Power matching and noise matching are well known established approaches, though they are not the only strategies for designing an optimal receiver. If the best SNR is the design goal, then obviously noise matching is the choice, while for obtaining the highest signal level, power matching has to be chosen. In fact the matching two port between the antenna and a commercial low noise amplifier (L...

We report theoretical results on the wavelength stability of a multisection master-oscillator power-amplifier emitting at 1064 nm. use traveling wave equation model to calculate optical output power and spectral maps versus currents injected into different sections device. The numerical explains quantitatively experimental findings, particularly collapse if current control section adjacent dist...

A selective and sensitive quartz enhanced photoacoustic spectroscopy (QEPAS) sensor, employing an erbium-doped fiber amplifier (EDFA), and a distributed feedback (DFB) laser operating at 1582 nm was demonstrated for simultaneous detection of ammonia (NH₃) and hydrogen sulfide (H₂S). Two interference-free absorption lines located at 6322.45 cm(-1) and 6328.88 cm(-1) for NH₃ and H₂S detection, re...

2. Working Equations of the Vibrating-Wire Instrument Our implementation [1] of the steady-state vibrating-wire technique is similar to that described by Audonnet and Pádua [2] in which the wire is driven at frequency f by a constant sinusoidal current I, and the emf V(f) generated across the vibrating wire is measured with a two-phase lock-in amplifier. This measured emf generally comprises tw...

We describe a continuous-wave master-oscillator power-amplifier system based on a distributed Bragg reflection diode laser and an Yb doped fiber amplifier. The observed optical spectrum of the amplified seed source can be tailored to arbitrary shapes and widths between 30 MHz and greater than 1 GHz by controlling the radio frequency modulation wave form of the injection current. © 2006 American...