报道了在１４０Ｍｂ／Ｓ光通信端机上采用国产１．３μｍ低噪声半导体光放大器作为前置光放大器的研究结果。理论分析和实验表明，必须采用窄带光学滤波器滤除光放大器自发辐射引起的各种噪声。当光学滤波器为最佳带宽４ｎｍ，光放大器为最佳电流６５ｍＡ时（此时增益为１４ｄＢ），系统接收灵敏度改善５ｄＢ。前置光放大器噪声指数大约为３ｄＢ。 The research results of using domestic 1.3μm low noise semiconductor optical amplifier as the preamplifier on 140Mb / S optical communication terminal are reported. Theoretical analysis and experiments show that narrowband optical filters must be used to filter out the various types of noise caused by spontaneous emission of optical amplifiers. When the optical filter is the best bandwidth of 4nm, the optical amplifier is the best current of 65mA (at this time the gain of 14dB), the system to improve the receiving sensitivity of 5dB. Preamplifier noise figure is about 3dB.