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阐述了光纤通信前置放大器的设计原理，分析了光接收机中ＰＩＮ二极管和ＧａＡｓＦＥＴ器件的信号模型和噪声模型，提取了放大器用ＧａＡｓＦＥＴ器件的模型参数（包括大信号、小信号和噪声模型参数）。利用ＰＳＰＩＣＥ程序对光前置放大器进行了模拟分析和优化设计，并实际制作了用于２．４Ｇｂ／ｓ光纤通信的ＰＩＮ－ＨＥＭＴ前置放大器。实测结果表明放大器３ｄＢ带宽达到ＤＣ～４．４ＧＨｚ，增益为１８±１ｄＢ；加入ＰＩＮ二极管后的光接收模块的３ｄＢ带宽为ＤＣ～１．６８８ＧＨｚ，满足了２．４Ｇｂ／ｓ光纤通信的需要。
The design principle of optical fiber communication preamplifier is expounded. The signal model and noise model of PIN diode and GaAsFET device in optical receiver are analyzed. The model parameters (including large signal, small signal and noise model parameters) of GaAsFET amplifier are extracted. . The PSPICE program was used to simulate and optimize the optical preamplifier. The PIN-HEMT preamplifier for 2.4Gb / s optical fiber communication was actually fabricated. The measured results show that the 3dB bandwidth of the amplifier reaches DC ~ 4.4GHz and the gain is 18 ± 1dB. The 3dB bandwidth of the optical receiver module with PIN diode is DC ~ 1.688GHz, which meets the needs of 2.4Gb / s optical fiber communication.