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By a simple femtosecond laser process, we fabricated metal-oxide/gold composite films for electrical and optical gas sensors. We designed a dripple wavelength AWG-spectrometer, matched to the plasma absorption wavelength region of the composite films. H2/CO absorptions fit well with the AWG design for multi gas detection sensor arrays
This article aims to compare different types of optical amplifiers implemented in metropolitan xWDM-PON networks. The first part is an analysis of the issue with the focus on the used optical access network based on xWDM-PON. In the next part the deployment of optical amplifiers (SOA, EDFA and Raman) into the network and their analysis is presented. The following part is dedicated to the simulation of WDM-PON networks in the OptiSystem tool from Optiwave, with applied appropriate optical amplifier for chosen channels. In the last part, the simulated results (based on optical power, BER, Q-factor, eye-diagram and spectral analysis) are evaluated and discussed.
The paper deals with designing and verifying the technological procedure of quasi-planar fiber array assembly to PCB by mechanical optical interface PRIZM® LightTurn®. Mechanical optical interface allows excellent fiber array coupling to the VCSEL or photodiode array up to 12 elements. By image processing from its two CCD cameras, the spatial positions of the centre of the elements array on the PCB and the centre of the mounted mechanical optical interface on the 6D position stage are detected. After this detection, they are then mutually adjusted to the optimal relative position in 3D space by active adjustment to the maximum optical powers of the two outermost optical fibres of the fiber array. Subsequently, the mechanical optical interface is fixed by UV-A curable adhesive to the PCB through its four hollow feet designed for this. The technological process is designed and optimized for the Fiber Line 300 machine from Ficontec, GmbH.
We present the design of a 16-channel 100 GHz colorless AWG multiplexer/demultiplexer. The AWG was designed for the central wavelength of 1550 nm and simulated in the wavelength range 1500 nm - 1600 nm. The AWG was designed using the specially developed standalone tool “AWG-Parameters”. The AWG structure was created and simulated using two different commercial photonics design tools. The simulated transmission characteristics and calculated transmission parameters are discussed in detail and compared with each other.
This study presents different approaches to increase the sensing area of NiO based semiconducting metal oxide gas sensors. Micro- and nanopatterned laser induced periodic surface structures (LIPSS) are generated on silicon and Si/SiO2 substrates. The surface morphologies of the fabricated samples are examined by FE SEM. We select the silicon samples with an intermediate Si3N4 layer due to its superior isolation quality over the thermal oxide for evaluating the hydrogen and acetone sensitivity of a NiO based test sensor.
This paper presents design, simulation, and optimization of the three-dimensional 1×4 optical multimode interference splitter using IP-Dip polymer as a core and polydimethylsiloxane (PDMS) Sylgard 184 as a cladding. The splitter was simulated by using beam propagation method in BeamPROP simulation engine of RSoft photonic tool and optimized for an operating wavelength of 1.55 µm. According to the minimum insertion loss, the dimensions of the MMI coupler and the length of the whole MMI splitter structure were optimized applying a waveguide with a core size of 4×4 µm2. The objective of the study is to create a design for fabrication by three-dimensional direct laser writing optical lithography.
Design, simulation, and optimization of the 1×4 optical three-dimensional multimode interference splitter using IP-Dip polymer as a core and polydimethylsiloxane (PDMS) Sylgard 184 as a cladding is demonstrated. The splitter was simulated by using beam propagation method in BeamPROP simulation module of RSoft photonic tool and optimized for an operating wavelength of 1.55 μm . According to the minimum insertion loss, the dimensions of the splitter were optimized for a waveguide with a core size of 4×4 μm2 . The objective of the study is to create the design for fabrication by three-dimensional direct laser writing optical lithography.
We present design of planar 16-channel, 100-GHz multi-mode polymer-based AWG. This AWG was designed for central wavelength of 1550 nm applying AWG-Parameters tool. The AWG structure was created and simulated in the commercial photonic tool PHASAR from Optiwave. Achieved transmission characteristics were evaluated by AWG-Analyzer tool. For the design, multi-mode waveguides having a cross-section of (4x4) µm2 were used. The simulated results show strong worsening of the transmission characteristics in comparison when using single-mode waveguides. Nevertheless, the transmitting channels are clearly separated. The reason for using thicker multi-mode waveguides in the design is possibility to fabricate the AWG structure on polymer basis using direct laser writing lithography.
Optoelectronic system based on photonic integrated circuits to miniaturize spectral domain OCT
(2023)
We present a miniaturized optical coherence tomography (OCT) setup based on photonic integrated circuits (PIC) for the 850 nm range. We designed a 512-channel arrayed waveguide grating (AWG) on a PIC for spectral domain OCT (SD-OCT) that is co-integrated with PIN-photodiodes and analog-to-digital-converters on one single chip. This image sensor is combined with all the necessary electronics to act as a camera. It is integrated into a fiber-based OCT system, achieving a sensitivity of >80dB and various samples are imaged. This optoelectronic system will allow building small and cost-effective OCT systems to monitor retinal diseases.
The main aims of this work are the validation of the developed process of gluing a single-mode optical fiber array with a photonic chip and the selection of a more suitable adhesive from the two adhesives being compared. An active alignment system was used for adjusting the two optical fiber arrays to a photonics chip. The gluing was done by two compared UV curable adhesives applied in the optical path. The insertion losses of glued coupling were measured and investigated at two discrete wavelengths 1310 nm and 1550 nm during temperature testing in the climatic chamber according to Telcordia GR_1209_Corei04 [3]. The measurement, investigation, and comparison of insertion losses of the glued coupling at the spectral band from 1530 nm to 1570 nm were done immediately after gluing process and after three temperature cycles in the climatic chamber with one month delay.
