Dual-wavelength, all-PM Er/Yb fiber ring laser with wavelength and channel separation tunability

Summary form only given. Tunable multi-wavelength fiber laser sources have numerous applications in optical and RF communications and optical sensing. Specific applications include wavelength division multiplexing, wideband RF signal processing, multielement optical sensors, and optical soliton sources. To date, multi-wavelength operation and tunable single wavelength operation of fiber lasers have been demonstrated. The ability to adjust the channel spacing and tune the absolute frequency in a multi-wavelength laser system can provide many degrees of freedom in the fiber laser design. In this paper, we discuss a method for discretely tuning the channel spacing by using a polarization controller and experimentally demonstrate this concept with a dual-wavelength fiber laser source. We have recently demonstrated the continuous tuning capability of this source.