An improved demodulation system for fiber Bragg grating(FBG) sensors based on the wavelength pumped multiplexing(WPM) filter is presented.Double photoelectric measurement channels are exploited to compensate the surro...An improved demodulation system for fiber Bragg grating(FBG) sensors based on the wavelength pumped multiplexing(WPM) filter is presented.Double photoelectric measurement channels are exploited to compensate the surrounding and light source interference including temperature influence.Temperature testing is employed to prove the demodulation system capacity and characteristics.The digital thermometer and one free FBG are simultaneously introduced in the constant-temperature water tank for the comparison study.The results show that the demodulation scheme can measure temperature with a high resolution,stability and reliability.Its sensitivity of temperature measurement can reach 0.05 oC in repeated testing.展开更多
A 32-channel 50 GHz spaced arrayed-waveguide grating(AWG) with our innovative configuration has been designed and fabricated.The performance of the device has been fully tested by using a system that consists of a tun...A 32-channel 50 GHz spaced arrayed-waveguide grating(AWG) with our innovative configuration has been designed and fabricated.The performance of the device has been fully tested by using a system that consists of a tunable laser light source (TLS), an optical power meter and a polarization controller.The insertion loss (IS) of the device is 4.2-7.4 dB.The crosstalk is about -28 dB.The IS uniformity is less than 3.3 dB.With our configuration,the performance of the device has been enhanced effectively and the difficulty in alignment process has been decreased obviously.展开更多
A plastic surface-relief grating as a wavelength division multiplexer is designed and fabricated with the conventional mould pressing technique using the transmission-type fused quartz phase grating as mask pattern an...A plastic surface-relief grating as a wavelength division multiplexer is designed and fabricated with the conventional mould pressing technique using the transmission-type fused quartz phase grating as mask pattern and polycarbonate as basal material.The experiment results show that in an optimizing process,the plastic surface-relief grating has the highest firstorder diffraction efficiency under adequate groove depth and incident angle,and can be used as the best optical path for wavelength division multiplexing(WDM).We also establish the experiment setup for testing the WDM performance of the plastic surface-relief grating based wavelength division multiplexer.The results show that the proposed wavelength division multiplexer has the high-stability temperature characteristics,the low insertion loss of less than 5 dB,the large isolation of greater than 20 dB,the low polarization-dependent loss(PDL) of less than 0.4 dB and the relatively steep pass-band characteristics.It is a WDM device with good performance,which can be applied in short distance communication.展开更多
基金supported by the Natural Science Foundation of Shandong Province (No. Q2007F06)the Independent Innovation Foundationof Shandong University (No. 2009TS044)
文摘An improved demodulation system for fiber Bragg grating(FBG) sensors based on the wavelength pumped multiplexing(WPM) filter is presented.Double photoelectric measurement channels are exploited to compensate the surrounding and light source interference including temperature influence.Temperature testing is employed to prove the demodulation system capacity and characteristics.The digital thermometer and one free FBG are simultaneously introduced in the constant-temperature water tank for the comparison study.The results show that the demodulation scheme can measure temperature with a high resolution,stability and reliability.Its sensitivity of temperature measurement can reach 0.05 oC in repeated testing.
基金Project supported by Nation Key Basic R&D Plan of China(G2000036602) ,and the National Natural Science Foundation ofChina(No.69889701)
文摘A 32-channel 50 GHz spaced arrayed-waveguide grating(AWG) with our innovative configuration has been designed and fabricated.The performance of the device has been fully tested by using a system that consists of a tunable laser light source (TLS), an optical power meter and a polarization controller.The insertion loss (IS) of the device is 4.2-7.4 dB.The crosstalk is about -28 dB.The IS uniformity is less than 3.3 dB.With our configuration,the performance of the device has been enhanced effectively and the difficulty in alignment process has been decreased obviously.
基金supported by the Natural Science Foundation of Fujian Province of China (No.2011J01353)
文摘A plastic surface-relief grating as a wavelength division multiplexer is designed and fabricated with the conventional mould pressing technique using the transmission-type fused quartz phase grating as mask pattern and polycarbonate as basal material.The experiment results show that in an optimizing process,the plastic surface-relief grating has the highest firstorder diffraction efficiency under adequate groove depth and incident angle,and can be used as the best optical path for wavelength division multiplexing(WDM).We also establish the experiment setup for testing the WDM performance of the plastic surface-relief grating based wavelength division multiplexer.The results show that the proposed wavelength division multiplexer has the high-stability temperature characteristics,the low insertion loss of less than 5 dB,the large isolation of greater than 20 dB,the low polarization-dependent loss(PDL) of less than 0.4 dB and the relatively steep pass-band characteristics.It is a WDM device with good performance,which can be applied in short distance communication.
