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All Journal International Journal of Electrical and Computer Engineering Bulletin of Electrical Engineering and Informatics Jurnal Ilmiah Teknik Elektro Komputer dan Informatika (JITEKI) Jurnal Penelitian Pendidikan IPA (JPPIPA) Makara Journal of Technology International Journal of Electrical, Computer, and Biomedical Engineering (IJECBE)
Retno Wigajatri Purnamaningsih
Universitas Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Education Electrical & Electronics Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Physics

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Design of a 1x4 Optical Power Divider Based on Y-Branch Using III-Nitride Semiconductor Nauval Franata; Retno Wigajatri Purnamaningsih
Jurnal Ilmiah Teknik Elektro Komputer dan Informatika Vol. 8 No. 1 (2022): March
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/jiteki.v8i1.23646

Abstract

Optical communications are identified as a technology that is able to meet future demands. As a passive component of optical communication, optical power dividers play an essential role. We propose a novel 1x4 optical power divider design, which is a combination of an optical power divider design using a Y-branch and an optical power divider using rectangular waveguides utilizing mode coupling phenomena from our previous researched designs. The 1x4 optical power divider design using three Y-branches and utilizing mode coupling phenomena is described in this work. The design consists of three sections: an input Y-branch, rectangular waveguides, and two output Y-branches. By utilizing mode coupling phenomena with 3 rectangular waveguides, the optical power was transferred from one waveguide to its adjacent, so we obtained a wider splitting angle at the input Y-branch. The design was optimized using the beam propagation method (BPM) at a wavelength for optical communication of λ = 1.55 µm. We optimized various parameters such as the width and thickness of the waveguide, splitting angles, coupling gaps, and coupling lengths by doing numerous experiments. The result shows that the proposed design was successfully split into four outputs with 0.14 dB power imbalance at four output ports and 0.12 dB excess loss through the design. The excess loss and power imbalance at varied wavelengths were also observed. The distribution of excess loss and power imbalance is almost stable through the C-band range (1530-1565 nm). The proposed design shows the possibility of a new wide-angle optical power divider design and demonstrates the development possibilities of optical interconnections at wavelengths of 1530-1565 nm.
Experimental Characterization of a Tri-Axial FBG Accelerometer for Underwater Thruster-Induced Vibration Detection Muhammad Alif Rahman Sukapraja; Retno Wigajatri Purnamaningsih; Sasono Rahardjo; Maristya Rahmadiansyah; Tinova Pramudya
International Journal of Electrical, Computer, and Biomedical Engineering Vol. 4 No. 1 (2026)
Publisher : Universitas Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62146/ijecbe.v4i1.226

Abstract

This paper presents an experimental engineering validation of a tri-axial Fiber Bragg Grating (FBG) accelerometer for detecting thruster-induced vibrations in submerged environments. The sensor integrates three orthogonally arranged FBG elements within a compact, waterproof housing, enabling vibration measurements along three spatial directions. Experiments were conducted using a DC thruster as a repeatable vibration source under both free-air and underwater conditions. Comparative results show a marked increase in Bragg wavelength shift (ΔλB) when submerged, with peak-to-peak variations reaching approximately 0.0267 nm on non-primary axes and up to 0.1005 nm on the axis aligned with the excitation, compared to approximately 0.0044 nm in free air. Sensor sensitivity, repeatability, and hysteresis were evaluated through cyclic loading-unloading tests. The maximum hysteresis observed was 0.0053 nm, corresponding to approximately 5% of the full-scale wavelength shift, indicating stable and predominantly elastic behavior.
Co-Authors Andrianto Handojo Anwar, Rudi Choirul Dimitris Pavlidis, Dimitris Dini Andiani Dini Andiani, Dini Dini Marhaeni Elecevani Dwi Hanto Elhadj Dogeche, Elhadj Elhadj Dogheche Elhadj Dogheche Firdaus, Muhammad Yusha Franata, Nauval Hamidah, Maratul Hapiddin, Asep Hendrik Kurniawan Hutagalung, Febrian Winston Irma Saraswati Junivan Sulistianto Luh Putu Ratna Sundari Maristya Rahmadiansyah Martha, Aryandi Mefina Yulias Rofianingrum Muhammad Alif Rahman Sukapraja Nainggolan, Sahat Pandapotan NB Prihantini Nibras Yayienda Nji Raden Poespawati Nyi Raden Poespawati Nyi Raden Poespawati, Nyi Pramudya, Tinova Prihantini, Nining Betawati Rizqy Pratama Rahman Sasono Rahardjo Sasono Rahardjo, Sasono Setyawan, Rahmatul Yoga Tinova Pramudya Tomy Abuzairi