scholarly journals Multiwavelength Fiber Laser based on Bidirectional Lyot Filter in Conjunction with Intensity Dependent Loss Mechanism

2018 ◽  
Vol 10 (3) ◽  
pp. 840 ◽  
Author(s):  
A. H. Sulaiman ◽  
N. Md. Yusoff ◽  
N. A. Cholan ◽  
M. A. Mahdi
Keyword(s):  
Fiber Laser ◽  
Extinction Ratio ◽  
Polarization State ◽  
Optical Amplifier ◽  
Gain Medium ◽  
Loss Mechanism ◽  
Beam Combiner ◽  
Multiwavelength Fiber Laser ◽  
Lyot Filter ◽  
Polarization Maintaining Fiber

<span>We experimentally demonstrate a multiwavelength fiber laser (MWFL) based on bidirectional Lyot filter. A semiconductor optical amplifier (SOA) is used as the gain medium, while its combination with polarization controllers (PCs) and polarization beam combiner (PBC) induces intensity dependent loss (IDL) mechanism. The IDL mechanism acts as an intensity equalizer to flatten the multiwavelength spectrum, which can be obtained at a certain polarization state. Using different ratio of optical splitter has affected to multiwavelength flatness degradation. Subsequently, when we removed a polarizer in the setup, the extinction ratio (ER) is decreased. Ultimately, with two segments of polarization maintaining fiber (PMF), two channel spacings can be achieved due to splicing shift of 0° and 90°.</span>

scholarly journals Nonlinearity Effect on Multiwavelength fiber laser based on Sagnac loop mirror interferometer

2021 ◽  
Author(s):  
Abdul Hadi Sulaiman ◽  
Nur Maizatul Nadia Najamhuri ◽  
Muhd Amirul Hafizi Sukor ◽  
Aiman Ismail ◽  
Fairuz Abdullah ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Extinction Ratio ◽  
Laser Cavity ◽  
Fiber Amplifier ◽  
Observation Time ◽  
Lasing Spectrum ◽  
Loss Mechanism ◽  
Highly Nonlinear ◽  
Multiwavelength Fiber Laser ◽  
Loop Mirror

This paper demonstrates a multiwavelength fiber laser (MWFL) with erbiumdoped fiber amplifier (EDFA) as gain  medium and Sagnac loop mirror interferometer as filter. Stable and flat lasing spectrum was achieved when highly  nonlinear fiber (HNLF) was inserted into the laser cavity. The number of lasing lines and extinction ratio (ER) was directly influenced by EDFA gain where at maximum setting, 14 lasing lines with ER of 19 dB were generated. The  stable and flat spectrum achieved spanned about 1.6 nm. This is due to the induced intensity dependent loss  mechanism in the cavity by adjusting the half-wave plate of the polarization controller in combination with the  HNLF. The MWFL output showed peak power variation of about 2.1 dB within 100 minutes of observation time.

scholarly journals Double loop mirror multi-wavelengths Brillouin fiber laser utilizing semiconductor optical amplifier based on SMF as gain medium

2018 ◽  
Author(s):  
S. N. C. A. Jalil ◽  
N. A. M. A. Hambali ◽  
M. H. A. Wahid ◽  
A. Z. Malek ◽  
M. M. Shahimin ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Semiconductor Optical Amplifier ◽  
Optical Amplifier ◽  
Gain Medium ◽  
Double Loop ◽  
Loop Mirror

scholarly journals Lyot-based Multi-wavelength Fiber Laser

2017 ◽  
Vol 7 (2) ◽  
pp. 981 ◽  
Author(s):  
Suhairie Saleh ◽  
N. A. Cholan ◽  
A. H. Sulaiman ◽  
M. A. Mahdi
Keyword(s):  
Fiber Laser ◽  
Extinction Ratio ◽  
Laser Cavity ◽  
Four Wave Mixing ◽  
Wave Mixing ◽  
Highly Nonlinear Fiber ◽  
Highly Nonlinear ◽  
Lyot Filter ◽  
Multi Wavelength ◽  
Filter Mechanism

A multi-wavelength fiber laser which is based on a Lyot filter is experimentally demonstrated. A combination of four-wave mixing in a highly nonlinear fiber and Lyot filter mechanism in the laser cavity is able to generate multi-wavelength with relatively high extinction ratio (ER). At the input current of 100mA, six laser lines with ER more than 5 dB are successfully generated. The wavelength spacing for the multi-wavelength is 0.15nm, corresponding to the characteristics of the Lyot filter used.

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