GHz Nirvana Receiver

Newport - New Focus

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New Focus, a Newport Corp. brand, introduces the GHz Nirvana high-speed receiver, a photoreceiver with automatic signal balancing.

It features high bandwidth and fiber coupling. The patent-pending autobalance feature eliminates background noise from dynamically changing systems, including thermal drift and wavelength dependence, yielding perfect power balance between the reference and signal beams. It also eliminates the need to optically balance the detectors, simplifying optical and electrical alignment. The user can also balance in optical and manual modes, if desired.

The autobalance feature and variable gain increase the receiver’s flexibility and ease of use, and enable the user to adjust the detector instead of having to adjust components such as the optics, lasers and samples used in an application. While manually balanced and autobalanced modes can produce similar results for slow changes in split ratio, the autobalance feature enables measurement systems that can accommodate drift over time.

The photoreceiver has an operating wavelength range of 900 to 1650 nm and can cut the effects of laser noise by 25 dB, making even small signals easy to see. Rise time is <1 ns, and peak responsivity is 30,000 A/W.

The receiver is suitable for use in commercial systems where easy assembly and reliable performance over time and temperature are critical. It also improves the performance of swept-source optical coherence tomography using both high-speed balanced and autobalanced detection. In this application, the balanced detection allows subtraction of all common-mode noise and improves the ability to resolve low-scattering features deep in the sample.

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Published: July 2011