scholarly journals Design of Multiwavelength EDF-Raman Lasers Utilizing Mach-Zehnder Interferometer

2021 ◽  
Vol 2075 (1) ◽  
pp. 012012
Author(s):  
Nani Fadzlina Naim ◽  
Awangku Nur Azree Awang Azlan ◽  
Muhammad Faiz Ibrahim ◽  
Suzi Seroja Sarnin ◽  
Norsuzila Ya’acob ◽  
...  
Keyword(s):  
Peak Power ◽  
Ring Cavity ◽  
Gain Medium ◽  
Zehnder Interferometer ◽  
Linear Cavity ◽  
Raman Fiber Laser ◽  
Mode Suppression ◽  
Cavity Structure ◽  
Multiwavelength Laser ◽  
Mach Zehnder Interferometer

Abstract This paper presents the design of multiwavelength Erbium Doped Fiber (EDF)-Raman fiber laser utilizing Mach-Zehnder Interferometer (MZI) with various cavity structures. A multiwavelength laser employing hybrid gain medium of EDF-Raman amplifier is simulated using OptiSystem software. Three cavity structures of multiwavelength laser such as unidirectional, bidirectional and ring cavity are simulated and analysed. From the simulation result, it is found that ring cavity structure produced the best performance whereas at 1000 mW pump power, up to 19 lasing lines were obtained in the ring cavity, compared to 18, and 16 lasing lines in the unidirectional and bidirectional linear cavity, respectively. All multiwavelength fiber lasers exhibit the same line spacing of 4.9 nm. In addition, at coupling coefficient of 0.9, up to 49.5 dB of side mode suppression ratio (SMSR) were achieved in the ring cavity structure, compared to 49.2 dB, and 30.3 dB of SMSR in the unidirectional and bidirectional linear cavity, respectively. However, bidirectional linear cavity exhibits the highest peak power of 2.07 dBm, compared to -17.4 dBm, and -15.5 dBm of peak power in the unidirectional linear and ring cavity, respectively.

scholarly journals Generation of stable penta-wavelength ytterbium doped fiber laser by spatial-mode beating in 1-µm waveband

2021 ◽  
Vol 2075 (1) ◽  
pp. 012007
Author(s):  
M A Mat Salim ◽  
M A Ismail ◽  
Saaidal R Azzuhri ◽  
M Z A Razak ◽  
H Bakhtiar ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Peak Power ◽  
Ring Cavity ◽  
Reliable System ◽  
Power Fluctuation ◽  
Fiber Ring ◽  
Mode Suppression ◽  
Multi Wavelength ◽  
Mode Beating ◽  
Side Mode

Abstract Penta-wavelength ytterbium doped-fiber laser had been successfully generated by usingspatial mode beating method at room temperature. A G652D premium fiber patch cable was inserted inside the polarization controller (PC) and connected to an ytterbium-doped fiber ring cavity. By increasing the pump power, stable multi-wavelength with side-mode suppression ratio (SMSR) from 25 dB to 40 dB were obtained from dual-wavelength and up to penta-wavelengths respectively. The uniform wavelength interval spacing was 0.67 nm whereas peak power fluctuation and wavelength shifts were 0.6 dBm and 0.01 nm, respectively for all sets of multi-wavelength. These simple, easy and reliable system offer a stable multi-wavelength generation in a 1-micrometer waveband.

THE COMPARISON NONLINEARITY BEHAVIORS OF PHOTONIC CRYSTAL FIBER BY TWO REDUCED LENGTHS OF BI-EDF IN RING CAVITY

2009 ◽  
Vol 18 (03) ◽  
pp. 521-527 ◽  
Author(s):  
S. SHAHI ◽  
M. R. A. MOGHADDAM ◽  
S. W. HARUN ◽  
H. AHMAD
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Ring Cavity ◽  
Gain Medium ◽  
Crystal Fiber ◽  
Mode Suppression ◽  
Brillouin Pump ◽  
Erbium Doped ◽  
Brillouin Gain ◽  
Stimulated Brillouin

The nonlinearity effects of photonic crystal fiber (PCF) in a ring resonator for different lengths of Bismuth erbium-doped fiber (Bi-EDF) as the Brillouin gain medium is investigated. Bi-EDF (215 cm) itself has high stimulated Brillouin effect at 150 mW that is generated at 1480 nm pump power. The proposed Brillouin fiber laser (BFL) with PCF operates at 1559 nm for 49 cm Bi-EDF, which is upshifted by 0.08 nm from the Brillouin pump with a side-mode suppression ratio more than 12 dB. As a result of using reduced length of PCF and two long Bi-EDF, the BFL is stable at room temperature and compact in this report.

scholarly journals Generation of single and double pulses using a symmetrical Mach–Zehnder interferometer employing microstructured chalcogenide fibres: numerical analysis

2019 ◽  
Vol 59 (1) ◽  
Author(s):  
Ming-Hui Jin ◽  
Shi-Han Yang ◽  
Jian-Wei Wu
Keyword(s):  
Phase Shift ◽  
Phase Difference ◽  
Phase Modulation ◽  
Peak Power ◽  
Continuous Wave ◽  
Output Port ◽  
Zehnder Interferometer ◽  
Numerical Work ◽  
Significant Phase ◽  
Mach Zehnder Interferometer

In this numerical work, a Mach–Zehnder interferometer device with sample and reference arms composed of microstructured chalcogenide optical fibres with AsSe2 core and As2S5 cladding is presented to generate single and double pulses. An unchirped hyperbolic secant-shaped pulse with enough high peak power centered at 1958 nm wavelength and a continuous wave with a very weak power level at 2070 nm wavelength are simultaneously introduced into the sample arm, in which stimulated Raman scattering and strong cross-phase modulation induced by two co-propagating waves give rise to a significant phase shift for a continuous wave. In the reference arm, the continuous wave directly passes through the fibre, where the transmitted wave has a slight phase shift due to the influence of self-phase modulation. Therefore, at the output port of the configuration, the re-combined optical fields at 2070 nm wavelength have a significant phase difference. As a result, both single and double pulses caused by the optical interference at the output port are achieved by judiciously adjusting the phase difference which is mainly controlled by the peak power and temporal width of the input optical pulse, as well as the length of a microstructured optical fibre. In addition, both widths of the single pulse and spacing of the double pulses are directly dependent on the temporal width of the input pulse and the fibre length of the arm.

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