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Selected Papers from the 25th Optoelectronics and Communications Conference (OECC2020)
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Selected Papers from the 25th Optoelectronics and Communications Conference (OECC2020)

A special issue of Sensors (ISSN 1424-8220). This special issue belongs to the section "Optical Sensors".

Deadline for manuscript submissions: closed (20 February 2022) | Viewed by 13317

Special Issue Editors

Prof. Dr. Kimio Oguchi

E-Mail Website
Guest Editor
Department of Electronic and Computer Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan
Interests: sensor networks; sensor applications; optical networks
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Sheng-Lung Huang

E-Mail Website
Guest Editor
Department of Electrical Engineering, National Taiwan University, Taipei, Taiwan
Interests: biomedical sensing; fiber-optic sensing
Prof. Dr. Shien-Kuei Liaw

E-Mail Website
Guest Editor
Department of Electronic and Computer Engineering, National Taiwan University of Science and Technology, Taipei 10671 Taiwan
Interests: optical communication; fiber laser and fiber amplifier; fiber sensing; WDM PON; optical wireless communications
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Pinghui Sophia Yeh

E-Mail Website
Guest Editor
Department of Electronic and Computer Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan
Interests: optical sensors; sensor integration

Special Issue Information

Dear Colleagues,

The 25th Optoelectronics and Communications Conference (OECC 2020) will be held in Taipei, Taiwan, 4–8 October, 2020. The first OECC was held in Chiba, Japan, 1996, as an annual conference for researchers and engineers working in the fields of optoelectronics, optical fiber transmission, and photonic network systems in the Asia Pacific region to report, discuss, exchange, and generate ideas which advance the disciplines of optoelectronics and optical communications.

OECC 2020 will continue in the footsteps of its predecessors, to serve as a great platform for researchers to discuss and explore advanced technologies of optoelectronics and communications from device to system levels in the following topics:

(1) Core/access networks and switching systems;

(2) Transmission systems and subsystems;

(3) Optical fibers, cables, devices, and modules;

(4) Optical active devices and modules;

(5) Optical passive devices and modules;

(6) Integrated photonics and nanophotonics;

(7) Biomedical and optical sensing;

(8) Machine Learning/AI, quantum communication/computing, and others.

It will cover a wide range of fields in science and engineering innovation and aims to bring together engineering technology expertise. Professionals from industry, academia, and government in discourse on research and development and professional practice, business, and management in the science and engineering fields are welcome to attend the event.

OECC2020 consists of the 8 categories and more than 40 regular and special sessions (http://oecc2020.ntust.edu.tw/index.php).

The main goal of this Special Issue, “Selected Papers from OECC 2020”, is to present the latest advances in research and novel applications of engineering and technology, especially a wide variety of sensor technologies from sensor devices and systems, to their applications. Potential topics include but are not limited to:

  • Sensor networks
  • Sensor systems
  • Sensor data transmission
  • Sensor materials
  • Sensor devices
  • Optical sensors
  • Sensor modules
  • Sensor integration
  • Biomedical sensing
  • Sensor data analysis
  • Sensor applications

Prof. Dr. Kimio Oguchi
Prof. Dr. Sheng-Lung Huang
Prof. Dr. Shien-Kuei Liaw
Prof. Dr. Pinghui Sophia Yeh
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Sensors is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Published Papers (5 papers)

