A 1.55‐μm semiconductor‐optical fiber ring laser

We demonstrate the first semiconductor‐optical fiber ring laser. The laser uses an InGaAsP traveling wave optical amplifier as the gain medium and a 1‐m length of highly birefringent fiber as the feedback loop. Output coupling is provided by a fiber directional coupler. The highly birefringent fiber is used as an intracavity wavelength filter, enabling single‐frequency oscillation with a narrow linewidth at a wavelength near 1.55 μm.

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