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Introduction to Sensors
Published in Banshi Dhar Gupta, Anand Mohan Shrivastav, Sruthi Prasood Usha, Optical Sensors for Biomedical Diagnostics and Environmental Monitoring, 2017
Banshi Dhar Gupta, Anand Mohan Shrivastav, Sruthi Prasood Usha
Optical power meter is used for the measurement of the power in an optical signal. It is usually used for the determination of the power of the light guided through fiber-optic cable. It is made up of a calibrated sensor interfaced with an amplifier and display. It is also used for the observation of power loss in the optical signal when light is guided through the fiber. In the case of sensing applications, it is used for analyzing the output power through the fiber-optic sensor after transducer recognizes the interaction of the analyte and the recognition unit (Gupta 2006).
Installation and Testing
Published in Lynne D. Green, Fiber Optic COMMUNICATIONS, 2019
The most commonly used piece of test equipment is the optical power meter. An optical power meter consists of a photodiode and amplifier, usually with a digital readout. The amplifier is designed for linearity and wide dynamic range. Optical power meters can be calibrated at more than one wavelength within either the short– or long–wavelength window. Figure 10-1 shows the block diagram of a typical power meter. Power meters are designed for low noise, and typically have very low bandwidth. Power meters may also include signal averaging to improve noise rejection.
Testing & Measurement Techniques
Published in David R. Goff, Kimberly Hansen, Michelle K. Stull, Fiber Optic Reference Guide, 2002
David R. Goff, Kimberly Hansen, Michelle K. Stull
Optical Power Meter: This instrument measures the amount of optical power in a fiber. Most models handle several wavelengths and provide relative (dB) as well as absolute (dB or Watts) measurements. Multiple adapters are usually required to deal with different optical connector types.
Tungsten tri-oxide (WO3) film absorber for generating Q-switched pulses in erbium laser
Published in Journal of Modern Optics, 2020
Ahmed Shakir Al-Hiti, A. H. H. Al-Masoodi, H. Arof, Wei Ru Wong, S. W. Harun
The setup configuration of the proposed WO3 based Q-switched EDFL is shown in Figure 7. The resonator consists of a 0.5 m long-wavelength division multiplexer (WDM) fibre, a 2 m long EDF, an optical isolator, 3 dB output coupler and the WO3 SA device. The total cavity length is about 8 m. The EDF has a 4 μm core diameter, 0.16 numerical aperture and 23 dB/m Erbium ion absorption rate at 980 nm. The fibre is pumped by a 980 nm laser diode via the WDM on the forward pumping scheme. The isolator is used to prevent reflection in the ring cavity and ensure unidirectional operation of the oscillating laser. The output coupler allows half of the laser output to be taken out for observation and the other half to remain in the ring cavity. An optical spectrum analyser (OSA) with a 0.07 nm spectral resolution is used to measure the optical spectrum of the laser while an optical power meter is used to measure the average output power of the laser. The output pulse train is analysed using a 500-MHz digital oscilloscope via a photodetector. An electrical radio frequency (RF) spectrum signal is obtained by using a 7.8 GHz RF spectrum analyser to evaluate the stability of the laser and the Q-switching repetition rate.