title: Optical-Fiber Power Meter Comparison Between NIST and PTB.
abstract: We describe the results of a comparison of reference standards between the National Institute of Standards and Technology (NIST-USA) and Physikalisch-Technische Bundesanstalt (PTB-Germany) at nominal wavelengths of 1300 nm and 1550 nm using an optical-fiber cable. Both laboratories used thermal detectors as reference standards. A novel temperature-controlled, optical-trap detector was used as a transfer standard to compare two reference standards. Measurement results showed differences of less than 1.5 × 10(-3), which is within the combined uncertainty for both laboratories.
authors.affiliation: National Institute of Standards and Technology, Boulder, CO 80305 USA.
authors.forename: I
authors.initials: I
authors.lastname: Vayshenker
authors.affiliation: Applied Radiometry Section, Physikalisch-Technische Bundesanstalt, Braunschweig, Germany.
authors.forename: H
authors.initials: H
authors.lastname: Haars
authors.affiliation: National Institute of Standards and Technology, Boulder, CO 80305 USA.
authors.forename: X
authors.initials: X
authors.lastname: Li
authors.affiliation: National Institute of Standards and Technology, Boulder, CO 80305 USA.
authors.forename: J H
authors.initials: JH
authors.lastname: Lehman
authors.affiliation: National Institute of Standards and Technology, Boulder, CO 80305 USA.
authors.forename: D J
authors.initials: DJ
authors.lastname: Livigni
keywords: calibration; cryogenic radiometer; fiber; international comparison; optical fiber; optical power meter; uncertainty