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3 AM—VSB/QAM视频激光干线传输系统 为了得到一个可以接受的AM CNR,需要将基于1310nm DM—DFB激光发射机的视频激光干线传输系统中的光功率损耗预算限制在10dB之内,这个限制就决定了光纤链路的长度以及光分配器的数量。在第1节中我们曾经提出,对于许多诸如长距离超干线传输和其它宽带传输等的应用,需要很大的光功率预算,这要比DM—DFB激光发射机所
3 AM-VSB / QAM Video Laser Trunk Transmission System In order to get an acceptable AM CNR, the optical power loss budget in a video laser trunk transmission system based on a 1310 nm DM-DFB laser transmitter needs to be limited to within 10 dB. This limitation It determines the length of the optical fiber link and the number of optical distributors. In Section 1 we have suggested that for many applications such as long-haul ultra-trunked transmission and other broadband transmissions, a large optical power budget is required, which is higher than for DM-DFB laser transmitters