doing an experiment in calibrating FBG center wavelength by three methods of piecewise linear interpolation, Lagrangeinterpolation and cubic spline interpolation, the two latter methods of which have very high precision of ± 1 pm~ ± 3 pm and stability.
The features of this device are 1550.006nm center wavelength, 88.598%max drop efficiency, 0.146nm 3dB bandwidth, -13.19dB return loss and 0.36dB total loss. In addition, this device used as ODM and OAM is tested respectively.
The experiments for fabrication of fiber Bragg gratings(FBG) on hydrogen loaded commercial communication fibers by monitoring a 3.1eV(400nm)fluorescence. The 244nm SHG:Ar? ion laser and phase mask with vibration are used to obtain the FBG with reflectivity up to 96% and 3dB bandwidth below 0.2nm at the Bragg center wavelength (λ=1550.65nm).
The testing results show within the temperature range -20-+60 ℃the center wavelength shift is less than 0.004 nm/℃ and the thermal stability is 6.75 times as without thermal stable set.
When the central wavelength of the following filter is blue shifted by 0.25 nm or red shifted by 0.05 nm with respect to the wavelength of probe signal,the WC is inverted.
It is demonstrated experimentally that the chirp degree of a 100 mm long uniform grating can be increased up to 0.5 nm/cm and its central wavelength can be independently tuned by 0.7 nm.
实验表明, 一长为10 cm 的均匀光栅其啁啾度可增加至0.5 nm /cm , 而中心波长独立可调量达0.7 nm 。
The compensation process is completed within several hundred milliseconds. The method of Poincaré sphere (PS) is applied to measure the PMD values in the experimental fiber link. The results show that the DGD decreases from 21 ps to 1.3 ps and the second PMD descends from 266 ps2 to 43.5 ps2 in central wavelength of 1560.5 nm.
3. In the study of optical stability of optical filters, it is found that the observed central wavelength shift of a filter cannot be perfectly explained by the moisture absorbed in the columnar structure of thin film and the stress between film and substrate. So this paper suggests that the temperature coefficient of refractive index of water absorbed in the columnar structure contributes to the central wavelength shift of optical filters. The suggestion and the experiment data meet well.
Changing the injection signal power, the bias current ofthe SOA and the central wavelength of the filter, and we get the differentexperimental effects of the clock signals.
1.The spectra characteristics, dispersion and time delay of the fiber Bragg grating are analyzed and simulated with coupled-mode theory. Fiber Bragg grating tuning methods are discussed. The linearly tunable FBG and chirp tunable FBG utilizing cantilever beams are introduced in detail.
Simulation result shows that bit error ratio (BER) drops down sharply with a larger wavelength or relative position inconsistency as anticipated, especially when n is smaller, and the precise of wavelength and position parametrical can be lower requested in considering of BER rise slowly when parametrical asymmetry is small, e.g. n=3, wavelength offset <20% or relative position offset <30%.
(2) The mode characteristics of the photonic crystal fibers (PCF) are investigated in detail by using the FDTD. (3) Research on effective area of photonic crystal fiber by changing the structure parameters of PCFs.
4. Laser pulses with different wavelength, peak power and initial chirp transmitting in PCFs' different dispersion regions are simulated and analyzed. The explanation to the supercontinuum generation in PCF is given.
For a center wavelength of FBG of about 1550 nm and a 40 nm shift range of its reflection wavelength, the relative error of measurement is only ± 0.001.
The wavelength of the light source is modulated at a frequency of 10?kHz, and the center wavelength is stabilized at the center of the 2ν3 band R(3) line of methane (1.65372?μm).
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.
This paper analyzes the effect of mode partition noise of laser diodes on the optical fiber transmission system.In the case of different error-rate asym- ptotic line,fluctuation level,center wavelength and optical source spectrumwidth, the transmission bit rate,distance and the corresponding power penalty are cal- culated.
In a lidar receiver system,the optical interference filters are often used to eliminate the background signal.It is very important for the narrow band interference filter to match with the central wavelength of the Q switch double frequency laser,especially for the airborne laser bathymetrical system.In our experimental system,the interference filter is placed in emitting optical path.The intensity on output light is the integration of the product of the spectrum function of the filter and the emitting s...
A simple and novel method for transforming a uniform fiber grating into a linearly chirped grating is presented. This method permits independent tuning of the chirp degree and the central wavelength of the fiber gratings. It is demonstrated experimentally that the chirp degree of a 100 mm long uniform grating can be increased up to 0.5 nm/cm and its central wavelength can be independently tuned by 0.7 nm. A transmission experiment for compensating the dispersion of a standard single mode fiber (G652) over...
报道一个简单而新颖的、能将均匀光栅改变为线性啁啾光栅的方法。此方法可对光纤光栅的啁啾度和中心波长进行独立调节。实验表明, 一长为10 cm 的均匀光栅其啁啾度可增加至0.5 nm /cm , 而中心波长独立可调量达0.7 nm 。利用这样的可调啁啾光栅在标准单模光纤(G652)中对一脉宽为25 ps的输入信号在1550 nm 窗口传输, 成功地实现100 km 的色散补偿
中心波长
center wavelength 
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