In digital repeater, the application of digital intermediate frequency technology and realization of optical fiber transmission for distance will require for little Phase Noise of Phase-Locked Source.
数字直放站采用数字中频处理技术方式并通过光纤实现远距离信号传输，此对系统中的锁相源的相位噪声提出了很高的要求。
The second system is tunable laser light source based on semiconductor optical amplifier(SOA), light output power and signal-to-noise ratio are improved effectively;
第二套系统采用的是基于半导体光放大器（SOA）的可调谐激光器做光源，有效的增加了光源的输出功率，提高了信噪比；
In the optical-fiber channel, amplified spontaneous emission (ASE) noise in the optical amplifier is the major source of noise.
在远程光纤信道中，放大器自发辐射(ase)噪声是主要噪声源。
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