【摘要】：目前,在市場上還沒有發(fā)現(xiàn)基于啁啾光纖光柵的波長解調(diào)儀產(chǎn)品,但其具有的潛在優(yōu)勢不可忽視,如全光結(jié)構(gòu)設(shè)計(jì),無需機(jī)械調(diào)諧,提高了解調(diào)速率;波長解調(diào)精度和動(dòng)態(tài)范圍可根據(jù)需求調(diào)整;支持串、并聯(lián)兩種網(wǎng)絡(luò)拓?fù)浣Y(jié)構(gòu)和成本低等。解調(diào)方案基于強(qiáng)度測量原理,所測光強(qiáng)與波長存在一一對應(yīng)關(guān)系,但受制于光器件溫度敏感性,保證系統(tǒng)溫度穩(wěn)定性是需解決的關(guān)鍵問題。本文研究題目是基于啁啾光纖光柵的波長解調(diào)儀研究,設(shè)計(jì)目標(biāo)包括0~50℃范圍內(nèi)解調(diào)波長溫度穩(wěn)定性控制在10nm內(nèi)等,主要內(nèi)容如下:1)設(shè)計(jì)了基于啁啾光纖光柵的波長解調(diào)系統(tǒng)。在光源和環(huán)形器間增加光隔離器,降低了反射光對光源輸出功率穩(wěn)定性的影響;將光、電路中的器件用熔接形式封裝成盒,便于對密閉空間溫度補(bǔ)償,降低溫度變化對系統(tǒng)整體性能的影響;針對光耦合器分光比易受溫度變化影響,采用基于三路光強(qiáng)解調(diào)的修正方案,將經(jīng)過啁啾光纖光柵的透射光加入計(jì)算,保證計(jì)算中分母的準(zhǔn)確性,降低測量誤差。實(shí)驗(yàn)采用溫控裝置對波長解調(diào)儀在同一中心波長下的測量結(jié)果多次檢測并取平均值,在0~50℃范圍內(nèi)的最大波長變化量減小到8pm,約是補(bǔ)償前的50%,即該波長解調(diào)儀的溫度穩(wěn)定性可達(dá)到8pm。2)將團(tuán)隊(duì)研制的啁啾光纖光柵作為解調(diào)器,設(shè)計(jì)并制作了波長解調(diào)儀的性能樣機(jī),通過評估系統(tǒng)性能指標(biāo),合理設(shè)計(jì)光電轉(zhuǎn)換和信號處理電路及器件選型,實(shí)現(xiàn)一套完整的電路解決方案。利用上述器件搭建基于啁啾光纖光柵的三路光強(qiáng)修正的波長解調(diào)系統(tǒng)并測試,測試結(jié)果表明:所設(shè)計(jì)的波長解調(diào)儀可實(shí)現(xiàn)波長動(dòng)態(tài)范圍為1514.39~1524.51nm,單路解調(diào)波長精度最小值為1.9pm、最大值為16.4pm,多路波長精度平均值為6.78pm。本文創(chuàng)新點(diǎn)是采用團(tuán)隊(duì)研制的啁啾光纖光柵作為解調(diào)器,制作波長解調(diào)儀性能樣機(jī),在設(shè)計(jì)中考慮到光路器件的溫度敏感性,如光耦合器分光比的溫度波動(dòng)等,提出了基于三路光強(qiáng)解調(diào)的修正方案。保證系統(tǒng)溫度穩(wěn)定性提高同時(shí),可根據(jù)需求動(dòng)態(tài)調(diào)整解調(diào)精度和測量路數(shù),使解調(diào)儀在各項(xiàng)指標(biāo)上達(dá)到或接近設(shè)計(jì)目標(biāo)水平。本文所做工作對推動(dòng)采用啁啾光纖光柵實(shí)現(xiàn)波長解調(diào)方案在實(shí)驗(yàn)室階段的研究和大規(guī)模應(yīng)用具有實(shí)用價(jià)值。
[Abstract]:At present, the wavelength demodulator based on chirped fiber grating has not been found in the market, but its potential advantages should not be ignored, such as all-optical structure design, without mechanical tuning, so as to improve the demodulation rate. Wavelength demodulation precision and dynamic range can be adjusted according to the demand, supporting serial, parallel network topology and low cost. The demodulation scheme is based on the principle of intensity measurement. There is a one-to-one correspondence between the measured light intensity and the wavelength. However, due to the temperature sensitivity of the optical device, the key problem to be solved is to ensure the temperature stability of the system. The research topic of this paper is the research of wavelength demodulation instrument based on chirped fiber grating. The design objectives include demodulating wavelength and temperature stability in the range of 0 鈩，

本文編號：2465716