Beating signal monitoring module, terahertz wave generation device and optical signal monitoring device including the beating signal monitoring module

A terahertz wave generation device comprising:

• a beating signal generation module generating a beating signal from a first light and a second light;
• a beating signal monitoring module monitoring the beating signal;
• and
• a photo mixer module generating a terahertz wave using the beating signal,
• wherein the beating signal monitoring module comprises:
• a nonlinear unit generating an optical signal including a FWM light in response to the beating signal;
• a filter unit separating the FWM light from the optical signal;
• and
• a monitoring unit monitoring the beating signal using the FWM light.

An optical signal monitoring device comprising:

• an external optical signal input module being provided with an external optical signal from the outside;
• a reference laser generating a reference light and beating the external optical signal and the reference light to generate a beating signal;
• and
• a beating signal monitoring module monitoring the beating signal,
• wherein the beating signal monitoring module comprises:
• a nonlinear unit generating an optical signal including a FWM light in response to the beating signal;
• a filter unit separating the FWM light from the optical signal;
• and
• a monitoring unit analyzing the external optical signal using a result that the beating signal is monitored using the FWM light.