Characteristic of fiber optics and semiconductor laser
Experiment contents and related subjects:
Cutting and end treatment of fiber .
Coupling of fiber with laser and the measurement of coupling efficiency
Electro-optical characteristics of semiconductor laser (threshold current and gain slop).
 Observe the pattern and polarization of the fiber, the effect onmodes caused by fiber bending(interference modes).
Determination of the speed of light in fiber and calculation of the average refractive index of the fiber materials.
Modulation, emission, fiber transmission, receiver amplification and demodulation  (communication theory) of the analog signal (audio).
 Features of the instruments
Using the visible light semiconductor laser which can be modulated as light source, the phenomenon is clear and intuitive, the wavelength is 650nm, the output power is ≥10 mW and the power stability is ≤ ± 1%; the frequency modulation range is 10K-200KHz; the laser power meter is three and a half digital meter, the measuring ranges are 200μW, 2mW, 20mW, 200mW and the tunable range ;the length of the fiber is 200m.
Precise adjustment mechanism of multi-degrees  of freedom is employed  to couple fiber ,so ,hands on  abilities of students  are cultured.
 Complete set of equipment
Optics experiment guide, optical fiber test device, semiconductor laser, fiber coupler, fiber seats, fiber ,polarizer, laser power indicator, fiber knife, skinning pliers, one- dimensional displacement of the probe light aircraft +12 steps light detector(optional) , audio signal source ,oscilloscope (dual trace 20MHz, self-contain) and etc.