Transmission apparatus and method for confirming connection of optical fiber

Patent metadata

Field	Value
Publication number	US-2017104530-A1
Application number	US-201615274179-A
Country	US
Kind code	A1
Filing date	Sep 23, 2016
Priority date	Oct 9, 2015
Publication date	Apr 13, 2017
Grant date	—

Abstract

There is provided a transmission apparatus, which includes: a filter configured to pass an optical signal having a predetermined wavelength received via an optical fiber, a variable optical attenuator configured to attenuate a power level of the optical signal passed by the filter, a first measuring circuit configured to measure a first power of the optical signal before being passed by the filter, a second measuring circuit configured to measure a second power of the optical signal attenuated by the variable optical attenuator, a detector configured to detect a difference between the first power and the second power, and a controller configured to increase an attenuation factor of the variable optical attenuator when the difference is equal to or larger than a first predetermined value.

First claim

What is claimed is:

1 . A transmission apparatus comprising:
a filter configured to pass an optical signal having a predetermined wavelength received via an optical fiber; a variable optical attenuator configured to attenuate a power level of the optical signal passed by the filter; a first measuring circuit configured to measure a first power of the optical signal before being passed by the filter; a second measuring circuit configured to measure a second power of the optical signal attenuated by the variable optical attenuator; a detector configured to detect a difference between the first power and the second power; and a controller configured to increase an attenuation factor of the variable optical attenuator when the difference is equal to or larger than a first predetermined value.

2 . The transmission apparatus according to claim 1 , wherein, when the difference is smaller than the first predetermined value, the controller controls the attenuation factor such that the second power becomes to a first predetermined amount.

3 . The transmission apparatus according claim 1 ,
wherein the detector detects a ratio of the second power to the first power, and wherein the controller increases the attenuation factor when the ratio is equal to or smaller than a second predetermined value.

4 . The transmission apparatus according to claim 3 , wherein, when the ratio is larger than the second predetermined value, the controller controls the attenuation factor such that the second power becomes to a second predetermined amount.

5 . A method for confirming connection of an optical fiber, the method comprising:
passing an optical signal having a predetermined wavelength received via the optical fiber, by a filter; attenuating a power level of the optical signal passed by the filter, by a variable optical attenuator; measuring a first power of the optical signal before being passed by the filter; measuring a second power of the optical signal after being attenuated by the variable optical attenuator; detecting a difference between the first power and the second power, by a detector; and increasing an attenuation factor of the variable optical attenuator when the difference is equal to or larger than a first predetermined value, by a controller.

6 . The method according to claim 5 , wherein, when the difference is smaller than the first predetermined value, the controller controls the attenuation factor such that the second power becomes to a first predetermined amount.

7 . The method according to claim 5 wherein the detector detects a ratio of the second power to the first power, and wherein controller increases the attenuation factor when the ratio is equal to or smaller than a second predetermined value.

8 . The method according to claim 7 , wherein, when the ratio is larger than the second predetermined value, the controller controls the attenuation factor such that the second power becomes to a second predetermined amount.

Assignees

• Fujitsu Ltd

Inventors

• Nagata Hiroki
• Eiro Masanori
• Kobayashi Daisuke
• Nagayoshi Tatsuo

Classifications

• H04B10/07955 Primary

  Monitoring or measuring power · CPC title

• H04B10/0777

  Monitoring line amplifier or line repeater equipment · CPC title

• H04B10/58

  Compensation for non-linear transmitter output · CPC title

• H04J14/021

  Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM] · CPC title

• H04B10/2504

  Electricity · mapped topic