Rocío Baños

Reflective arrayed waveguide gratings based on Sagnac loop reflectors with custom spectral response

In this paper, a model for the analysis and design of a reflective Arrayed Waveguide Grating is presented. The device consists of one half of a regular AWG where each arm waveguide in the array is terminated with a phase shifter and a Sagnac loop reflector. By individually adjusting the phase shifter and Sagnac reflectivity in each arm, additional functionality to that previously reported in the literature is attained, since this enables tailoring the spectral response of the AWG. The design and experimental demonstration of Gaussian pass-band shape devices in Silicon-on-Insulator technology are reported. Methods to obtain flattened and arbitrary spectral responses are described and supported by simulation results.

WDM-Coherent OCDMA over one single device based on short chip Super structured fiber Bragg gratings

We theoretically propose and demonstrate experimentally a Coherent Direct Sequence OCDMA en/decoder for multi-channel WDM operation based on a single device. It presents a broadband spectral envelope and a periodic spectral pattern that can be employed for en/decoding multiple sub-bands simultaneously. Multi-channel operation is verified experimentally by means of Multi-Band Super Structured Fiber Bragg Gratings with binary phase encoded chips fabricated with 1mm inter-chip separation that provides 4x100 GHz ITU sub-band separation at 1.25 Gbps. The WDM-OCDMA system verification was carried out employing simultaneous encoding of four adjacent sub-bands and two different OCDMA codes.

Chromatic dispersion compensation and coherent Direct-Sequence OCDMA operation on a single super structured FBG

We have proposed, fabricated and demonstrated experimentally a set of Coherent Direct Sequence-OCDMA en/decoders based on Super Structured Fiber Bragg Gratings (SSFBGs) which are able to compensate the fiber chromatic dispersion at the same time that they perform the en/decoding task. The proposed devices avoid the use of additional dispersion compensation stages reducing system complexity and losses. This performance was evaluated for 5.4, 11.4 and 16.8 km of SSMF. The twofold performance was verified in Low Reflectivity regime employing only one GVD compensating device at decoder or sharing out the function between encoder and decoder devices. Shared functionality requires shorter SSFBGs designs and also provides added flexibility to the optical network design. Moreover, dispersion compensated en/decoders were also designed into the High Reflectivity regime employing synthesis methods achieving more than 9 dB reduction of insertion loss for each device.

Silicon Nitride Photonic Integration Platforms for Visible, Near-Infrared and Mid-Infrared Applications

Silicon nitride photonics is on the rise owing to the broadband nature of the material, allowing applications of biophotonics, tele/datacom, optical signal processing and sensing, from visible, through near to mid-infrared wavelengths. In this paper, a review of the state of the art of silicon nitride strip waveguide platforms is provided, alongside the experimental results on the development of a versatile 300 nm guiding film height silicon nitride platform.

Spectral efficiency in WDM-OCDMA Coherent Direct Sequence encoder/decoder devices based on fiber bragg gratings

We present theoretical discussion and experimental verification of spectral efficiency and crosstalk for different global envelope Coherent Direct Sequence en/decoders used in WDM-OCDMA applications. We measure the spectral efficiency in function of the WDM channel spacing. Moreover, simulated and experimental results of the devices in presence of chromatic dispersion are presented.

Multi-channel en/decoding devices for WDM - Coherent Direct Sequence OCDMA applications based on Super Structured Fibre Bragg Gratings

We propose and demonstrate experimentally a Coherent Direct Sequence OCDMA en/decoder that presents a broadband spectral envelope and a periodic spectral pattern inside the main lobe that can be employed for en/decoding multiple sub-bands simultaneously. Multi-channel operation is verified experimentally by means of Multi-Band Super Structured Fibre Bragg Gratings with binary phase encoded chips fabricated with 1 mm inter-chip separation that provides 100 GHz ITU sub-band separation. The WDM-OCDMA system verification was carried out employing simultaneous encoding of two adjacent sub-bands and two different OCDMA codes.

Simultaneous chromatic dispersion compensation and coherent direct-sequence OCDMA encoding on a single SSFBG device

In this paper we demonstrate experimentally for the first time of our knowledge an especial Coherent Direct Sequence-OCDMA encoder based on a specially designed Super Structured Fiber Bragg Grating (SSFBG) that provides the standard encoding functionalities of SSFBGs added to Group Velocity Dispersion compensation for 11 km of SSMF in the same device. The proposed devices avoid the use of additional dispersion compensation stages at the receiver end reducing system complexity and losses.

Coherent optical en/decoding employing discrete prolate spheroidal sequences based super structured FBGs

We present the first experimental verification of the coherent optical en/decoding employing Super-Structured Fibre Bragg Gratings performing Discrete Prolate Spheroidal Sequences (DPSS). These devices present promising spectral and temporal characteristics for OCDMA networks and optical encryption applications.

An integrated optoelectronic oscillator

An integrated optoelectronic Oscillator (IOEO) which combines the integrated technologies of photonics and electronics has been developed. All of the necessary elements (for example, laser, photo-detector, electrical amplifier, electrical filter, etc.) have been assembled on a print circuit board (PCB) within size of 5∗6 cm. To the best of our knowledge, it is the first time to integrate both the optical part and electrical part on a single substrate. Finally, a stable microwave signal with the frequency of 7.3 GHz is obtained. The center oscillation frequency can be slightly tuned in 20 MHz bandwidth by strictly tuning the injection current. The phase noise is around −91dBc/Hz at 1MHz.

Characterization of Microring Filters for Differential Group Delay Applications

The longitudinal offset technique permits to improve the accuracy of the coupling coefficients of integrated directional couplers and provides designs that can be easily implemented with current fabrication tolerances. In this paper, we address the additional degree of freedom offered by this technology in order to tailor the differential group delay in coupled-resonator optical filters. We present the characterization of several devices exploiting this feature and we discuss their potential applications.