Although FRAs are often used in long-haul systems, we believe they can also benefit metropolitan networks with its better noise performance.

• 此外，一般光纤拉曼放大器多是用来作为远距离间的光放大器，但我们认为光纤拉曼放大器在杂讯方面的良好表现，也可以应用在都市间的区域网路中。