The Experts below are selected from a list of 10941 Experts worldwide ranked by ideXlab platform
M H Almansoori - One of the best experts on this subject based on the ideXlab platform.
-
tunable multiwavelength l band brillouin Erbium Fiber laser utilizing passive edf absorber section
Optical Fiber Technology, 2013Co-Authors: T F Almashhadani, M H Almansoori, M Z Jamaludin, F Abdullah, A K Abass, N I M RawiAbstract:We demonstrate a simple tunable L-band multiwavelength Brillouin-Erbium Fiber laser that utilizes a short passive Erbium doped Fiber (PEDF) as an absorber section. The impact of including the PEDF absorber section on the laser tunability is investigated. The proposed laser structure exhibits a wide tuning range of 24.4 nm (from 1583.5 nm to 1607.9 nm) at 1480 nm pump and Brillouin pump powers of 100 and 4 mW, respectively. This tuning range represents a 31% increase compared with a laser without a PEDF absorber section. The average number of stable output channels produced within this wavelength range is 16 channels with a spacing of 0.089 nm.
-
realization of a low threshold multiwavelength brillouin Erbium f iber laser by optimizing the reflected power
Chinese Optics Letters, 2012Co-Authors: A W Alalimi, M H Almansoori, A F Abas, M A Mahdi, M MokhtarAbstract:A multiwavelength Brillouin/Erbium Fiber laser (BEFL) with low threshold power is realized. A low threshold power of 3 mW and a wide tuning range of 18 nm can be achieved by controlling the reflected power in the nonlinear optical loop mirror (NOLM). Up to 24 lines with a wavelength spacing of 0.086 nm are generated at the Brillouin pump and at the 1 480-nm pump with ?0.5 dBm (0.9 mW) and 25 mW of power, respectively.
-
optimization of brillouin pump wavelength location on tunable multiwavelength befl
Laser Physics, 2009Co-Authors: Abd Z Rahman, M H Almansoori, S Hitam, A F Abas, M Abu H Bakar, Mohd Adzir MahdiAbstract:Optimization of Brillouin pump (BP) wavelength location on tunable multiwavelength Brillouin-Erbium Fiber laser (BEFL) with BP pre-amplified technique is experimentally investigated. The tunable multiwavelength BEFL is achieved by utilization a tunable band-pass filter in a laser cavity. The optimum BP power and BP wavelength location within the filter bandwidth is determined in order to obtain the maximum stable output channels. Optimum distance of launching the BP wavelength is found at 0.80 nm shorter from the center wavelength of the filter bandwidth. 15 stable output channels are achieved from the tunable Fiber laser system within the optimum range of BP power which is found to be between 5.2 to 5.7 dBm.
-
seamless tuning range based on available gain bandwidth in multiwavelength brillouin Fiber laser
Optics Express, 2009Co-Authors: M Ajiya, M H Almansoori, S Hitam, M A Mahdi, M MokhtarAbstract:We experimentally demonstrate a simple widely tunable multiwavelength Brillouin/Erbium Fiber laser that can be tuned over the entire C-band, thereby greatly improving the tuning range limitation faced by the previous Brillouin-Erbium Fiber laser architectures. Tuning range of 39 nm from 1527 nm to 1566 nm, which is only limited by the amplification bandwidth of the Erbium gain was successfully achieved. At Brillouin pump wavelength of 1550 nm and 1480 nm laser pump and Brillouin pump powers of 130 mW and 2 mW respectively, all the generated output channels have peak power above 0 dBm, with the first output channel having a peak power of 8.52 dBm. The experimental set up that consists of only 4 optical components, is simple, devoid of the complex structure employed previously to enhance the tunability and feedback mechanism normally associated with multiwavelength Brillouin-Erbium Fiber laser sources. The generated output channels are stable, rigidly separated by 10 GHz (0.08 nm).
-
novel multiwavelength l band brillouin Erbium Fiber laser utilizing double pass brillouin pump preamplified technique
IEEE Journal of Selected Topics in Quantum Electronics, 2009Co-Authors: M H Almansoori, M A Mahdi, Malin PremaratneAbstract:We experimentally demonstrate successful operation of an enhanced multiwavelength L-band Brillouin-Erbium Fiber laser and analyze its performance under various operating conditions. This scheme utilizes double-pass amplification technique to preamplify the Brillouin pump (BP) power within the laser cavity before entering the single-mode Fiber. Owing to this double-pass pre-amplification within the Erbium gain medium, the proposed laser structure is able to operate at low pumping power and exhibits a low-threshold power of 15.9 mW. Moreover, the double-pass pre-amplification of BP is able to shift the unstable operation of the laser to a higher pump power, enabling us to generate high-power laser signals. We experimentally show that the proposed novel setup can produce up to 30 channels at 40 and 0.035 mW of 1480 nm pump and BP powers, respectively. An obvious suppressant for unstable self-lasing cavity modes because of the effect of homogenous saturation of the Erbium-doped Fiber gain due to the high intensity of BP is observed in the laser cavity configuration.
