Application Cases

Name of experiment：application of high voltage amplifier in the study of novel narrow line wide wavelength scanning fiber laser

Test equipment：filter, function generator, high voltage amplifier ATA-2021H, etc

Experimental purpose：according to the simulation parameters, the DCR-CC filter is built and verified by experiment. Construct a single-longitudinal mode narrow-line-width scanning fiber laser based on DCR-CC filter and C+ L-band EDFA and explore its performance.

Experimental process：

1. Construction and characterization of DCR-CC

The DCR-CC filter was built with the parameters of cavity length of 50.70cm and 52.00cm respectively, and the filtering performance of DCR-CC filter was measured with the system as shown in the figure.

2. Realization of C+L band laser gain range

The structure of the proposed C+L band single longitudinal mode narrow line width scanning fiber laser is shown in the figure. The two parts are connected in parallel by two Cl-band WDM. A self-made DCR-CC composite resonator filter is used as a large range filter element to screen SLM from the dense longitudinal mode of the main cavity. An FFP-TF acts as a wavelength scanning element and is driven by a function generator and high voltage amplifier ATA-2021H. FFP-TF and other devices in the dotted line frame can be replaced by CR-2 and the replacement FBG to measure the static laser output performance of the laser. 

Experimental result：

1.The following figure shows the intermediate laser operating stability at each of the four wavelengths within 60 minutes, measured using OSA repeat scanning with a resolution of 0.02 nm and a data acquisition interval of 0.001 nm. As can be seen from the figure, the wavelength fluctuation f (i=1,2,3,4) of the four lasers is very small, the maximum is 0.006nm, and the power fluctuation f, (i=1,2,3,4) is very low, the maximum is 0.704 dB, and the signal-to-noise ratio OSNR is all higher than 66 dB.

2.The beat spectrum measured by ESA at different scanning frequencies was measured by zero-difference method

Parameters and appearance of ATA-2021B high voltage amplifier：

• Bandwidth (-3dB)：DC~1MHz

• Voltage：200Vp-p（±100Vp）

• Current：500mAp

• Power：50Wp

• Slew rate：≥445V/us

• Number of channels：1