光功率計使用方法

針(zhen)對用戶的具體應用，要選擇適合的光功率計，應該(gai)關注以下各點(dian)：

1、選擇合適的探頭類型(xing)和接口(kou)類型(xing)

2、校準精度與你(ni)的光纖和接頭要求范圍相匹配。

3、確(que)定的(de)產品型號與你的(de)測(ce)量范(fan)圍和顯示分辨率相(xiang)一致(zhi)。

4、具備直(zhi)接插(cha)入損(sun)耗測量(liang)的(de) dB功(gong)能。

光功率計注意事項

光(guang)(guang)(guang)功(gong)(gong)(gong)(gong)率(lv)(lv)(lv)的(de)(de)(de)單位是(shi)(shi)(shi)dbm,在光(guang)(guang)(guang)纖收(shou)(shou)(shou)發(fa)器(qi)或交換機(ji)的(de)(de)(de)說明書中有它的(de)(de)(de)發(fa)光(guang)(guang)(guang)和接(jie)(jie)收(shou)(shou)(shou)光(guang)(guang)(guang)功(gong)(gong)(gong)(gong)率(lv)(lv)(lv)，通常發(fa)光(guang)(guang)(guang)小于0dbm，接(jie)(jie)收(shou)(shou)(shou)端能夠接(jie)(jie)收(shou)(shou)(shou)的(de)(de)(de)min光(guang)(guang)(guang)功(gong)(gong)(gong)(gong)率(lv)(lv)(lv)稱為(wei)(wei)靈敏度，能接(jie)(jie)收(shou)(shou)(shou)的(de)(de)(de)max光(guang)(guang)(guang)功(gong)(gong)(gong)(gong)率(lv)(lv)(lv)減去(qu)靈敏度的(de)(de)(de)值的(de)(de)(de)單位是(shi)(shi)(shi)db(dbm-dbm=db)，為(wei)(wei)動(dong)態(tai)范(fan)(fan)圍，光(guang)(guang)(guang)功(gong)(gong)(gong)(gong)率(lv)(lv)(lv)減去(qu)接(jie)(jie)收(shou)(shou)(shou)靈敏度是(shi)(shi)(shi)允(yun)許(xu)的(de)(de)(de)光(guang)(guang)(guang)纖衰(shuai)耗(hao)值。測試時實際(ji)的(de)(de)(de)發(fa)光(guang)(guang)(guang)功(gong)(gong)(gong)(gong)率(lv)(lv)(lv)減去(qu)實際(ji)接(jie)(jie)收(shou)(shou)(shou)到的(de)(de)(de)光(guang)(guang)(guang)功(gong)(gong)(gong)(gong)率(lv)(lv)(lv)的(de)(de)(de)值就是(shi)(shi)(shi)光(guang)(guang)(guang)纖衰(shuai)耗(hao)(db)。端接(jie)(jie)收(shou)(shou)(shou)到的(de)(de)(de)光(guang)(guang)(guang)功(gong)(gong)(gong)(gong)率(lv)(lv)(lv) 佳值是(shi)(shi)(shi)能接(jie)(jie)收(shou)(shou)(shou)的(de)(de)(de)max光(guang)(guang)(guang)功(gong)(gong)(gong)(gong)率(lv)(lv)(lv)-(動(dong)態(tai)范(fan)(fan)圍/2)，一(yi)般不會這樣(yang)(yang)好。于每種(zhong)光(guang)(guang)(guang)收(shou)(shou)(shou)發(fa)器(qi)和光(guang)(guang)(guang)模塊的(de)(de)(de)動(dong)態(tai)范(fan)(fan)圍不一(yi)樣(yang)(yang)，以光(guang)(guang)(guang)纖具體能夠允(yun)許(xu)衰(shuai)耗(hao)多少(shao)要看(kan)實際(ji)情形。一(yi)般來說允(yun)許(xu)的(de)(de)(de)衰(shuai)耗(hao)為(wei)(wei)15-30db左右。

