Title:
【発明の名称】信号光モニタとこれを用いた光増幅器
Document Type and Number:
Japanese Patent JP3075200
Kind Code:
B2
Abstract:
A signal light monitor having a first optical branching coupler disposed in an optical fiber transmission line for branching a part of an inputted signal light and outputting a first branched light, a first wavelength tunable filter for transmitting a first particular wavelength component included in the first branched light and outputting a transmitted light and a first sweeper for sweeping a transmission center wavelength of the first wavelength tunable filter within a range of the first particular wavelength component. The transmitted light outputted from the wavelength tunable filter is received by a first optical receiver and converted into an electric signal and sampled by a first sampling device. The first sampling data is stored in a first storage device. A waveform of electric signal from optical receiver is stored in the first storage device as a series of data. Based on the stored sampling data, an arithmetic processing section detect an existence of light signal identifying a steep change in the waveform. The arithmetic processing section detects a level of light signalfrom a peak of the steep change and wavelength of signal light from the time difference between a time when the sweep of the wavelength tunable filter is started and a time when a peak level of the detected steep change is detected. The arithmetic processing section detects noise light level near signal light from the first waveform and calculates signal-to-noise ratio from the detected signal light level and the detected noise light level.
More Like This:
| JPS55140813 | OPTICAL BRANCHING FILTER |
| JPH09101429 | OPTICAL COUPLER MODULE |
Inventors:
Masayuki Fujita
Miwa Saeki
Miwa Saeki
Application Number:
JP32980196A
Publication Date:
August 07, 2000
Filing Date:
December 10, 1996
Export Citation:
Assignee:
NEC
International Classes:
G02B6/293; H01S3/06; H01S3/067; H01S3/10; H01S5/0683; H04B10/07; H04B10/079; H04B10/294; H04J14/00; H04J14/02; H01S5/50; (IPC1-7): H01S3/10; H04B10/08; H04J14/00; H04J14/02
Domestic Patent References:
| JP964819A | ||||
| JP8139672A | ||||
| JP7202811A |
Attorney, Agent or Firm:
Naoki Kyomoto (2 outside)