Frequency switching multiwavelength Brillouin Raman fibre laser based on feedback power adjustment technique

A simple switchable multiwavelength Brillouin-Raman fibre laser (BRFL) was demonstrated. The laser was arranged in a half-open cavity configuration including a physical mirror device with an adjustable reflectivity at one side of the laser cavity. The impact of the feedback power adjustment on frequ...

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Bibliographic Details
Published in:Journal of modern optics 2020-06, Vol.67 (11), p.951-957
Main Authors: Ahmad, Harith, Al-Alimi, Abdulmoghni Wazae, Kadir, Muhammad Zamzuri bin Abdul, Bayang, Leonard, Ismail, Mohammad Faizal, Thambiratnam, Kavintheran
Format: Article
Language:English
Subjects:
Feedback
Fiber laser
Fiber lasers
Laser applications
Lasers
multi-wavelength Brillouin-Raman fibre laser
Noise levels
Optical communication
Raman amplifier
Raman lasers
Reflectance
reflectivity
Reflector
Signal to noise ratio
Switching
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Summary:A simple switchable multiwavelength Brillouin-Raman fibre laser (BRFL) was demonstrated. The laser was arranged in a half-open cavity configuration including a physical mirror device with an adjustable reflectivity at one side of the laser cavity. The impact of the feedback power adjustment on frequency switching was carried out by comparing the peak power difference between odd- and even-order Stokes lines. Up to 468 flat-amplitude lines with a 10 GHz frequency spacing and average optical signal to noise ratio (OSNR) of 33 dB were observed with mirror reflectivity values of ∼15% up to 60% at a 1534 nm Brillouin pump power of 7 dBm and 0.9 W Raman pump power of 0.9 W. - Under the same pumping conditions, setting the mirror reflectivity at its OFF state (where reflectivity is nearly 0%) allows for up to 242 lines with 20 GHz spacing to be realized, with ONSR values of ∼35 dB.
ISSN:0950-0340
1362-3044
DOI:10.1080/09500340.2020.1792567