Title:
波長掃引光源
Document Type and Number:
Japanese Patent JP6831773
Kind Code:
B2
Abstract:
To provide a wavelength sweeping light source realizing stable FDML operation by controlling the optical path length of a resonator according to resonator length change.SOLUTION: Reference light outputted from a laser light source 151 is reflected on a dichroic mirror 155 and inputted from a fiber collimator 132 to a fiber ring. The reference light around the fiber ring is reflected on the dichroic mirror 155, and then reflected on a polarization beam splitter 153 before incident to a photodetector 156. When the optical path length of the fiber ring, including a light delay fiber 170, changes due to temperature change, phase difference Δφ changes. When the phase difference Δφ is negative (Δφ<0), the circulation cycle has been shortened, and it is lengthened by elongating the optical path length of a fiber stretcher 180 so that the Δφ becomes zero. Meanwhile, when the phase difference Δφ is positive (Δφ>0), the circulation cycle has been lengthened, and the optical path length of the fiber stretcher 180 shortened so that the Δφ becomes zero.SELECTED DRAWING: Figure 1
Inventors:
Seiji Toyota
Masahiro Ueno
Chen Akira
Tadashi Sakamoto
Masahiro Ueno
Chen Akira
Tadashi Sakamoto
Application Number:
JP2017248378A
Publication Date:
February 17, 2021
Filing Date:
December 25, 2017
Export Citation:
Assignee:
Nippon Telegraph and Telephone Corporation
International Classes:
H01S3/137; G01J9/00; G02F1/29; H01S3/107
Domestic Patent References:
| JP2010225688A | ||||
| JP7288359A | ||||
| JP2014126599A |
Foreign References:
| US6643299 |
Attorney, Agent or Firm:
Patent Business Corporation Tani/Abe Patent Office