Abstract
To achieve wavelength-selectable and stable erbium-doped fiber (EDF) laser, a dual-Sagnac-ring configuration is designed to reach single-longitudinal-mode (SLM) oscillation and power-flattened output simultaneously. The presented and experimentally demonstrated EDF laser can also obtain the output power of 7.5 to 11.8 dBm in the continuous-wave (CW) tunability of 1523.0 to 1571.0 nm. Here, the power variation of lasing wavelength can be below than 1.0 dB over a wide working range of 1525.0-1565.0 nm for power-flattened output. Moreover, the 3-dB spectrum linewidth of presented EDF-based laser is measured in the range of 16.4-22.2 kHz via the Lorentzian fitting.
Highlights
In the near future, erbium-doped fiber (EDF) based lasers have interested great considerations in keeping with its huge applications in optical sensor, optical communication, wavelength division multiplexing (WDM), millimeter-wave photonic, biophotonics, and spectroscopy [1]–[4]
While the stable lasing wavelength with optimal output power is achieved, it means that the polarization state could be retained properly in the measurement
The tunable pandpass filter (TBF) with 6 dB insertion loss is applied inside a laser cavity to tune different output wavelength and filter the optical noise for reaching the better optical signal to noise ratio (OSNR)
Summary
Erbium-doped fiber (EDF) based lasers have interested great considerations in keeping with its huge applications in optical sensor, optical communication, wavelength division multiplexing (WDM), millimeter-wave photonic, biophotonics, and spectroscopy [1]–[4]. To achieve the flattened output power and SLM oscillation, a dual-Sagnac-ring scheme is proposed and used in EDF based laser. The output power of 7.5 to 11.8 dBm and optical signal to noise ratio (OSNR) of 30.2 to 38.2 dB are obtained in the presented EDF based laser.
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