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Research

9 pages, 3166 KiB  
Communication
Photonic Crystal Polymeric Thin-Film Dye-Lasers for Attachable Strain Sensors
by Tsan-Wen Lu, Yu-Kai Feng, Huan-Yeuh Chu and Po-Tsung Lee
Sensors 2021, 21(16), 5331; https://doi.org/10.3390/s21165331 (registering DOI) - 6 Aug 2021
Viewed by 2243
Abstract
In this report, using two-dimensional photonic crystals (PhC) and a one-dimensional PhC nano-beam cavity, we realized the development of all-polymeric dye-lasers on a dye-doped, suspended poly-methylmethacrylate film with a wavelength-scale thickness. In addition to the characterization of basic lasing properties, we also evaluated [...] Read more.
In this report, using two-dimensional photonic crystals (PhC) and a one-dimensional PhC nano-beam cavity, we realized the development of all-polymeric dye-lasers on a dye-doped, suspended poly-methylmethacrylate film with a wavelength-scale thickness. In addition to the characterization of basic lasing properties, we also evaluated its capacity to serve as an attachable strain sensor. Through experimentation, we confirmed the stable lasing performances of the dye-laser attaching on a rough surface. Moreover, we also theoretically studied the wavelength responses of the utilized PhC resonators to stretching strain and further improved them via the concept of strain shaping. The attachability and high strain sensing response of the presented thin film PhC dye-lasers demonstrate their potential as attachable strain sensors. Full article
(This article belongs to the Special Issue Selected Papers from the 25th Optoelectronics and Communications Conference (OECC2020))
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11 pages, 3030 KiB  
Communication
Constant Optical Power Operation of an Ultraviolet LED Controlled by a Smartphone
by Ching-Hua Chen, Jia-Jun Zhang, Chang-Han Wang, Yu-Chia Chang and Pinghui S. Yeh
Sensors 2021, 21(14), 4707; https://doi.org/10.3390/s21144707 - 9 Jul 2021
Cited by 5 | Viewed by 2167
Abstract
Constant light power operation of an ultraviolet (UV) LED based on portable low-cost instrumentation and a monolithically integrated monitoring photodiode (MPD) has been reported for the first time. UV light irradiation has become one of the essential measures for disinfection and sterilization. Monitoring [...] Read more.
Constant light power operation of an ultraviolet (UV) LED based on portable low-cost instrumentation and a monolithically integrated monitoring photodiode (MPD) has been reported for the first time. UV light irradiation has become one of the essential measures for disinfection and sterilization. Monitoring and maintaining a specified light power level is important to meet the criteria of sterilization. We built a module composed of a monolithically integrated UV LED and MPD, a transimpedance amplifier, an Arduino Uno card, a digital-to-analog converter and a Bluetooth transceiver. An Android App that we wrote remotely controlled the UV LED module via Bluetooth. The Arduino Uno card was programmed to receive demands from the smartphone, sent a driving voltage to the LED and returned the present MPD voltage to the smartphone. A feedback loop was used to adjust the LED voltage for maintaining a constant light output. We successfully demonstrated the functioning of remote control of the App, and the resultant UV LED measured power remained the same as the setting power. This setup can also be applied to visible or white LEDs for controlling/maintaining mixed light’s chromaticity coordinates or color temperature. With such controlling and internet capability, custom profiling and maintenance of precision lighting remotely would be possible. Full article
(This article belongs to the Special Issue Selected Papers from the 25th Optoelectronics and Communications Conference (OECC2020))
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10 pages, 1993 KiB  
Communication
Hybrid Fiber-Optic Sensing Integrating Brillouin Optical Time-Domain Analysis and Fiber Bragg Grating for Long-Range Two-Parameter Measurement
by Shien-Kuei Liaw, Chi-Wen Liao, Meng-Hsuan Tsai, Dong-Chang Li, Shu-Ming Yang, Zhu-Yong Xia, Chien-Hung Yeh and Wen-Fung Liu
Sensors 2021, 21(12), 4224; https://doi.org/10.3390/s21124224 - 20 Jun 2021
Cited by 4 | Viewed by 2441
Abstract
Distributed fiber sensing (DFS) can provide real-time signals and warnings. The entire length of fiber optic cable can act as a sensing element, but the accuracy is sometimes limited. On the other hand, point-to-point fiber sensing (PPFS) is usually implemented using one or [...] Read more.
