Patent
Low noise high power optical fiber amplifier
Reads0
Chats0
TLDR
In this article, an erbium-doped optical fiber amplifier was illustrated, in which the first wavelength is about 980 nm and the second wavelength was about 1480 nm, and forward pumping with the 980 nm wavelength adjacent the amplifier input to provide a low noise figure.Abstract:
A rare earth doped optical fiber amplifier is pumped at a first wavelength selected to provide a low noise figure, and at a second wavelength selected to provide a high power efficiency. An erbium-doped fiber amplifier is illustrated, in which the first wavelength is about 980 nm and the second wavelength is about 1480 nm. The amplifier is forward pumped with the 980 nm wavelength adjacent the amplifier input to provide a low noise figure. Backward pumping at the 1480 nm wavelength is provided adjacent the amplifier output to achieve a high power efficiency.read more
Citations
More filters
Patent
Multi-wavelength light amplifier
TL;DR: In this article, the first-stage and second-stage light amplifiers have different gain vs wavelength characteristics so that the multi-wavelength light amplifier has no wavelength-dependence of a gain thereof.
Patent
Multi-stage optical amplifier and broadband communication system
TL;DR: In this article, a multi-stage optical amplifier with at least a first Raman amplifier fiber and a second Rambus amplifier fiber is presented. But the optical fiber is configured to be coupled to at least one signal source and at least two pump sources that collectively produce a pump beam of wavelength λp.
Patent
WDM optical communication system with remodulators
TL;DR: In this article, the authors proposed an optical communication system capable of placing incoming information-bearing optical signals onto plural optical signal channels for transmission over an optical waveguide, where a plurality of optical amplifiers are positioned along the optical waveguide for amplifying plural optical signals simultaneously, and an external modulator for imparting information directly onto the carrier optical signal from the electrical signal.
Patent
Broadband sagnac raman amplifiers and cascade lasers
TL;DR: In this paper, the authors describe new developments in Sagnac Raman amplifiers and cascade lasers to improve their performance, which can be used advantageously to meet specifications for broad bandwidth, polarization independence, noise performance and multi-wavelength operation.
Patent
Method and apparatus for monitoring the momental wavelength of light, and an optical amplifier and an optical communication system which incorporate the method and apparatus to adjust gain tilt
TL;DR: In this article, a decoupling unit decouples a portion of the received input light, to provide a first signal representing the input light with the portion decoupled therefrom.
References
More filters
Patent
Fiber optic amplifier
Herbert J. Shaw,M.J.F. Digonnet +1 more
TL;DR: In this paper, the authors used a multiplexing coupler to combine the signal to be amplified and illumination from a pumping illumination source onto a single optical fiber, where the pumping illumination inverts the neodymium ions within the ND:YAG crystal.
Patent
End and side pumped laser
Josef Berger,Donald R. Scifres +1 more
TL;DR: In this paper, a combination of end and side pumping is used to produce high power pulsed output with little or no delay between side pump pulses and laser output pulses, with suppressed spiking due to gain switching, and with high modulation rates.
Patent
Forced-commutated current-source converter and AC motor drive using the same
TL;DR: In this paper, an AC-to-AC converter operating as a current-source between an AC input line and an AC output line connected to a load, for instance an AC motor, includes three groups of bilateral switches controlled selectively within each group so as to generate a quasi-square-wave current in each output phase while establishing a DC voltage between two of the output phases at a time, the third phase being idle, the magnitude of output voltage being controlled in relation to the firing angle of the switches and the frequency being established by controlling the duration of each square-wave
Patent
Broadband optical fiber laser
TL;DR: In this article, a single-mode optical fiber is formed into a laser cavity by including a suitable reflector at each of the two ends of a suitable length of the optical fiber so that the emitted optical signal oscillates therein.
Patent
Integrated feedback laser
TL;DR: Active materials having substantially time constant, spatially alternating variations in the propagation characteristics of the active materials produce laser oscillations when excited above a threshold of oscillation as discussed by the authors, which is not the case for active materials having a time constant propagation characteristics.