Mohd Adzir Mahdi - One of the best experts on this subject based on the ideXlab platform.
-
Multiwavelength Brillouin-Erbium Fiber laser with double-Brillouin-frequency spacing
Optics Express, 2011Co-Authors: Y. G. Shee, Mohammed Hayder Al-mansoori, Alyani Ismail, Salasiah Hitam, Mohd Adzir MahdiAbstract:We demonstrate a multiwavelength Brillouin-Erbium Fiber laser with double-Brillouin-frequency spacing. The wider channel spacing is realized by circulating the odd-order Stokes signals in the Brillouin gain medium through a four-port circulator. The circulated odd-order Stokes signals are amplified by the Brillouin gain and thus produce even-order Stokes signals at the output. These signals are then amplified by Erbium gain block to form a ring-cavity laser. Ten channels with 0.174 nm spacing that are generated at 0.5 mW Brillouin pump power and 150 mW pump power at 1480 nm can be tuned from 1556 nm to 1564 nm. The minimum optical signal-to-noise ratio of the generated output channels is 30 dB with maximum power fluctuations of ±0.5 dB.
-
optimization of brillouin pump wavelength location on tunable multiwavelength befl
Laser Physics, 2009Co-Authors: Abd Z Rahman, M H Almansoori, S Hitam, A F Abas, M Abu H Bakar, Mohd Adzir MahdiAbstract:Optimization of Brillouin pump (BP) wavelength location on tunable multiwavelength Brillouin-Erbium Fiber laser (BEFL) with BP pre-amplified technique is experimentally investigated. The tunable multiwavelength BEFL is achieved by utilization a tunable band-pass filter in a laser cavity. The optimum BP power and BP wavelength location within the filter bandwidth is determined in order to obtain the maximum stable output channels. Optimum distance of launching the BP wavelength is found at 0.80 nm shorter from the center wavelength of the filter bandwidth. 15 stable output channels are achieved from the tunable Fiber laser system within the optimum range of BP power which is found to be between 5.2 to 5.7 dBm.
-
Brillouin-Erbium Fiber laser with enhanced feedback coupling using common Erbium gain section
Optics express, 2008Co-Authors: Norhakimah Md. Samsuri, Mohammed Hayder Al-mansoori, A.k. Zamzuri, A. Ahmad, Mohd Adzir MahdiAbstract:We demonstrate an enhanced architecture of Brillouin-Erbium Fiber laser utilizing the reverse-S-shaped Fiber section as the coupling mechanism. The enhancement is made by locating a common section of Erbium-doped Fiber next to the single-mode Fiber to amplify the Brillouin pumps and the oscillating Stokes lines. The requirement of having two Erbium gain sections to enhance the multiple Brillouin Stokes lines generation is neglected by the proposed Fiber laser structure. The mode competitions arise from the self-lasing cavity modes of the Fiber laser are efficiently suppressed by the stronger pre-amplified Brillouin pump power before entering the single mode Fiber section. The maximum output power of 20 mW is obtained from the proposed Fiber laser with 10 laser lines that equally separated by 0.089 nm spacing.
-
Tunable range enhancement of Brillouin-Erbium Fiber laser utilizing Brillouin pump pre-amplification technique
Optics Express, 2008Co-Authors: Mohammed Haydar Al-mansoori, Mohd Adzir MahdiAbstract:We demonstrate an enhanced multiwavelength L-band Brillouin-Erbium Fiber laser (BEFL), in which the Brillouin pump is pre-amplified before entering the single-mode Fiber. The Brillouin pump pre-amplification provided by the Erbium-doped Fiber has created higher intensity of Brillouin Stokes line generated in the single-mode Fiber that leads to the homogenous gain saturation. Thus the built-up of self-lasing cavity modes is suppressed in a wider wavelength range. In contrary to the conventional linear-cavity BEFL, the number of output channels is enhanced within the same tuning range.
