity. This fact enables us to locate any of these structures at any location within the photonic chip.

2017 IEEE Photonics Conference (IPC), 2017

We report the experimental optimization of the absorber length of the on-chip colliding pulse mod... more We report the experimental optimization of the absorber length of the on-chip colliding pulse mode-locked semiconductor laser working at 50 GHz repetition rate. The fundamental approach is that the active-passive integration provides freedom to choose the desired gain section to saturable absorber length ratio optimized.

2018 25th International Conference on Telecommunications (ICT), 2018

We report on the development of a compact quasioptical zero-bias Schottky barrier diode (QO-SBD) ... more We report on the development of a compact quasioptical zero-bias Schottky barrier diode (QO-SBD) envelope detector for mmWave/sub-THz frequencies. The detector consists of a Schottky diode mounted on a self-complementary bowtie antenna mounted over a hyper-hemispherical silicon lens. The device is optimised to be used for multi-Gbps wireless communication systems. To increase the video bandwidth of the receiver, a wideband impedance matching network is designed and integrated. Measurements show that a 3-dB video bandwidth of 10GHz is realised for the proposed receiver, which is the highest value achieved for a wide-band QO-type detector.

We present two difierent photonic integrated circuits aimed to generate electrical signals within... more We present two difierent photonic integrated circuits aimed to generate electrical signals within the microwave and millimeter wave range with two difierent techniques. The flrst approach uses the heterodyne technique, implementing a monolithic dual wavelength source by integrating on a single chip two distributed feedback (DFB) lasers together with the high speed photodiode. The second approach, using mode locked lasers, describes a novel device structure based on multimode interference re∞ectors (MIR).

2020 International Topical Meeting on Microwave Photonics (MWP), 2020

In this work we report an asymmetric mode-locked photonic integrated circuit (ML-PIC) with a 33 G... more In this work we report an asymmetric mode-locked photonic integrated circuit (ML-PIC) with a 33 GHz fundamental repetition rate (RR) frequency. The device has been fabricated in an Indium Phosphide (InP) photonic integrated Multi-Project Wafer (MPW) run. The design in an on-chip mode locked laser diode using a pair of on-chip reflectors, two semiconductor optical amplifier sections and one saturable absorber section, asymmetrically located with respect to the reflectors. The ML-PIC pulses are generated at the 33GHz fundamental frequency exhibiting a 3dB-linewidth around 417 kHz with a drift around 1 MHz measured over 5 minutes in passive operation regime.

Multi-wavelength laser sources based on Arrayed waveguide grating have been shown in order to pro... more Multi-wavelength laser sources based on Arrayed waveguide grating have been shown in order to provide simultaneously multiples wavelengths with a narrow optical linewidth. Two different laser structures have been developed for the millimeter wave signal generation, monolithically integrated using photonic integrated circuits. In this work we report the characteristics of the heterodyne signal in the millimeter wave range. The optical linewidth measured from the modes generated by different channels on each structure can become less than 150 KHz. Beating the two wavelengths from any of these chips on a high speed photodiode resulted in a beat note having a linewidth less than 250 kHz, which is the narrowest beat-note measured from free running monolithic semiconductor dual wavelength sources.

2017 Progress in Electromagnetics Research Symposium - Fall (PIERS - FALL), 2017

An on-chip self-heterodyne terahertz spectrometer is presented along with a test structure experi... more An on-chip self-heterodyne terahertz spectrometer is presented along with a test structure experimentally demonstrated for evaluating the performance of individual building blocks that constitute the spectrometer. The waveguide crossing exhibits an insertion loss of 0.6dB and the DFB laser exhibits a wavelength tuning range of 5.98nm limited by the bias current.

A photonic integrated circuit developed in a generic foundry platform for continuously tunable mi... more A photonic integrated circuit developed in a generic foundry platform for continuously tunable microwave generation is presented. On this chip, two single-wavelength DFB laser diodes generate a two-tone emission through one optical waveguide coupler as combiner. The two-tone emission spectrum with >50-dB suppression ratio exhibits a continuous wavelength offset tunability up to ~4.3 nm, corresponding to 0.55-THz. With an external photodiode, a RF beat note at 10 GHz is experimentally demonstrated..

