Double-ring Laser Research Articles

A wide tunable fiber laser for two independent C-band and l-band wavelengths

A double-ring laser with a single 1480nm pump was proposed and demonstrated using the combination of a ring coupler and a C/L-band coupler. One ring for an L-band wavelength was pumped by a lasing light which was transferred from the other ring for a C-band wavelength. The laser had a total bandwidth of 70nm, with 35nm continuously tunable at each wavelength band within a 1dB power deviation. High lasing powers of more than 0dBm were maintained as the pump power decreased to 60mW. This laser also supported two independent tunable lasing wavelengths at the same time. The 1557nm pumped L-band lasing had 25% improvement in power conversion efficiency and 60% reduction in threshold pump power compared with directly 1480-nm-pumped L-band lasing. This wide bandwidth and highly power-equalized laser was achieved with high output lasing power and low power consumption.

Dual-wavelength S-band erbium-doped fiber double-ring laser

We propose and demonstrate an S-band CW dual-wavelength erbium-doped fiber (EDF) dual-ring laser using a compound-ring filter (CRF) with various coupling losses inside the gain cavity. Employing a ring filter combined within the cavity, the fiber laser can lase a dual wavelength without any filter inside the ring loop. The dual-wavelength output exhibits a good performance having optical side-mode suppression ratios (SMSRs) of 31.6 and 31.8 dB and output powers of −9.6 and −9.3 dBm at 1505.58 and 1506.43 nm, respectively, when the coupling loss is 30% inside the cavity. In addition, the output stabilities of the dual-wavelength laser have also been analyzed.

A Wavelength-Tunable Erbium-Doped Fiber Double-Ring Laser with Stabilized Single-Frequency Operation

A stable and tunable fiber double-ring laser based on erbium-doped fiber amplifier (EDFA) has been proposed and experimentally demonstrated. Widely tunable range from 1527 to 1567 nm, the side-mode suppression ratio (SMSR) of >45.6 dB/0.05 nm and the output power of >1.04 dBm in the operating range from 1535 to 1565 nm can be achieved for this ring laser. By applying the double-ring configuration, the ring laser is stabilized. The central wavelength variation of <0.02 nm and the power fluctuation of <0.03 dBm can therefore be retrieved.

Stable and tunable fiber double-ring laser based on an erbium-doped waveguide amplifier

A stable and tunable fiber double-ring laser based on an erbium-doped waveguide amplifier (EDWA) is proposed and experimentally demonstrated. A widely tunable range from 1527 to 1567 nm, the side-mode suppression ratio (SMSR) of >45.6 dB/0.05 nm and the output power of >1.04 dBm in the operating range from 1535 to 1565 nm can be achieved for this ring laser. By applying the double-ring configuration, the ring laser is stabilized. The central wavelength variation of <0.02 nm and the power fluctuation of <0.03 dBm can therefore be retrieved.

Stable and wavelength-tunable erbium-doped fiber double-ring laser in S-band window operation

A stable and tunable S-band erbium-doped fiber (EDF) double-ring laser has been proposed and experimentally demonstrated. Based on the double-ring configuration, the EDF ring laser exhibits more stable output wavelengths and powers than those of the single-ring. Wide tunable range of 1484–1518nm, the side-mode suppression ratio (SMSR) of larger than 44.7dB/0.05nm and the output power of larger than −2.2dBm over the operation range of 1484–1510nm have been retrieved.

Broadband C- plus L-band double-ring fiber laser based on a two-stage hybrid amplifier

A stable and wavelength-tunable C- plus L-band fiber double-ring laser, which uses a two-stage hybrid amplifier with a semiconductor optical amplifier and an erbium-doped fiber amplifier, has been proposed and experimentally demonstrated. Based on the double-ring configuration, the proposed fiber ring laser exhibits more stable output wavelengths and powers than the single-ring laser. A wide tunable range of 1540 to 1620 nm, a side-mode suppression ratio (SMSR) of >31.2 dB/0.05 nm over a wide tuning range from 1550 to 1612 nm, and an output power of >2 dBm over the operation range of 1546 to 1608 nm have been achieved.