Optical amplifier

The emission wavelength of the pump laser (5) of an erbium doped fibre amplifier is locked to the peak in the absorption characteristic of its amplifier fibre (4) by means of a feedback loop employing a photodiode (8) to monitor the proportion of the pump power transmitted through the amplifier fibr...

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Bibliographic Details
Main Author ANDREW NIALL ROBINSON
Format Patent
LanguageEnglish
Published 23.11.1994
Edition5
Subjects
BASIC ELECTRIC ELEMENTS
DEVICES USING STIMULATED EMISSION
ELECTRICITY
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Summary:The emission wavelength of the pump laser (5) of an erbium doped fibre amplifier is locked to the peak in the absorption characteristic of its amplifier fibre (4) by means of a feedback loop employing a photodiode (8) to monitor the proportion of the pump power transmitted through the amplifier fibre while the wavelength of the laser is being dithered by means of a tone generator 11. The output of the photodiode 8 is applied to a phase sensitive detector 12. The output of the latter is smoothed by an integrator 13 and is then used to regulate the temperature of the pump laser 5.
Bibliography:Application Number: GB19930010207