optical communications

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Mission Impossible? Measuring Signals Below the Noise Floor with a Lock-In Amplifier

Measuring optical signals in the femtowatt (10-15) to nanowatt (10-9) range can be a daunting task. In order to achieve significant improvements in noise rejection we need to turn to a lock-in amplifier, which can improve noise rejection by 3 orders of magnitude or more.

ANALYSIS & OPINION

Photonics in orbit

Matthew Dale takes a look at some of the space technologies presented at Laser World of Photonics, including lidar for global methane analysis and laser communication technology