OPTICAL SYSTEMS UTILIZING OPTICAL FIBERS TRANSMITTING HIGH POWER SIGNAL AND A METHOD OF OPERATING SUCH SYSTEMS

摘要

An optical system comprises an optical fiber with gain producing core with an index of refraction nSUB1/SUB, surrounded by at least one cladding with an index of refraction nSUB2/SUB, said cladding including at least one index reduced area with an index of refraction nSUB2/SUB, such that nSUB1/SUBnSUB2/SUBnSUB2/SUB, the core propagating signal at a spatial fundamental mode at a signal wavelength ?SUB1/SUB and at a power level sufficient to generate optical power at a wavelength ?SUB2/SUB, where ?SUB2/SUB ?SUB1/SUB , and the optical fiber has at least one cut-off fundamental spatial mode wavelength ?SUBc/SUB, and ?SUB1/SUB ?SUBc/SUB and ?SUB2/SUB?SUBc/SUB.