-
Tunable multiwavelength Brillouin-Erbium Fiber laser with intra-cavity pre-amplified Brillouin pump
Laser Physics Letters, 2008Co-Authors: Mohammed Hayder Al-mansoori, Mohd Adzir Mahdi, A.k. ZamzuriAbstract:We have demonstrated a new configuration of Brillouin-Erbium Fiber laser, in which the Brillouin pump is pre-amplified within the laser cavity before entering the single-mode Fiber. By using this simple scheme, a lower external Brillouin pump power is required to create the Brillouin gain and suppresses the laser cavity modes. The proposed laser structure exhibits a wide tuning range of 13 nm from 1597 nm to 1610 nm with 1480 nm pump power of 100 mW. The number of channels obtained within this wavelength range is 14 channels with 0.089 nm spacing.
Pankaj Kumar Choudhury - One of the best experts on this subject based on the ideXlab platform.
-
low threshold and efficient multi wavelength brillouin Erbium Fiber laser incorporating a Fiber bragg grating filter with intra cavity pre amplified brillouin pump
Laser Physics Letters, 2009Co-Authors: M Mohd N Nasir, M H Almansoori, Z Yusoff, H Abdul A Rashid, Pankaj Kumar ChoudhuryAbstract:A low threshold and efficient multi-wavelength Brillouin-Erbium Fiber laser with a pre-amplified Brillouin pump within a Fabry-Perot cavity is presented. With the utilization of a Fiber Bragg grating filter as one of the Fiber loop mirrors, up to 25 stable Brillouin Stokes lines could be generated with channel spacing of 0.088 nm. The architecture of the design consumes only 3 dBm of the Brillouin pump power and 90 mW of the 980 nm laser diode to produce the 25 maximum output channels. The signal to noise ratio of each channel was also observed to be not less than 20 dB.
-
broadly tunable multi wavelength brillouin Erbium Fiber laser in a fabry perot cavity
Laser Physics Letters, 2008Co-Authors: M Mohd N Nasir, M H Almansoori, Z Yusoff, H Abdul A Rashid, Pankaj Kumar ChoudhuryAbstract:The paper demonstrates the utilization of a tunable band-pass filter in producing tunable multi-wavelength Brillouin-Erbium Fiber lasers within a Fabry-Perot cavity. The optimization of the Brillouin pump wavelength position within the bandwidth of the self-lasing cavity modes is important to achieve the maximum stable output channels. The same number of 14 output channels with constant channel spacing of 10.5 GHz were able to be generated within 32 nm range. Besides the tunability, this design also has the advantage of consistent power requirement of both the 980 nm laser diode and the Brillouin pump in generating the 14 channels through the broad tuning range.
Evgueni M Dianov - One of the best experts on this subject based on the ideXlab platform.
-
saturation parameters studies of carbon nanotube based thin film saturable absorbers for Erbium Fiber laser mode locking
International Conference Laser Optics, 2016Co-Authors: Alexander A Krylov, Elena D. Obraztsova, Stanislav G Sazonkin, N R Arutyunyan, V V Grebenyukov, A S Pozharov, D A Dvoretskiy, A B Pnev, V E Karasik, Evgueni M DianovAbstract:We have experimentally studied saturation behavior of Single-Walled Carbon Nanotube-based saturable absorbers at different temperatures and SWCNT concentrations in the carboxymetylcellulose polymer matrix and related it to the mode-locked Erbium-doped Fiber laser performance.
-
performance peculiarities of carbon nanotube based thin film saturable absorbers for Erbium Fiber laser mode locking
Journal of The Optical Society of America B-optical Physics, 2016Co-Authors: Alexander A Krylov, Elena D. Obraztsova, Stanislav G Sazonkin, N R Arutyunyan, V V Grebenyukov, A S Pozharov, D A Dvoretskiy, Evgueni M DianovAbstract:We have studied the saturation behavior of single-walled carbon-nanotube-based saturable absorbers (SWCNT-SAs) at different temperatures and SWCNT concentrations in the polymer matrix and tried to relate it to the mode-locked Erbium-doped Fiber laser performance. It has been observed that a modulation depth of SWCNT-SA transmission which we relate to the ground state recovery time monotonically decreases upon temperature growth. Comparing laser performance with different SWCNT-SAs, we suppose that the defects in the CNT lattice promote recovery acceleration resulting in shorter pulse generation as obtained for boron-nitride-doped SWCNTs. Moreover, for the first time, to the best of our knowledge, we have observed and studied the long-term relaxation of SWCNT-SA saturated transmission exhibiting temperature-dependent behavior.
