音頻放大器驅(qū)動(dòng)熱電冷卻器OC-48激光模塊

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　　音頻放大器驅(qū)動(dòng)熱電冷卻器OC-48激光模塊

　　激光設(shè)計(jì)師面臨的共同問題光纖通信系統(tǒng)保持激光器的特性溫度。隨著溫度的漂移激光器的中心頻率也會(huì)漂移。為了防止這個(gè)不必要的頻率漂移，現(xiàn)代固態(tài)激光器模塊熱電冷卻器（TEC），既可以泵出的熱量，進(jìn)入模塊，從而調(diào)節(jié)溫度。熱電冷卻器工作的珀耳帖效應(yīng)。當(dāng)DC電流流經(jīng)TEC器件，熱量為從TEC的一側(cè)轉(zhuǎn)移到其他。這將創(chuàng)建一個(gè)“熱”和“冷”側(cè)該裝置。如果DC電流被逆轉(zhuǎn)，則熱冷側(cè)反。這提供了一個(gè)激光加熱或冷卻的理想方法模塊。然而，TEC必須驅(qū)動(dòng)允許單位加熱的差分方式或冷卻激光器。

　　To provide a method of first order feedback，　an integral thermistor is used to monitor the　temperature of the laser. The manufacturer of　the laser module typically trims the value of　the thermistor to a specific value at the correct　temperature of operation providing a simple　method of controlling the thermoelectric cooler.　Typically， a closed-loop control system and　power amplifier is used to drive current through the TEC. Other methods use pulse width　modulation and an H-Bridge， however the noise　generated by this method may not be acceptable.