Among the photonic techniques to generate RF signals, optical heterodyning ispreferred for wide f... more Among the photonic techniques to generate RF signals, optical heterodyning ispreferred for wide frequency tuning. It combines two single wavelength laser sources, which behave as uncorrelated sources, afecting the sability of the generated signal. Two integration approaches are investigated, monolithic InP and heterogeneous In/Polymer.

A monolithic integrated 2.8-mm colliding-pulse mode-locked laser is demonstrated to emit optical ... more A monolithic integrated 2.8-mm colliding-pulse mode-locked laser is demonstrated to emit optical combs with switchable mode spacing for millimeter-wave generation. By selecting the DC-bias condition, the laser is forced to operate in harmonic mode locking regimes. Optical frequency combs with mode spacing of 2nd (30 GHz), 3rd (45 GHz), 4th (60 GHz) and 6th (90 GHz) harmonics are presented. The autocorrelation trace of 2nd harmonic exhibits a 1.03-ps pulsewidth. The beat note of 4th harmonic has an RF linewidth of 520 kHz.

A monolithically integrated mode-locked laser cavity design with coupled feedback is proposed. It... more A monolithically integrated mode-locked laser cavity design with coupled feedback is proposed. It features switchable repetition rate. Optical frequency combs with mode spacing of 50 and 100 GHz are demonstrated. 350-GHz and 450GHz pulse trains are shown through autocorrelation traces.

This paper presents a concept of photonic emitter (PE) for high speed radio-over-fiber (RoF) wire... more This paper presents a concept of photonic emitter (PE) for high speed radio-over-fiber (RoF) wireless communication applications in E-band frequencies. It consists of a high frequency indium phosphide-based photodiode with coplanar waveguide (CPW) output contact pads coupled to a planar antenna. We design a highly directive corrugated tapered slot antenna (TSA) with CPW-to-slotline transition on Rogers RT/Duroid 5880 substrate. The proposed PE is optimised to operate in E-band frequency range, with theoretical gain of 14.5dBi and sidelobe levels as low as −18dB. The proposed concept serves as platform for optoelectronic integration of RoF front-end.

We present different types of optical frequency comb structures based on mode-locked lasers, fabr... more We present different types of optical frequency comb structures based on mode-locked lasers, fabricated on generic platform, as high coherence sources for OFDM. The optical signal does not require cleaved facets, which enables the use of integrated optical multiplexers/demultiplexers to modulate each wavelength separately on the same chip. In addition, the presented comb structures feature wide spectral bandwidth and mode spacing selectability.

We present two different types of integrated optical frequency comb structures, based on mode-loc... more We present two different types of integrated optical frequency comb structures, based on mode-locked lasers, fabricated on an indium phosphide generic technology platform. The structures present the particular feature that do not require cleaved facets, enabled by on-chip mirrors. The presented comb structures feature wide spectral bandwidth and mode spacing selectability.

This paper describes the detailed characterization of a novel InP-Si3N4 dual laser module with re... more This paper describes the detailed characterization of a novel InP-Si3N4 dual laser module with results revealing relative intensity noise (RIN) as low as -165 dB/Hz and wide wavelength tunability (100 nm). The hybrid coupled laser is deployed in an unamplified 28 GBd 8 level pulse amplitude modulation (PAM) short-reach data center (DC) transmission system. System performance, which is experimentally evaluated in terms of received signal bit error ratio (BER), demonstrates the ability of the proposed laser module to support PAM-8 transmission across a 100 nm tuning range with less than 1 dB variance in receiver sensitivity over the operating wavelength range. Comparative performance studies not only indicate that the proposed source can outperform a commercial external cavity laser (ECL) in an intensity modulation/direct detection (IM/DD) link but also highlight the critical impact of RIN in the design of advanced modulation short-reach systems.