Characteristics of superradiance light emitting diode(SLD) are introduced and the effects on the performance of a fiber optic gyro(FOG) such as output power,central wavelength,full width at half maximum(FWHM),degree of polarization(DOP),input current of the SLD are analyzed from the point of view of theory and application,methods to solve these problems are given also.
With the single-pass backward-signal structure,a 980nm diode laser pumping Er~(3+)-doped super-fluorescent fiber source is manufactured,which is characterized by the output power over 5mW,the central wavelength of 1544nm,3dB bandwidth of 41nm and the spectrum flatness without over ±1dB.
A proposal of simultaneous measurement of strain and temperature distributions in smart structures using fiber gratings and Raman scattering is presented. The temperature only dependent Raman scattering can uncouple the dual dependence of the reflection central wavelength shift of fiber Bragg gratings on strain and temperature. Spatial resolution matching between Raman scattering systems and fiber Bragg gratings is theoretically analyzed in detail.
A systematic analysis of transfer characteristics of MZ-IFOG is made. Performance-limiting factors, including the path-length difference, the disturbance of temperature fluctuation and stress from working environment, the quality of light source, are all discussed along with methods to reduce their effect on the output signal.
This thesis describes a all fiber optic accelerometer based on T-G double beam interferometer,the whole system include a coherent source whose wavelength is 1310nm, a flexural optic fiber disk act as sensing unit, photodetector,piezoelectric ceramic act as a phase modulator and signal processing circuit.
Variations in the intensity of the solar radiation are measured in the six spectral intervals of the multi-channel photometer: 350, 500, 650, 850, 1100, and 1500 nm, with the bandwidths being about 10% of the central wavelength of each interval.
The RATAN-600 Zenith Field (RZF) catalog was obtained at the central wavelength of 7.6 cm, and contains 437 radio sources, virtually all of which have been identified with NVSS objects.
This effect reduces unwanted variations in the central wavelength, as well as fluctuations of the delay time of the frequency-shifted soliton with respect to the input pulse.
By slightly tuning the central wavelength of the narrowband FBG, SLM lasing at 1549.658 or 1549.563 nm (corresponding to the two transmission peaks of the FBG-FPF) is achieved with a laser output power of ~4 mW, when the pump power is ~75 mW.
A proposal of simultaneous measurement of strain and temperature distributions in smart structures using fiber gratings and Raman scattering is presented. The temperature only dependent Raman scattering can uncouple the dual dependence of the reflection central wavelength shift of fiber Bragg gratings on strain and temperature. Spatial resolution matching between Raman scattering systems and fiber Bragg gratings is theoretically analyzed in detail.
The optical system is an important part of star sensors. Proper parameters of the optical system will not only insure the star sensor to achieve the expected performance, but also be helpful to reduce the cost of R&D. This paper describes a new method to select these parameters, including to determine the focus length, relative aperture and Field of View of new optical system in design by means of making reference to previous star sensors and their optical systems; to forecast the acquiring probability of s...
For high precision fiber optic gyroscope application,high performance Er-doped superfluorescent fiber source was demonstrated and a practical prototype with 2.58×10~(-6)℃ mean wavelength stability and less than 1% output power instability within-40℃~+60℃ was made with a cut-off type thin film filter which reflect long wavelength light within 1?550?nm band and the optimal parameters obtained by simulating.The source relative intensity noise was measured and analysed.A close loop all digital fiber optic gyros...