All fiber passively mode locked zirconium-based erbium-doped fiber laser

All passively mode locked erbium-doped fiber laser with a zirconium host is demonstrated. The fiber laser utilizes the Non-Linear Polarization Rotation (NPR) technique with an inexpensive fiber-based Polarization Beam Splitter (PBS) as the mode-locking element. A 2 m crystalline Zirconia–Yttria–Alumino-silicate fiber doped with erbium ions (Zr–Y–Al-EDF) acts as the gain medium and generates an Amplified Spontaneous Emission (ASE) spectrum from 1500 nm to 1650 nm. The generated mode-locked pulses have a spectrum ranging from 1548 nm to more than 1605 nm, as well as a 3-dB bandwidth of 12 nm. The mode-locked pulse train has an average output power level of 17 mW with a calculated peak power of 1.24 kW and energy per pulse of approximately 730 pJ. The spectrum also exhibits a Signal-to-Noise Ratio (SNR) of 50 dB as well as a repetition rate of 23.2 MHz. The system is very stable and shows little power fluctuation, in addition to being repeatable.

► A novel method of employing the Non-Polarization Rotation (NPR) technique using an inexpensive Polarization Beam Splitter (PBS) is proposed in conjunction with a Zirconia–Yttria–Aluminum codoped in erbium silica fiber (Zr–Y–Al-EDF) to generate mode-locked pulses.
► Amplified Spontaneous Emission (ASE) output exhibits a spectrum that stretches from 1500 nm to 1650 nm as compared to ASE spectrum of erbium in a silical fiber, which ranges from 1520 nm to 1580 nm. This will help to generate shorter pulse-width durations.
► The proposed system has a Signal-to-Noise Ratio (SNR) of approximately 50 dB with an average output power of 17 mW as well as a repetition rate of 23.2 MHz with a calculated peak power of 1.24 kW.
► The system is highly stable and exhibits only minimal power fluctuations.