有(you)的(de)(de)說明書會(hui)(hui)只有(you)發光功(gong)率(lv)和傳(chuan)輸(shu)(shu)距(ju)離(li)(li)兩個(ge)參數，有(you)時會(hui)(hui)說明以(yi)每公里光纖衰(shuai)耗多(duo)少算出的(de)(de)傳(chuan)輸(shu)(shu)距(ju)離(li)(li)，大多(duo)是(shi)0.5db/km。用min傳(chuan)輸(shu)(shu)距(ju)離(li)(li)除(chu)以(yi)0.5，就是(shi)能接收(shou)的(de)(de)max光功(gong)率(lv)，如果接收(shou)的(de)(de)光功(gong)率(lv)高于這(zhe)個(ge)值，光收(shou)發器(qi)可能會(hui)(hui)被燒壞。用max傳(chuan)輸(shu)(shu)距(ju)離(li)(li)除(chu)以(yi)0.5，就是(shi)靈敏度，如果接收(shou)的(de)(de)光功(gong)率(lv)低于這(zhe)個(ge)值，鏈路(lu)可能會(hui)(hui)不(bu)通。

光纖(xian)的(de)連(lian)(lian)(lian)(lian)(lian)接(jie)(jie)有兩種(zhong)方(fang)式，一種(zhong)是(shi)固定(ding)(ding)連(lian)(lian)(lian)(lian)(lian)接(jie)(jie)一種(zhong)是(shi)活(huo)(huo)(huo)動連(lian)(lian)(lian)(lian)(lian)接(jie)(jie)，固定(ding)(ding)連(lian)(lian)(lian)(lian)(lian)接(jie)(jie)就是(shi)熔接(jie)(jie)，是(shi)用專用設備通(tong)過放(fang)電，將光纖(xian)熔化使兩段光纖(xian)連(lian)(lian)(lian)(lian)(lian)接(jie)(jie)在一起(qi)，優(you)點(dian)是(shi)衰耗(hao)小(xiao)，缺(que)點(dian)是(shi)操作復雜(za)靈活(huo)(huo)(huo)性差(cha)。活(huo)(huo)(huo)動連(lian)(lian)(lian)(lian)(lian)接(jie)(jie)是(shi)通(tong)過連(lian)(lian)(lian)(lian)(lian)接(jie)(jie)器，通(tong)常在ODF上(shang)連(lian)(lian)(lian)(lian)(lian)接(jie)(jie)尾纖(xian)，優(you)點(dian)是(shi)操 作簡(jian)單(dan)靈活(huo)(huo)(huo)性好(hao)缺(que)點(dian)是(shi)衰耗(hao)大(da)，一般說(shuo)來一個(ge)活(huo)(huo)(huo)動連(lian)(lian)(lian)(lian)(lian)接(jie)(jie)的(de)衰耗(hao)相(xiang)當(dang)于一公(gong)里光纖(xian)。光纖(xian)的(de)衰耗(hao)可以(yi)(yi)這(zhe)樣估算:包(bao)括(kuo)固定(ding)(ding)和活(huo)(huo)(huo)動連(lian)(lian)(lian)(lian)(lian)接(jie)(jie)，每公(gong)里光纖(xian)衰耗(hao)0.5db，如(ru)果(guo)活(huo)(huo)(huo)動連(lian)(lian)(lian)(lian)(lian)接(jie)(jie)相(xiang)當(dang)少，這(zhe)個(ge)值可以(yi)(yi)為0.4db，單(dan)純光纖(xian)不包(bao)括(kuo)活(huo)(huo)(huo)動連(lian)(lian)(lian)(lian)(lian)接(jie)(jie)，可以(yi)(yi)減少至0.3db，理論值純光纖(xian)為0.2db/km；為保(bao)險計大(da)多(duo)數情(qing)況(kuang)下以(yi)(yi)0.5為好(hao)。

（來源：網站(zhan)，版權歸原作者）