Distributed fiber sensing (DFS) can provide real-time signals and warnings. The entire length of fiber optic cable can act as a sensing element, but the accuracy is sometimes limited. On the other hand, point-to-point fiber sensing (PPFS) is usually implemented using one or more fiber Bragg gratings (FBGs) at specific positions along with the fiber for the monitoring of specific parameters (temperature, strain, pressure, and so on). However, the cost becomes expensive when the number of FBGs increases. A hybrid fiber sensing scheme is thus proposed, combining the advantages of DFS and PPFS. It is based on a Brillouin optical time-domain analysis (BOTDA) fiber system with additional FBGs embedded at certain positions where it is necessary to detect specific parameters. The hybrid fiber sensing system has the advantages of full sensing coverage at essential locations that need to be carefully monitored. In our work, the test results showed that the proposed system could achieve a sensing distance of 16 km with the single-mode fiber with a 2 m spatial resolution. For FBG parameter measurements, the temperature variation was 52 °C, from 25 °C to 77 °C, with a temperature sensitivity of 23 pm/°C, and the strain was from 0 to 400 µε, with a strain sensitivity of 0.975 pm/µε, respectively, using two FBGs. Full article
(This article belongs to the Special Issue Selected Papers from the 25th Optoelectronics and Communications Conference (OECC2020))
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9 pages, 1609 KiB  
Communication
Loss-Modulation-Based Wavelength-Range Shifting of Tunable EDF Ring Laser with Cascaded-Chirped Long-Period Fiber Grating for Temperature Measurement
by Koken Fukushima, Manuel Guterres Soares, Atsushi Wada, Satoshi Tanaka and Fumihiko Ito
Sensors 2021, 21(7), 2342; https://doi.org/10.3390/s21072342 - 27 Mar 2021
Cited by 7 | Viewed by 2444
Abstract
A novel tunable Erbium-doped fiber ring laser (EDFRL) with a cascaded-chirped long-period fiber grating (C-CLPG) as a wavelength selection filter is proposed from the viewpoint of the sensor use, in which a variable optical attenuator (VOA) is employed as an intracavity loss modulator [...] Read more.
A novel tunable Erbium-doped fiber ring laser (EDFRL) with a cascaded-chirped long-period fiber grating (C-CLPG) as a wavelength selection filter is proposed from the viewpoint of the sensor use, in which a variable optical attenuator (VOA) is employed as an intracavity loss modulator to change the oscillation wavelength region so that the resultant tuning wavelength range is widened. In the demonstrative experiment for temperature measurements, oscillation over the wavelength range of 12.85 nm (1557.62~1570.47 nm), which is more than three times range of the previously presented laser and is equivalent to 64 °C in terms of temperature change, was achieved, while a single-wavelength oscillation was maintained. In addition, a practical technique for realizing a temperature measurement by combining with the VOA control is also discussed. Full article
(This article belongs to the Special Issue Selected Papers from the 25th Optoelectronics and Communications Conference (OECC2020))
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16 pages, 6183 KiB  
Article
Accurate Peak Detection for Optical Sensing with Reduced Sampling Rate and Calculation Complexity
by Jiun-Yu Sung, Jin-Kai Chen, Shien-Kuei Liaw and Hiroki Kishikawa
Sensors 2021, 21(7), 2306; https://doi.org/10.3390/s21072306 - 25 Mar 2021
Cited by 1 | Viewed by 2320
Abstract
Fiber Bragg gratings (FBGs) are widely applied in optical sensing systems due to their advantages including being simple to use, high sensitivity, and having great potential for integration into optical communication systems. A common method used for FBG sensing systems is wavelength interrogation. [...] Read more.
Fiber Bragg gratings (FBGs) are widely applied in optical sensing systems due to their advantages including being simple to use, high sensitivity, and having great potential for integration into optical communication systems. A common method used for FBG sensing systems is wavelength interrogation. The performance of interrogation based sensing systems is significantly determined by the accuracy of the wavelength peak detection processing. Direct maximum value readout (DMVR) is the simplest peak detection method. However, the detection accuracy of DMVR is sensitive to noise and the sampling resolution. Many modified peak detection methods, such as filtering and curve fitting schemes, have been studied in recent decades. Though these methods are less sensitive to noise and have better sensing accuracy at lower sampling resolutions, they also confer increased processing complexity. As massive sensors may be deployed for applications such as the Internet of things (IoT) and artificial intelligence (AI), lower levels of processing complexity are required. In this paper, an efficient scheme applying a three-point peak detection estimator is proposed and studied, which shows a performance that is close to the curve fitting methods along with reduced complexity. A proof-of-concept experiment for temperature sensing is performed. 34% accuracy improvement compared to the DMVR is demonstrated. Full article
(This article belongs to the Special Issue Selected Papers from the 25th Optoelectronics and Communications Conference (OECC2020))
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