A balanced photoreceiver consists of two well-matched photodetectors so that a small signal not subtracted is amplified. Balanced Photoreceivers are especially useful in applications such as absorption spectroscopy, or heterodyne detection anywhere you have a weak signal and need to cancel out residual intensity noise. Specifically, Nirvana, ideal for OCT and interferometric measurements, is designed to eliminate the problems associated with manually balancing the reference and signal beams. It has a built-in low-frequency feedback loop that auto-balance between signal and reference arms.
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