Title:
波長掃引光源
Document Type and Number:
Japanese Patent JP6748630
Kind Code:
B2
Abstract:
To provide a wavelength sweeping light source realizing stable FDML operation by controlling the sweep frequency of a wavelength selector according to resonator length change.SOLUTION: A beam sampler 251 divides a part of the light entering from the fiber ring side, and a part of the light entering from the grating 234 and the optical deflector 233 side, and the divided light permeates a bandpass filter 254 and enters photodetectors 255, 256. When the difference Δt of peak time becomes smaller than a reference value (when the reference value is zero, Δt<0), it means that the optical length of the fiber ring becomes short and the circulation cycle has been shortened, and thereby the wavelength sweeping frequency fis increased so that the Δt becomes zero. Meanwhile, when the phase difference Δt becomes larger than a reference value (when the reference value is zero, Δt>0), it means that the optical length of the fiber ring becomes long and the circulation cycle has been lengthened, and thereby the wavelength sweeping frequency fis decreased so that the Δt becomes zero.SELECTED DRAWING: Figure 2
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Inventors:
Masahiro Ueno
Chen Akira
Seiji Toyota
Tadashi Sakamoto
Chen Akira
Seiji Toyota
Tadashi Sakamoto
Application Number:
JP2017248382A
Publication Date:
September 02, 2020
Filing Date:
December 25, 2017
Export Citation:
Assignee:
Nippon Telegraph and Telephone Corporation
International Classes:
H01S3/137; G02F1/29; H01S3/10; H01S3/107
Domestic Patent References:
| JP7263786A | ||||
| JP7288359A | ||||
| JP2002094155A | ||||
| JP2010225688A | ||||
| JP2014126599A |
Attorney, Agent or Firm:
Patent Business Corporation Tani/Abe Patent Office