實時光柵衍射效率測量的光功率采集器設(shè)計

高　正,鄭繼紅,桂　坤,王青青,王康妮,高　輝,陸飛躍,李道萍

(上海理工大學(xué) 光電信息與計算機工程學(xué)院,上海　200093)

?

實時光柵衍射效率測量的光功率采集器設(shè)計

高正,鄭繼紅,桂坤,王青青,王康妮,高輝,陸飛躍,李道萍

(上海理工大學(xué) 光電信息與計算機工程學(xué)院,上海200093)

摘要針對常用光功率計通道單一、測量過程復(fù)雜以及自動化程度較低等缺陷,設(shè)計了一種基于實時光柵衍射效率測量的雙路光功率自動采集器。基于普通光功率計的理論和實際設(shè)計方法,提出設(shè)計方案。設(shè)計硬件方面包括前置放大電路、電源升壓電路、A/D轉(zhuǎn)換電路、單片機控制電路以及串口通信電路的設(shè)計。在軟件方面完成了A/D轉(zhuǎn)換控制程序以及數(shù)據(jù)傳輸、計算與存儲程序的設(shè)計。設(shè)計采用633 nm作為測量的標準激光波長,測量功率范圍在0.01~10 mW,設(shè)計完成后,光柵衍射效率測量精度保證在±4.5%。

關(guān)鍵詞光功率計;單片機;衍射效率;A/D轉(zhuǎn)換

Design of Real-time Optical Power Acquisition System Based onGrating Diffraction Efficiency Measurement

GAO Zheng,ZHENG Jihong,GUI Kun,WANG Qingqing,WANG Kangni,GAO Hui,LU Feiyue,LI Daoping

(School of Optical-Electrical and Computer Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)

AbstractThis paper designs a real-time automatic dual path optical power meter based on grating diffraction efficiency measurement in view of the flaws of ordinary optical power meters such as signal channel,complex measurement process and low degree automation.The design scheme is proposed based of the theory of common power meter.The hardware of this design consists of the preamplifier circuit,power boost circuit,A/D converter circuit,SCM control circuit and serial communication circuit design.The programs of A/D conversion control and data transmission,calculation and storage are designed as well.The working band of the design is 633 nm,and the measuring range of the two-way optical power is from 0.01 to 10 mW.The accuracy of the design is kept at ±4.5%

Keywordsoptical power meter;microchip;diffraction efficiency;A/D conversion

在光纖通信以及相關(guān)光電技術(shù)的測量系統(tǒng)中,光功率是一項重要的參數(shù),不僅需要精確測量光功率的數(shù)值,還需要利用測得的光功率值計算出光衍射效率等相關(guān)參數(shù)[1]。綜合國內(nèi)外近幾年光功率計的發(fā)展趨勢主要可歸為兩類:一類是具有極高的測量性能、價格偏高的臺式光功率計,例如2007年Agilent推出的N7745A具有8通道,功率范圍10-8~10 mW,最小采樣時間可達1 μs,而且功率總體不確定度在±4.5%。另一類則是成本不高、測量精度要求相對較低的手持式光功率計[2]。雖然市面上光功率計在光學(xué)測量性能和精度上都能達到較高要求,但在一些光學(xué)實時測量系統(tǒng),如全息光柵制作中,更需要帶有數(shù)據(jù)處理功能的雙通道甚至是多通道光功率探測器。……