Widely tunable wavelength spacing dual-wavelength single longitudinal mode erbium doped fiber laser |
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| Affiliation: | 1. College of Communication Engineering, Jilin University, 5372 Nanhu Road, Changchun 130012, China;2. Institute of Space Photoelectric Technology, Changchun University of Science and Technology, 7186 Weixing Road, Changchun 130022, China;1. Physics Department, Islamic Azad University, Kerman Branch, Kerman, Iran;2. Center for Research and Postgraduate, National Defence University, 57000 Kuala Lumpur, Malaysia;3. Optoelectronics Research Group, School of Engineering, University of Glasgow, Glasgow, Scotland, UK;4. Photonics Research Centre, University of Malaya, 50603 Kuala Lumpur, Malaysia;1. CSIR-Structural Engineering Research Centre, Chennai, India;2. College of Engineering Campus, Chennai, India |
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| Abstract: | A simple widely tunable wavelength spacing dual-wavelength single longitudinal mode (SLM) erbium doped fiber laser (EDFL) based on cascaded fiber Bragg gratings (FBGs) and birefringent fiber filter is proposed and demonstrated. Experimental results show that the lasing wavelength spacing is widely tunable in a range from 2 nm to 18 nm, which has potential to generate frequency tunable terahertz (THz) waves by beating the lasing dual-wavelength in a high speed photodetector. The birefringent fiber filter acts as an ultra-narrow bandpass filter and benefits the simultaneous oscillation of dual-wavelength in a single laser cavity. The output peak power of the lasing dual-wavelength is approximately equalized at room temperature, and a high optical signal-to-noise ratio (OSNR) is realized in the whole tuning range. The SLM operation of dual-wavelength fiber laser is verified by Fabry–Perot (F–P) scanning interferometer, and the clear eye diagram proves that the proposed fiber laser is effective in the application of fiber optic communication system. |
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| Keywords: | Dual-wavelength fiber laser Single longitudinal mode Erbium doped fiber laser Birefringent fiber filter |
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