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现已采用 VAD 法制成了100KM 长的低损耗单模光纤,它在1.55μm 时损耗为0.3db/KM,在1.3μm 时则为0.5db/KM。用扫频法测得这种光纤在上述两个波长时的6db 带宽在100KM 长时为40MHz,在50KM 时为800MHz。
The VAD method has been used to make a 100KM low loss single-mode fiber, which has a loss of 0.3db / KM at 1.55μm and 0.5db / KM at 1.3μm. The swept-frequency method uses a 6 dB bandwidth of 40 dB at 100 km for the optical fiber at these two wavelengths and 800 MHz at 50 km.