一、光衰減器必須裝在什么地方
光衰減器用于控制輸入光強度以及抑制光信號的強度,適用于多種光通信和光系統應用,那么光衰減器一般裝在(zai)什么地方呢?
據了解,根(gen)據維護規程,使用光(guang)衰(shuai)減器(qi)時(shi),一般是將光(guang)衰(shuai)減器(qi)裝(zhuang)在接收端設備側,常見的安裝(zhuang)位置有光(guang)纖連接器(qi)上(shang)、單元(yuan)波導(dao)器(qi)上(shang)或光(guang)學開關/交換(huan)機(ji)中等。
二、光衰減器的性能指標有哪些
1、衰減量和插入損耗
衰減(jian)量和插入(ru)損(sun)耗(hao)是(shi)光(guang)衰減(jian)器(qi)(qi)(qi)的重要指(zhi)(zhi)標(biao)(biao),固定光(guang)衰減(jian)器(qi)(qi)(qi)的衰減(jian)量指(zhi)(zhi)標(biao)(biao)實(shi)際上就是(shi)其插入(ru)損(sun)耗(hao),而可(ke)(ke)變(bian)衰減(jian)器(qi)(qi)(qi)除了(le)衰減(jian)量外,還有單獨的插入(ru)損(sun)耗(hao)指(zhi)(zhi)標(biao)(biao),高質量的可(ke)(ke)變(bian)衰減(jian)器(qi)(qi)(qi)的插入(ru)損(sun)耗(hao)在1.0dB以下,一般情況下普通可(ke)(ke)變(bian)衰減(jian)器(qi)(qi)(qi)的該(gai)項指(zhi)(zhi)標(biao)(biao)小(xiao)于2.5dB即(ji)可(ke)(ke)使用。在實(shi)際選用可(ke)(ke)調(diao)衰減(jian)器(qi)(qi)(qi)時,插入(ru)損(sun)耗(hao)越小(xiao)越好。
2、光衰減器的衰減精度
衰(shuai)(shuai)減(jian)(jian)(jian)精(jing)(jing)度(du)是光衰(shuai)(shuai)減(jian)(jian)(jian)器的重要指標(biao)。通(tong)常機械式可調光衰(shuai)(shuai)減(jian)(jian)(jian)器的衰(shuai)(shuai)減(jian)(jian)(jian)精(jing)(jing)度(du)為其(qi)衰(shuai)(shuai)減(jian)(jian)(jian)量的±0.1倍。其(qi)大小取決于(yu)機械元件(jian)的精(jing)(jing)密(mi)加工程度(du)。固定式光衰(shuai)(shuai)減(jian)(jian)(jian)器的衰(shuai)(shuai)減(jian)(jian)(jian)精(jing)(jing)度(du)很高,通(tong)常衰(shuai)(shuai)減(jian)(jian)(jian)精(jing)(jing)度(du)越高,價(jia)格就越高。
3、回波損耗
在(zai)(zai)光(guang)(guang)器(qi)件參數中(zhong)(zhong)(zhong)影(ying)響(xiang)系統性(xing)能的一個(ge)重(zhong)要指(zhi)標是(shi)回(hui)波(bo)損(sun)耗(hao)。回(hui)返(fan)光(guang)(guang)對光(guang)(guang)網絡系統的影(ying)響(xiang)是(shi)眾所周知的。光(guang)(guang)衰(shuai)減(jian)器(qi)的回(hui)波(bo)損(sun)耗(hao)是(shi)指(zhi)入(ru)射到(dao)光(guang)(guang)衰(shuai)減(jian)器(qi)中(zhong)(zhong)(zhong)的光(guang)(guang)能量和衰(shuai)減(jian)器(qi)中(zhong)(zhong)(zhong)沿入(ru)射光(guang)(guang)路反射出的光(guang)(guang)能量之(zhi)比。高性(xing)能光(guang)(guang)衰(shuai)減(jian)器(qi)的回(hui)波(bo)損(sun)耗(hao)在(zai)(zai)45dB以上。
事實上由于工藝等(deng)方面的(de)原因,衰減(jian)器(qi)實際回波(bo)損耗(hao)(hao)離理論(lun)值(zhi)還有一(yi)定差(cha)距,為(wei)了不致于降低整(zheng)個線(xian)路(lu)回波(bo)損耗(hao)(hao),必(bi)須在相應線(xian)路(lu)中(zhong)使用高回損衰減(jian)器(qi),同時還要求(qiu)光衰減(jian)器(qi)具有更(geng)寬的(de)溫度使用范(fan)圍(wei)和頻譜(pu)范(fan)圍(wei)。