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US 6,788,396 B2Granted
Determination of optical properties of a device under test in transmission and in reflection
AssigneeAgilent Technologies, Inc.
InventorsRalf Stolte, Patrick Ziegler
Life of this patent
Estimating the term…
Abstract
The present invention relates to determination of optical properties, e.g. polarization dependent loss (PDL), polarization mode dispersion (PMD), differential group delay (DGD), insertion loss, return loss and/or chromatic dispersion (CD), of a device under test (DUT) in transmission and in reflection of an optical beam. The invention is disclosing an element that is at least partly transmissive and at least partly reflective.
Claims10
An apparatus, comprising:
- a coupler that receives light propagating along an initial path in a forward direction, and couples out (a) a first portion of said light into a first path, and (b) a second portion of said light into a second path;
- and
- an optical guide that receives said first portion, produces a third portion of said light from said first portion, and guides said third portion into said initial path in a reverse direction.
A system, comprising:
- a measurement arm to receive a device under test (DUT);
- a transmission detector in optical contact to the measurement arm to detect a signal transmitted by said DUT;
- a reflection detector in optical contact with said measurement arm to detect a signal reflected by said DUT;
- a reference arm in optical contact with said transmission detector to provide a transmission reference signal to said transmission detector;
- and
- an apparatus, situated in said reference arm, in optical contact with said reflection detector to provide a reflection reference signal to said reflection detector, and a transmission reference to said transmission detector.
3 more elements
An apparatus, comprising:
- a coupler that receives light propagating along an initial path in a forward direction, and couples out (a) a first portion of said optical light into a first path, and (b) a second portion of said light into a second path;
- and
- a mirror that reflects said first portion back to said coupler,
- wherein said coupler produces a third portion of said light from said reflected first portion and couples said third portion into said initial path in a reverse direction.
1 more element
A method comprising:
- receiving reference light that is propagating along a reference path in a forward direction;
- transmitting a first portion of said reference light as a transmission reference;
- returning a second portion of said reference light to said reference path, in a reverse direction, as a reflection reference;
- employing said transmission reference and said reflection reference in an operation that yields data relating to transmission of light through a device under test (DUT) and reflection of light from said DUT;
- and
- analyzing said data to determine an optical property of said DUT.
3 more elements
A data carrier, comprising:
- a program for controlling a processor to analyze data to determine an optical property of a device under test DUT,
- wherein said data relates to transmission of light through said DUT and reflection of light from said DUT and is obtained during a measurement that employs a transmission reference and a reflection reference, and
- wherein said transmission reference and said reflection reference are provided by an apparatus that receives reference light that is propagating along a reference path in a forward direction, transmits a first portion of said reference light as said transmission reference, and returns a second portion of said reference light to said reference path, in a reverse direction, as said reflection reference.
Dependencies are inferred from the claim text.