In this study, the V –I transmission matrix formalism(V –I method) is proposed to analyze the spectrum characteristics of the uniform fiber Bragg grating(FBG)-based acousto–optic modulators(UFBG-AOM). The simulatio...In this study, the V –I transmission matrix formalism(V –I method) is proposed to analyze the spectrum characteristics of the uniform fiber Bragg grating(FBG)-based acousto–optic modulators(UFBG-AOM). The simulation results demonstrate that both the amplitude of the acoustically induced strain and the frequency of the acoustic wave(AW) have an effect on the spectrum. Additionally, the wavelength spacing between the primary reflectivity peak and the secondary reflectivity peak is proportional to the acoustic frequency with the ratio 0.1425 nm/MHz. Meanwhile, we compare the amount of calculation. For the FBG whose period is M, the calculation of the V –I method is 4 ×(2M-1) in addition/subtraction,8 ×(2M- 1) in multiply/division and 2M in exponent arithmetic, which is almost a quarter of the multi-film method and transfer matrix(TM) method. The detailed analysis indicates that, compared with the conventional multi-film method and transfer matrix(TM) method, the V –I method is faster and less complex.展开更多
A high sensitivity magnetic fluid(MF) filled side-hole fiber magnetic field sensor based on surface plasmon resonance(SPR) is designed and investigated.Within the side-hole fiber,the water-based MF is injected into th...A high sensitivity magnetic fluid(MF) filled side-hole fiber magnetic field sensor based on surface plasmon resonance(SPR) is designed and investigated.Within the side-hole fiber,the water-based MF is injected into the two side holes,and both of the holes are coated with gold to realize the measurement of the magnetic field by using the SPR effect.The refractive index of the MF changes with different external magnetic fields,resulting in the resonant wavelength moving to other wavelengths.Furthermore,when the external magnetic field increases from 30 to 210.9 Oe,the magnetic field sensitivity can reach to 1.063 nm/Oe.展开更多
In a D-shaped twin-core fiber(DTCF),the central core is insensitive to the variation of the external environment,while the other core is highly sensitive.As an electro-optic polymer coated on a DTCF,the coupling betwe...In a D-shaped twin-core fiber(DTCF),the central core is insensitive to the variation of the external environment,while the other core is highly sensitive.As an electro-optic polymer coated on a DTCF,the coupling between the two cores varies with voltages applied to the polymer.Based on this,a superior all-fiber modulator is proposed that bears little coupling loss,prohibits mode mismatch,and provides a more stable working circumstance.A half-wave driving voltage(V_π)of 1.26 V is achieved.Moreover,a high modulation depth of 40 dB can be realized for a voltage of 2.7 V at a 1550 nm wavelength.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.61275076)
文摘In this study, the V –I transmission matrix formalism(V –I method) is proposed to analyze the spectrum characteristics of the uniform fiber Bragg grating(FBG)-based acousto–optic modulators(UFBG-AOM). The simulation results demonstrate that both the amplitude of the acoustically induced strain and the frequency of the acoustic wave(AW) have an effect on the spectrum. Additionally, the wavelength spacing between the primary reflectivity peak and the secondary reflectivity peak is proportional to the acoustic frequency with the ratio 0.1425 nm/MHz. Meanwhile, we compare the amount of calculation. For the FBG whose period is M, the calculation of the V –I method is 4 ×(2M-1) in addition/subtraction,8 ×(2M- 1) in multiply/division and 2M in exponent arithmetic, which is almost a quarter of the multi-film method and transfer matrix(TM) method. The detailed analysis indicates that, compared with the conventional multi-film method and transfer matrix(TM) method, the V –I method is faster and less complex.
基金supported by the National Natural Science Foundation of China under Grant No.61525501
文摘A high sensitivity magnetic fluid(MF) filled side-hole fiber magnetic field sensor based on surface plasmon resonance(SPR) is designed and investigated.Within the side-hole fiber,the water-based MF is injected into the two side holes,and both of the holes are coated with gold to realize the measurement of the magnetic field by using the SPR effect.The refractive index of the MF changes with different external magnetic fields,resulting in the resonant wavelength moving to other wavelengths.Furthermore,when the external magnetic field increases from 30 to 210.9 Oe,the magnetic field sensitivity can reach to 1.063 nm/Oe.
基金financially supported by the National Natural Science Foundation of China under Grant No.61525501
文摘In a D-shaped twin-core fiber(DTCF),the central core is insensitive to the variation of the external environment,while the other core is highly sensitive.As an electro-optic polymer coated on a DTCF,the coupling between the two cores varies with voltages applied to the polymer.Based on this,a superior all-fiber modulator is proposed that bears little coupling loss,prohibits mode mismatch,and provides a more stable working circumstance.A half-wave driving voltage(V_π)of 1.26 V is achieved.Moreover,a high modulation depth of 40 dB can be realized for a voltage of 2.7 V at a 1550 nm wavelength.
