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US 11,343,010 B2Granted
Polarization-dependent loss determining method, detection system, and optical signal transmission structure
AssigneeHuawei Technologies Co., Ltd.
InventorsWei Jia, Liangjia Zong, Bing Zou, Lei Mao, Chao Pan
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Abstract
A polarization-dependent loss (PDL) determining method includes obtaining two groups of optical powers within first duration, selecting at least one group of target optical powers that satisfy a same power constraint from the two groups of optical powers, where each group of target optical powers includes a first target power and a second target power from the two groups of optical powers, and determining a PDL of the optical device based on the at least one group of target optical powers.
Claims21
A method applied to a detection system comprising an optical device, wherein the method comprises:
- obtaining two groups of optical powers within a first duration, wherein an optical power satisfying a power constraint exists in each of the two groups of optical powers, wherein the two groups of optical powers are either optical-path output powers of two polarization principal axes of the optical device, wherein obtaining the two groups of optical powers comprises:
- splitting a first optical signal into a first polarization signal and a second polarization signal, wherein a first polarization direction of the first polarization signal and a second polarization direction of the second polarization signal are perpendicular;
- converting the first polarization signal to obtain a third polarization signal, wherein a third polarization direction of the third polarization signal and the second polarization direction are the same;
- detecting, within the first duration, a first output power of a first signal with an energy proportion in the third polarization signal;
- and
- detecting, within the first duration, a second output power of a second signal with the energy proportion in the second polarization signal, and
- wherein the optical-path output powers are the first output power and the second output power;
- selecting, from the two groups of optical powers, at least one group of target optical powers that satisfy the power constraint, wherein each of the at least one group of target optical powers comprises a first target power and a second target power;
- and
- determining a polarization-dependent loss (PDL) of the optical device based on the at least one group of target optical powers.
7 more elements
A detection system comprising:
- an optical device comprising:
- a polarization processing apparatus configured to split a first optical signal into a first polarization signal and a second polarization signal, wherein a first polarization direction of the first polarization signal and a second polarization direction of the second polarization signal are perpendicular;
- and
- a conversion component coupled to the polarization processing apparatus and configured to convert the first polarization signal to obtain a third polarization signal, wherein a polarization direction of the third polarization signal and the second polarization direction are the same;
- an optical power detector coupled to the optical device and configured to:
- detect optical powers;
- detect, within a first duration, a first output power of a first signal with an energy proportion in the third polarization signal;
- and
- detect, within the first duration a second output power of a second signal with the energy proportion in the second polarization signal, wherein optical-path output powers of two polarization principal axes of the optical device are the first output power and the second output power;
- and
- a controller coupled to the optical power detector and configured to:
- obtain two groups of optical powers within the first duration from the optical powers, wherein an optical power satisfying a power constraint exists in each of the two groups of optical powers, wherein the two groups of optical powers are the optical-path output powers;
- select, from the two groups of optical powers, at least one group of target optical powers that satisfy the power constraint, wherein each of the at least one group of target optical powers comprises a first target power and a second target power;
- and
- determine a polarization-dependent loss (PDL) of the optical device based on the at least one group of target optical powers.
12 more elements
Dependencies are inferred from the claim text.