Abstract
We report the first single mode fibre ring laser which uses a transmission fibre grating filter for selection of a single mode. Fibre gratings have been used in reflection mode in conjunction with a rare earth doped Sagnac loop to produce single mode operation1, but these are inefficient because a proportion of the internal laser power is reflected in the counter direction to the main lasing direction and this is absorbed in the isolator. The development of broad band chirped fibre gratings2 and transmission fibre gratings3,4 has enabled a ring unidirectional ring laser to be built using all fibre components with the exception of a fibre coupled optical isolator. The advantage of a fibre ring laser is that it provides an efficient narrow linewidth source which can be tuned across the erbium fibre amplifier gain bandwidth. We also show that the laser can be used as a sensitive strain sensor.
© 1995 Optical Society of America
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