Multi-wavelength fiber laser has received more and more attention due to its high quality output laser, good heat dissipation, compact structure, strong resistance to electromagnetic interference. The key of multi-wavelength fiber laser is the suppression of mode competition. In this paper, multi-wavelength fiber laser mode competition suppression technologies have been studied and analyzed.
With the development of optical fiber communication, and after chromatic dispersion and attenuation are compensated
for, polarization mode dispersion (PMD) in optical fibers becomes more and more important and cannot be ignored when
the transmission system is up to 40Gbit/s or above, or transmission distance is several thousand kilometers long. In the
paper, it is discussed four kinds of compensation schemes in 40Gbit/s optical communication system, it point out that
transmission distance is different when use different compensation schemes by pulse broadening theory. And when the
transmission speed is very high or the transmission distance is very long, it is necessary to compensated high-order PMD.
It compared 2nd-order PMD compensated system and first-order PMD compensated system, it point out that
2nd-order PMD compensated system is much better than first-order PMD compensated system by pulse broadening
theory.
When attenuation and chromatic dispersion are compensated for, polarization mode dispersion (PMD) is a major
limitation to the transmission capabilities of optical communication systems. So it is necessary to study PMD. In the
paper, we simulated first-order PMD statistical properties, the relationship of Mean DGD and transmission distance, the
deterioration of the receiver pulse broadening induced by PMD on pulse broadening theory, the distance relay L limited
by system transmission speed B under different PMD, several systems of different PMD restrict the transmission
distance etc., come to conclusion that PMD have some restrictions on high-speed system design. And the higher the rate,
the shorter the distance relay. For low-speed system, by choosing low values of fiber PMD can increase distance relay,
but for high-speed system, it is not a good idea to improve the system by selecting the optical fiber. In the actual design,
you should consider PMD index of optical fiber, chosen code pattern of the system, transmission rate and error rate etc.
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