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In optical telecommunication systems, diode lasers are mostly used either as the signal source in the transmitters or as the energy source in the optical amplifiers, their operations affect the performance of the whole system directly. Only under constant temperatures, diode lasers can perform stably, otherwise, their output wavelengths and power efficiencies will change dramatically.
In particular, Dense Wavelength Division Multiplexing (DWDM) systems combine a large number of laser beams of different wavelengths and inject the combined laser beams into a single fiber. The wavelength of each laser needs to be evenly placed within the low attenuation wavelength window of the fiber, so that an optical de-multiplexer at the other end of the fiber can distinguish each laser beam from the other laser beams without cross talks. Since the wavelength of the laser beam changes with the laser temperature, maintaining an accurate and stable laser temperature is a critical task for these DWDM systems.
In Erbium Doped Fiber Amplifiers (EDFA), diode lasers are used as the energy source, so called pump lasers. The laser temperature needs to be kept at a constant value so that the laser power is stable and the noise is minimized.
In addition, numerous passive…
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