US 12,470,291 B2
Fault detection method for optical switching apparatus, network device, and system
Yun Long, Wuhan (CN); Zhiwen Chang, Dongguan (CN); and Fan Ai, Wuhan (CN)
Assigned to HUAWEI TECHNOLOGIES CO., LTD., Shenzhen (CN)
Filed by HUAWEI TECHNOLOGIES CO., LTD., Guangdong (CN)
Filed on Jan. 13, 2023, as Appl. No. 18/154,227.
Application 18/154,227 is a continuation of application No. PCT/CN2021/103947, filed on Jul. 1, 2021.
Claims priority of application No. 202010692070.3 (CN), filed on Jul. 17, 2020.
Prior Publication US 2023/0224033 A1, Jul. 13, 2023
Int. Cl. H04B 10/07 (2013.01); H04B 10/077 (2013.01)
CPC H04B 10/0771 (2013.01) [H04B 10/0777 (2013.01)] 20 Claims
OG exemplary drawing
 
19. A fault detection system, comprising:
a target path having a probe unit and at least one optical switching apparatus, wherein the probe unit is connected to the at least one optical switching apparatus by using an optical fiber, and
the probe unit is configured to:
send a probe optical signal to the target path;
receive a plurality of reflected optical signals from the target path, wherein the plurality of reflected optical signals are formed after the probe optical signal is reflected by the target path;
determine a target reflected optical signal in the plurality of reflected optical signals; and
determine, based on the target reflected optical signal, whether the optical switching apparatus is faulty, wherein the probe unit is further caused to:
obtain a reflection spectrum that includes a correspondence between an amplitude and a distance of any one of the plurality of reflected optical signals, and the distance of the any one of the plurality of reflected optical signals indicates a distance between a reflection point on the target path configured to reflect the any one of the plurality of reflected optical signals and the probe unit; and
determine the target reflected optical signal in the reflection spectrum, and wherein the probe unit is further caused to:
obtain a plurality of reflection spectra, wherein different reflection spectra, from the plurality of reflection spectra, are generated based on different probe optical signals;
determine whether there is a target reflected optical signal satisfying a fault condition, wherein the fault condition includes an absolute value of a difference between amplitudes corresponding to target reflected optical signals located at a same position in the plurality of reflection spectra being greater than or equal to a first preset value; and
determine that the optical switching apparatus is faulty based on the target reflected optical signal satisfying the fault condition.