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Lang J, Lv C, Lu B, Bai J. Mechanism of noise-like pulse in all-normal dispersion all-fiber laser based on nonlinear polarization rotation. OPTICS EXPRESS 2024; 32:2392-2404. [PMID: 38297770 DOI: 10.1364/oe.508074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2023] [Accepted: 12/26/2023] [Indexed: 02/02/2024]
Abstract
We investigate the mechanism of changing the polarization state to generate noise-like pulses (NLPs) in the all-normal dispersion (ANDi) all-fiber laser based on nonlinear polarization rotation (NPR). Numerical simulations show that the intracavity positive and negative feedback states change with the polarization state, the peak power of the pulse will be clamped when the negative feedback comes into play, thus facilitating the transition from dissipative soliton (DS) to NLP. Experimentally, the observation of wavelength switching and transition between DS and NLP by simply adjusting the polarization state matches the numerical simulation results. This study contributes to a deeper understanding of the mechanism for generating NLP by changing the intracavity polarization state in ANDi all-fiber lasers based on NPR and offers new possibilities for pulse-switchable light sources.
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Sloyan K, Melkonyan H, Apostoleris H, Dahlem MS, Chiesa M, Al Ghaferi A. A review of focused ion beam applications in optical fibers. NANOTECHNOLOGY 2021; 32:472004. [PMID: 34388743 DOI: 10.1088/1361-6528/ac1d75] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2021] [Accepted: 08/12/2021] [Indexed: 06/13/2023]
Abstract
Focused ion beam (FIB) technology has become a promising technique in micro- and nano-prototyping due to several advantages over its counterparts such as direct (maskless) processing, sub-10 nm feature size, and high reproducibility. Moreover, FIB machining can be effectively implemented on both conventional planar substrates and unconventional curved surfaces such as optical fibers, which are popular as an effective medium for telecommunications. Optical fibers have also been widely used as intrinsically light-coupled substrates to create a wide variety of compact fiber-optic devices by FIB milling diverse micro- and nanostructures onto the fiber surface (endfacet or outer cladding). In this paper, the broad applications of the FIB technology in optical fibers are reviewed. After an introduction to the technology, incorporating the FIB system and its basic operating modes, a brief overview of the lab-on-fiber technology is presented. Furthermore, the typical and most recent applications of the FIB machining in optical fibers for various applications are summarized. Finally, the reviewed work is concluded by suggesting the possible future directions for improving the micro- and nanomachining capabilities of the FIB technology in optical fibers.
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Affiliation(s)
- Karen Sloyan
- Department of Mechanical and Materials Engineering, Khalifa University, SAN Campus, Abu Dhabi 127788, United Arab Emirates
- Laboratory for Energy and Nano Science (LENS), Khalifa University, SAN Campus, Abu Dhabi 127788, United Arab Emirates
| | - Henrik Melkonyan
- Department of Physics, Yerevan State University, Yerevan 0025, Armenia
| | - Harry Apostoleris
- Department of Mechanical and Materials Engineering, Khalifa University, SAN Campus, Abu Dhabi 127788, United Arab Emirates
- Laboratory for Energy and Nano Science (LENS), Khalifa University, SAN Campus, Abu Dhabi 127788, United Arab Emirates
| | - Marcus S Dahlem
- Interuniversity Microelectronics Center (IMEC), Leuven B-3001, Belgium
| | - Matteo Chiesa
- Department of Mechanical and Materials Engineering, Khalifa University, SAN Campus, Abu Dhabi 127788, United Arab Emirates
- Laboratory for Energy and Nano Science (LENS), Khalifa University, SAN Campus, Abu Dhabi 127788, United Arab Emirates
- Department of Physics and Technology, UiT The Arctic University of Norway, Tromsø 9010, Norway
| | - Amal Al Ghaferi
- Department of Mechanical and Materials Engineering, Khalifa University, SAN Campus, Abu Dhabi 127788, United Arab Emirates
- Laboratory for Energy and Nano Science (LENS), Khalifa University, SAN Campus, Abu Dhabi 127788, United Arab Emirates
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Rosenthal A, Horowitz M. Reconstruction of long-period fiber gratings from their core-to-core transmission function. JOURNAL OF THE OPTICAL SOCIETY OF AMERICA. A, OPTICS, IMAGE SCIENCE, AND VISION 2006; 23:57-68. [PMID: 16478060 DOI: 10.1364/josaa.23.000057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
In order to reconstruct the structure of a long-period grating, both the complex core-to-core transmission function and the complex core-to-cladding transmission function should be known. However, in practice, only the core-to-core transmission function of the grating can be measured. We demonstrate theoretically the reconstruction of long-period gratings from only the core-to-core transmission function. The reconstruction is performed by extracting the complex core-to-cladding transmission function of the grating from its core-to-core transmission function. Generally, the extraction is not unique; however, we show that by writing an additional grating in cascade to the interrogated grating, a unique reconstruction can be obtained. In weak long-period gratings, only the amplitude of the core-to-core transmission function is needed to reconstruct the grating. The results of our work can enable the experimental reconstruction of long-period gratings from their transmission function as well as the development of novel distributed sensors.
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Affiliation(s)
- Amir Rosenthal
- Department of Electrical Engineering, Technion-Israel Institute of Technology, Haifa 32000, Israel.
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Rosenthal A, Horowitz M, Lange S, Shäffer C. Experimental reconstruction of a long-period grating from its core-to-core transmission spectrum. OPTICS LETTERS 2005; 30:3272-4. [PMID: 16389802 DOI: 10.1364/ol.30.003272] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
We demonstrate, for the first time to our knowledge, reconstruction of the structure of a long-period grating from its measured core-to-core transmission spectrum intensity. The reconstruction is obtained by writing an auxiliary grating in cascade to the interrogated grating. Our reconstruction technique is based on using the Hilbert transform and a phase-retrieval algorithm. Using our method, we have reconstructed the structure of a uniform long-period grating with a 47% coupling efficiency.
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Affiliation(s)
- Amir Rosenthal
- Department of Electrical Engineering, Technion-Israel Institute of Technology, Haifa 32000, Israel.
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Rosenthal A, Horowitz M. Inverse scattering algorithm for reconstructing lossy fiber Bragg gratings. JOURNAL OF THE OPTICAL SOCIETY OF AMERICA. A, OPTICS, IMAGE SCIENCE, AND VISION 2004; 21:552-560. [PMID: 15078027 DOI: 10.1364/josaa.21.000552] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
We demonstrate an inverse scattering algorithm for reconstructing the structure of lossy fiber Bragg gratings. The algorithm enables us to extract the profiles of the refractive index and the loss coefficient along the grating from the grating transmission spectrum and from the reflection spectra, measured from both sides of the grating. Such an algorithm can be used to develop novel distributed evanescent-wave fiber Bragg sensors that measure the change in both the refractive index and the attenuation coefficient of the medium surrounding the grating. The algorithm can also be used to analyze and to design fiber Bragg gratings written in fiber amplifiers. A novel method to overcome instability problems in extracting the parameters of the lossy grating is introduced. The new method also makes it possible to reduce the spectral resolution needed to accurately extract the grating parameters.
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Affiliation(s)
- Amir Rosenthal
- Department of Electrical Engineering, Technion-Israel Institute of Technology, Haifa 32000 Israel.
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