This specification describes and defines GouMax’s OSA devices with applications to test and measurement equipment. The OSA product is designed and produced using GouMax’s proprietary micro-optics and tunable technology. It measures optical spectrum of optical signals injected into the OSA device over the defined operating wavelength range. From the measured spectrum, critical channel parameters, such as channel power, wavelength, or OSNR, can be analyzed. GouMax OSA-family products support various zones of wavelength range, such as C-band, L-band, O-Band, S-Band, C+L-band, full band from 1050 nm to 1650 nm and any other customer specified wavelength range.

GouMax’s OSA module consists of a bandpass tunable optical filter, a photodetector and low noise, high-dynamic range electronics, as schematically shown in Figure 1-1. When a wide band spectrum is incident to the tunable filter, it allows a narrow band of input light centered at a given wavelength to pass through the filter. By altering the central wavelength of pass band of the tunable filter, the whole input spectrum can be scanned and spectrum information of incident signal is detected sequentially. The photodetector converts the light passing through the filter into electrical current that is then digitized. The data processing unit analyzes the data and then outputs the spectrum to the customers.