Single sweep measurement of multiple optical characteristics
AssigneeTektronix, Inc.
InventorDuwayne R. Anderson
Life of this patent
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Abstract
A method of measuring multiple optical characteristics of an optical device during a single sweep of a swept wavelength optical system cyclically changes an input state of polarization on consecutive optical frequency increments of an optical signal within the wavelength range of the swept wavelength optical system. From the measured output states of polarization a wavelength-dependent Jones matrix is calculated, and from the Jones matrix the multiple optical characteristics are determined, which characteristics may include PDL and DGD.
Claims13
A method of measuring multiple optical characteristics of an optical device comprising the steps of:
- applying a swept-wavelength optical signal to an input of the optical device, the swept-wavelength optical signal having a state of polarization that changes for each change in optical frequency over a range of wavelengths of the swept-wavelength optical signal, the state of polarization varying cyclically among a plurality of defined states of polarization;
- measuring a state of polarization at an output of the optical device to generate a Jones vector for each change in optical frequency;
- and
- calculating the multiple optical characteristics from the Jones vectors generated from a single sweep of the swept-wavelength optical signal over the range of wavelengths.
A system for determining multiple optical characteristics of an optical device comprising:
- an optical source that outputs a swept-wavelength optical signal;
- means for cyclically changing an input state of polarization of the swept-wavelength optical signal for each change to produce an input optical signal for application to the optical device, the input state of polarization cycling between a plurality of defined states of polarization;
- means for measuring an output state of polarization from an optical signal output by the optical device in response to the input optical signal at each change of optical frequency;
- and
- means for calculating the multiple optical characteristics from the output states of polarization measured over a single sweep of the swept-wavelength optical signal.
Dependencies are inferred from the claim text.