A tunable wavelength erbium doped fiber ring laser, based on mechanically induced long-period fiber gratings (MLPFG) is presented. The laser was tuned applying pressure over the MLPFG, in order to control this, pressure is applied over a plate with periodic grooves that has a short length, this pressure is applied by a digital torque tester, as a result tunable effect is observed. The grooves have a period of 630μm and the maximal pressure without breakpoint fiber is around 0.80lb-in2. Furthermore, the MLPFG used can be erased, reconfigured and exhibit a transmission spectra with thermal stability, similar to high cost photoinduced long period gratings. In this work, by pressure increment distributed over the MLPFG from 0.20 lb-in2 to 0.50 lb-inμ, tuned operation range of 10nm was observed and single line emission was tuned between C and L telecommunications bands. According to the stability analysis the signal to noise ratio and linewidth observed were 35dB and 0.2nm respectively.
We present the fabrication and characterization of a mechanically induced long period grating (MLPG) using a grating period of 400 μm and 1m of NZ-DSF. Pressure is gradually applied up to 120 Lb at different angles like 0, 30, 45 and 60 degrees. An attenuation band is observed centered at a wavelength around 1064nm using a fiber position of 30 degrees with respect to the grating´s metal plate and a maximum pressure of 145 Lb. The loss band presents a maximum depth of 22dB and a bandwidth of approximately 10nm. Torsion and curvature characterizations did not change the output spectrum of the optical grating. However, temperature characterization depicted a small shifting which could be insignificant for some applications. Still, there is 16dB attenuation as temperature increases in a range from room temperature up to 450°C. These preliminary studies show that this 1064 nm centered wavelength MILPG might be used in a low linear dynamic range with temperature (75-300)°C as a temperature sensor.
We present the results from the fabrication and characterization of mechanically induced long period fiber gratings in
polarization maintaining photonic crystal fiber (PM-PCF). A supercontinuum source in the range of 600nm - 1700nm is
used. This source is generated using a micro-chip laser at 1064nm and a single mode fiber. A long-period grating is
induced over 40mm long unjacketed PCF using a V-grooved aluminum plate. External pressure is gradually applied with
a metal screw and a torque meter and a loss dip with resonance wavelength is observed. Low insertion losses are
depicted from (1-3) dBm with a bandwidth of about 30nm and a loss dip around 15dBm. Sensitivity for this preliminary
work is found at 27 dB/Lb. Several applications are potentially possible with the optimization of the transmission
spectrum controlled by applied pressure.
We show the sensing of load by means mechanically induced long-period fiber grating (MLPFG) made by applying
pressure by means a screw to a pair of grooved plates over single-mode fiber. We used a torquemeter in order to obtain
precision in the adjustment screw and thus establish an equilibrium pressure applied to a specific region of the optical
fiber to form the long-period grating mechanically induced fiber. The increase the torque to screw, the resonance
wavelength of MLPFG increases its depth over 16 dB. We use a detector to observe the changes amplitude according to
the fiber pressure.
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