Fiber grating bandwidth tuning method

• Main Authors: SUI QINGMEI, WANG JING, LU MINGSHUANG, JIANG MINGSHUN, FENG DEJUN, YANG DONGZHOU
• Format: Patent
• Language: Chinese; English
• Published: 30.09.2009
• Subjects: ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS; DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; FREQUENCY-CHANGING; MEASURING; MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; TARIFF METERING APPARATUS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; TESTING

The invention relates to a fiber grating bandwidth tuning method belonging to the technical field of optical fiber sensing and optic fiber communication. An optical fiber connector welded with one end of a fiber grating is connected with a coupler and a spectroanalysis instrument or a demodulator. Movement amount and direction of a moving platform are determined on a human-computer interaction interface on a PC computer. Then, a stepping motor drives a precision screw mandrel to rotate so as to push a flange and the moving platform to move on a horizontal sliding rod without swinging. During the movement of the moving platform, the upward-bending degree of an elastic rod does not change. As the strain distribution generated by the bending does not change, a difference between the maximum strain and the minimum strain which are suffered by the grating area changes so as to realize the bandwidth tuning of a fiber grating reflectance spectrum. The method achieves high precision, can overcome the defects resulted