Key features of the AQ6377 optical spectrum analyzer include gas purging input ports/output ports, a built-in cut filter for high order diffracted light​​​​​​, and a novel double speed mode which increases the sweep speed up to 2 times compared to the standard sweep mode.

Features:

Wavelength range: 1900 to 5500 nm 
Wavelength resolution settings: 0.2 to 5 nm 
Wavelength accuracy: ±0.5 nm 
Level range: −60 to +13 dBm 
Dynamic range: 50 dB