Semiconductor lasers are widely used in incoherent/coherent optical communications, optical fiber sensing, and lidar due to their small size, high efficiency, and immunity to vibrations. To support the continuous evol...
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Semiconductor lasers are widely used in incoherent/coherent optical communications, optical fiber sensing, and lidar due to their small size, high efficiency, and immunity to vibrations. To support the continuous evolution of these high-performance application systems, the noise characteristics of semiconductor lasers play a key role and the noise levels need to be reduced to unprecedentedly low values (such as quantum limit). In this paper, a comprehensive overview on the principles, measurements, and suppressions of semiconductor laser noises are provided. First, we introduce the analysis models and key performance indicators of semiconductor lasers related to noise. Then, different noise measurement systems are investigated for semiconductor lasers and the noise characteristics are fully analyzed. Next, the noise suppression methods towards semiconductor lasers are demonstrated from three aspects: the chip structures, the external cavity optical feedback technology and the driving and controlling circuits. Finally, we summarize the recent advances on the noise measurement and suppression of semiconductor laser, future prospects are also discussed.
In order to resolve the current FPGA circuit design in the temperaturecontrol problems, so that programmable FPGA device programming technology to better serve the majority of the hands of staff. In this paper, the m...
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In order to resolve the current FPGA circuit design in the temperaturecontrol problems, so that programmable FPGA device programming technology to better serve the majority of the hands of staff. In this paper, the method used to time counter (clock), state machines (sequential circuits), display driver, input and output signals and the corresponding pin is set such as programming, using the verilog language design controllers to achieve the controlcircuit of the machine, using download-chip development system functional checks and complete the debugging emulator (check simulation waveform), a detailed description of the processing of control events, and through examples demonstrate the practical effect of the method. For the R&D and technical personnel engaged in FPGA circuit design ideas in the temperaturecontrol will provide some help.
This paper presented the factors affecting the wavelength of laser diode.A circuit for temperaturecontrolling for laser wavelength stabilization in CPT atomic clock was *** test showed that the wavelength could be fr...
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This paper presented the factors affecting the wavelength of laser diode.A circuit for temperaturecontrolling for laser wavelength stabilization in CPT atomic clock was *** test showed that the wavelength could be freely changed and stabilized by the *** wavelength control accuracy is 0.0012nm.
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