All-fiber tunable mode-locked laser by using low birefringence Lyot-filter

摘要

Wavelength tunable mode-locked fiber lasers have attracted significant interests because of their widespread application in biomedical research, spectroscopy, fiber-optic sensors, optical instrumentation and telecommunications . Currently, the dominant technology is based on semiconductor saturable absorber mirrors (SESAMs). However, these have a narrow tuning range, and require complex fabrication and packaging. Besides, although semiconductor saturable absorber mirror serves to be a sophisticated saturable absorber, the limited bandwidth is an inherent drawback of wavelength tuning. Another method is using tilted fiber grating as a filter. However, it will have huge insertion loss .