GAIN CLAMPED AMPLIFIER USING DOUBLE CLAD FIBER

摘要

The present invention relates to an optical amplifier, to a fixed-gain optical amplifier for making the optical amplifier without a loss of the bandwidth of the input optical signal. The invention To this end, the gain medium is adjacent to the exterior of the core, the core dopant for amplifying an optical signal adjacent to the outside of the first cladding, the first cladding has a lower refractive index than said core and said first clad the optical fiber including the second cladding having a lower index of refraction; Light-emitting element to provide a pumping light source for the population inversion of the gain medium; And is emitted from the gain medium, the population inversion by the pumping light source to the resonant spontaneous emission light traveling along said first cladding by including a resonance causes a laser oscillation in said first cladding. Thereby, the invention has the advantage that by causing a laser oscillation gain for fixing the primary cladding, to a fixed gain amplifier without optical loss of the bandwidth of the input optical signal. ; Double cladding, fixed-gain optical amplifier