Enhanced flatness of 20 Ghz channel spacing multiwavelength Brillouin-Raman fiber laser with sub-millimeter air gap
We discover the technique of controlling the flatness in signal amplitude of a multiwavelength Brillouin-Raman fiber laser by employing an air-gap outside of the cavity. The structure that is adjustable within sub-millimeter length behaves as flexible optical feedback that provides modifiable portio...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Optical Society of America
2018
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| Online Access: | http://psasir.upm.edu.my/id/eprint/72573/1/Enhanced%20flatness%20of%2020%20Ghz%20.pdf |
| _version_ | 1825950109441982464 |
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| author | Al-Alimi, A. W. Sarmani, Abdul Rahman Al-Mansoori, Mohammed Hayder Abas, Ahmad Fauzi Alresheedi, Mohammed Thamer Mahdi, Mohd Adzir |
| author_facet | Al-Alimi, A. W. Sarmani, Abdul Rahman Al-Mansoori, Mohammed Hayder Abas, Ahmad Fauzi Alresheedi, Mohammed Thamer Mahdi, Mohd Adzir |
| author_sort | Al-Alimi, A. W. |
| collection | UPM |
| description | We discover the technique of controlling the flatness in signal amplitude of a multiwavelength Brillouin-Raman fiber laser by employing an air-gap outside of the cavity. The structure that is adjustable within sub-millimeter length behaves as flexible optical feedback that provides modifiable portions of multiple Fresnel reflectivities. This is the main benchmark that allows the efficient management of gain competition between self-lasing modes and Brillouin Stokes waves that is vital for self-flattening initiation. When setting the Brillouin pump wavelength at 1529 nm and the air-gap distance to 0.4 mm, 296 Stokes lines are produced with a channel spacing of 0.158 nm. The lasing bandwidth is 46.60 nm that covers from 1529.16 to 1575.76 nm wavelength. In this case at Raman power of 950 mW, the intense Brillouin pump power of 2 dBm saturates the cascaded higher-orders lasing lines. As a result, the overall peak power discrepancy is maintained at just 1.8 dB where an average optical-signal-to-noise ratio of 20 dB is realized. To date, this is the widest bandwidth with the flattest spectrum attained in multiwavelength fiber lasers that incorporate a single Raman pump unit. |
| first_indexed | 2024-03-06T10:09:35Z |
| format | Article |
| id | upm.eprints-72573 |
| institution | Universiti Putra Malaysia |
| language | English |
| last_indexed | 2024-03-06T10:09:35Z |
| publishDate | 2018 |
| publisher | Optical Society of America |
| record_format | dspace |
| spelling | upm.eprints-725732020-11-03T03:38:44Z http://psasir.upm.edu.my/id/eprint/72573/ Enhanced flatness of 20 Ghz channel spacing multiwavelength Brillouin-Raman fiber laser with sub-millimeter air gap Al-Alimi, A. W. Sarmani, Abdul Rahman Al-Mansoori, Mohammed Hayder Abas, Ahmad Fauzi Alresheedi, Mohammed Thamer Mahdi, Mohd Adzir We discover the technique of controlling the flatness in signal amplitude of a multiwavelength Brillouin-Raman fiber laser by employing an air-gap outside of the cavity. The structure that is adjustable within sub-millimeter length behaves as flexible optical feedback that provides modifiable portions of multiple Fresnel reflectivities. This is the main benchmark that allows the efficient management of gain competition between self-lasing modes and Brillouin Stokes waves that is vital for self-flattening initiation. When setting the Brillouin pump wavelength at 1529 nm and the air-gap distance to 0.4 mm, 296 Stokes lines are produced with a channel spacing of 0.158 nm. The lasing bandwidth is 46.60 nm that covers from 1529.16 to 1575.76 nm wavelength. In this case at Raman power of 950 mW, the intense Brillouin pump power of 2 dBm saturates the cascaded higher-orders lasing lines. As a result, the overall peak power discrepancy is maintained at just 1.8 dB where an average optical-signal-to-noise ratio of 20 dB is realized. To date, this is the widest bandwidth with the flattest spectrum attained in multiwavelength fiber lasers that incorporate a single Raman pump unit. Optical Society of America 2018 Article PeerReviewed text en http://psasir.upm.edu.my/id/eprint/72573/1/Enhanced%20flatness%20of%2020%20Ghz%20.pdf Al-Alimi, A. W. and Sarmani, Abdul Rahman and Al-Mansoori, Mohammed Hayder and Abas, Ahmad Fauzi and Alresheedi, Mohammed Thamer and Mahdi, Mohd Adzir (2018) Enhanced flatness of 20 Ghz channel spacing multiwavelength Brillouin-Raman fiber laser with sub-millimeter air gap. Optics Express, 26 (23). 30978 - 30990. ISSN 1094-4087 https://www.osapublishing.org/oe/fulltext.cfm?uri=oe-26-23-30978&id=401148 10.1364/OE.26.030978 |
| spellingShingle | Al-Alimi, A. W. Sarmani, Abdul Rahman Al-Mansoori, Mohammed Hayder Abas, Ahmad Fauzi Alresheedi, Mohammed Thamer Mahdi, Mohd Adzir Enhanced flatness of 20 Ghz channel spacing multiwavelength Brillouin-Raman fiber laser with sub-millimeter air gap |
| title | Enhanced flatness of 20 Ghz channel spacing multiwavelength Brillouin-Raman fiber laser with sub-millimeter air gap |
| title_full | Enhanced flatness of 20 Ghz channel spacing multiwavelength Brillouin-Raman fiber laser with sub-millimeter air gap |
| title_fullStr | Enhanced flatness of 20 Ghz channel spacing multiwavelength Brillouin-Raman fiber laser with sub-millimeter air gap |
| title_full_unstemmed | Enhanced flatness of 20 Ghz channel spacing multiwavelength Brillouin-Raman fiber laser with sub-millimeter air gap |
| title_short | Enhanced flatness of 20 Ghz channel spacing multiwavelength Brillouin-Raman fiber laser with sub-millimeter air gap |
| title_sort | enhanced flatness of 20 ghz channel spacing multiwavelength brillouin raman fiber laser with sub millimeter air gap |
| url | http://psasir.upm.edu.my/id/eprint/72573/1/Enhanced%20flatness%20of%2020%20Ghz%20.pdf |
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