-
mode locked 1 93 μm thulium Fiber laser with a carbon nanotube absorber
Optics Letters, 2008Co-Authors: Ma A Solodyanki, Alexande I Chernov, A V Tausenev, Elena D. Obraztsova, Vitalii I Konov, Anatoly S. Lobach, Evgueni M DianovAbstract:We report a ring-cavity thulium Fiber laser mode locked with a single-wall carbon nanotube absorber used in transmission. A carboxymethyl cellulose polymer film with incorporated carbon nanotubes synthesized by the arc discharge method has an absorption coinciding with in the amplification bandwidth of a Tm-doped Fiber. This laser is pumped by an Erbium Fiber laser at 1.57 μm wavelength and produces a 37 MHz train of mode-locked 1.32 ps pulses at 1.93 μm wavelength with an average output power of 3.4 mW.
M A Mahdi - One of the best experts on this subject based on the ideXlab platform.
-
realization of a low threshold multiwavelength brillouin Erbium f iber laser by optimizing the reflected power
Chinese Optics Letters, 2012Co-Authors: A W Alalimi, M H Almansoori, A F Abas, M A Mahdi, M MokhtarAbstract:A multiwavelength Brillouin/Erbium Fiber laser (BEFL) with low threshold power is realized. A low threshold power of 3 mW and a wide tuning range of 18 nm can be achieved by controlling the reflected power in the nonlinear optical loop mirror (NOLM). Up to 24 lines with a wavelength spacing of 0.086 nm are generated at the Brillouin pump and at the 1 480-nm pump with ?0.5 dBm (0.9 mW) and 25 mW of power, respectively.
-
seamless tuning range based on available gain bandwidth in multiwavelength brillouin Fiber laser
Optics Express, 2009Co-Authors: M Ajiya, M H Almansoori, S Hitam, M A Mahdi, M MokhtarAbstract:We experimentally demonstrate a simple widely tunable multiwavelength Brillouin/Erbium Fiber laser that can be tuned over the entire C-band, thereby greatly improving the tuning range limitation faced by the previous Brillouin-Erbium Fiber laser architectures. Tuning range of 39 nm from 1527 nm to 1566 nm, which is only limited by the amplification bandwidth of the Erbium gain was successfully achieved. At Brillouin pump wavelength of 1550 nm and 1480 nm laser pump and Brillouin pump powers of 130 mW and 2 mW respectively, all the generated output channels have peak power above 0 dBm, with the first output channel having a peak power of 8.52 dBm. The experimental set up that consists of only 4 optical components, is simple, devoid of the complex structure employed previously to enhance the tunability and feedback mechanism normally associated with multiwavelength Brillouin-Erbium Fiber laser sources. The generated output channels are stable, rigidly separated by 10 GHz (0.08 nm).
-
novel multiwavelength l band brillouin Erbium Fiber laser utilizing double pass brillouin pump preamplified technique
IEEE Journal of Selected Topics in Quantum Electronics, 2009Co-Authors: M H Almansoori, M A Mahdi, Malin PremaratneAbstract:We experimentally demonstrate successful operation of an enhanced multiwavelength L-band Brillouin-Erbium Fiber laser and analyze its performance under various operating conditions. This scheme utilizes double-pass amplification technique to preamplify the Brillouin pump (BP) power within the laser cavity before entering the single-mode Fiber. Owing to this double-pass pre-amplification within the Erbium gain medium, the proposed laser structure is able to operate at low pumping power and exhibits a low-threshold power of 15.9 mW. Moreover, the double-pass pre-amplification of BP is able to shift the unstable operation of the laser to a higher pump power, enabling us to generate high-power laser signals. We experimentally show that the proposed novel setup can produce up to 30 channels at 40 and 0.035 mW of 1480 nm pump and BP powers, respectively. An obvious suppressant for unstable self-lasing cavity modes because of the effect of homogenous saturation of the Erbium-doped Fiber gain due to the high intensity of BP is observed in the laser cavity configuration.
-
widely tunable linear cavity multiwavelength brillouin Erbium Fiber lasers
Optics Express, 2005Co-Authors: M H Almansoori, Kamil M Abdrahma, F Mahamd R Adika, M A MahdiAbstract:Wideband multiwavelength Brillouin-Erbium Fiber laser (BEFL) utilizing a linear cavity is presented, highlighting the usage of higher Brillouin and lower Erbium doped-Fiber pump powers to achieve higher lasing spectral bandwidth. A tuning range of 60 nm has been obtained from 1525 to 1585 nm. The dependency of the Stokes signal tuning range on the laser’s pumping power is also elaborated. The wide tuning range of the proposed BEFL has potential in dense wavelength division multiplexing communication systems.