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本文主要叙述以SAGM—APD为检测器的长波长数字光纤通信接收机的设计计算方法。SAGM—APD是吸收区、栅区、倍增区分离的雪崩二极管的简称,它是由InP/InGaAsP/InGaAs构成。它在1.55μm波段显示出高速、高增益、暗电流小、量子效率高的特点。因为它在耗尽一边有三层结构,它的增益M_o和剩余噪声因子F(M_o)的计算方法与传统的Si或Ge—APD有所不同,本文首先对此进行讨论,然后讨论空穴在异质结交界面处的陷落以及雪崩建立时间对SAGM—APD的带宽的影响,最后推导出以SAGM—APD为检测器的数字光纤通信接收机在高速区(>10~8b/s)的灵敏度与码速b的关系和最佳倍增系数Mo_(pt)与码速的关系。计算结果指出,在所讨论的区域内,较低码速时,高阻抗放大器可以改善灵敏度;但在高码速一端,主要是改善SAGM—APD的雪崩建立时间和剩余噪声因子F(M_o)以提高接收机灵敏度。
This article describes the SAGM-APD detector as a long wavelength digital optical fiber communication receiver design and calculation method. SAGM-APD is an abbreviation for the avalanche diode in which the absorption region, gate region, and multiplication region are separated, and is composed of InP / InGaAsP / InGaAs. It shows high speed, high gain, dark current, high quantum efficiency in the 1.55μm band. Because it has a three-layer structure on the depletion side, its calculation of gain M_o and residual noise factor F (M_o) is different from that of conventional Si or Ge-APD. This paper first discusses this and then discusses the difference of holes At the junction of the mass interface and the avalanche settling time, the SAGM-APD bandwidth is deduced. Finally, the sensitivity of the SAGM-APD-based digital optical fiber communication receiver in the high speed region (> 10 ~ 8b / s) The relationship between speed b and the best multiplication coefficient Mo_ (pt) and code speed. The results show that the high impedance amplifier can improve the sensitivity when the code rate is low in the region under discussion. However, at one end of the high code rate, the avalanche settling time and the residual noise factor F (M_o) of the SAGM-APD are improved Improve receiver sensitivity.