I(lng)ڸ١Lxͨŵ{(dio)Ƽ(Electlro-absorption Modulated LaserEML)ضȷ(wn)ԵҪܸСͻܶȻl(f)չEMLǵһNa(chn)(InGaAsP)늼ͬһ댧(do)wоƬϼɼԴ{(dio)(q)(dng)늉ĵ͡{(dio)ƎweСY(ji)(gu)oȃ(yu)c(din)Ȃy(tng)DFBmڸLxĂݔEMLݔLֵݔʺСʵIJ(dng)ֱܹضȵӰͬr(sh)ԴڹͨSɫɢmȻwŴL̖ݔxɫɢֵSݔxľ۷ecwŴoP(gun)ֻ܌Դ̵ܿҪʹֱ{(dio)Ƽh(yun)h(yun)M㲻ϵy(tng)ԴܵҪĿǰg(sh)εķʹÎضȿƵռԴ
O(sh)Ӌ(j)weСڿƵğ(ThermoElectric CoolerTEC)ͼӟø߾ȵؓ(f)ضϵ(sh)(NTC)ضȂMCUƺEMLM(jn)оܜضȿơEMLă(ni)Y(ji)(gu)DD1ʾ̓(ni)ĶOؓ(f)؟(z)O(jin)ؼͿ_P(gun)ĶOܿƱ
1 TPS63000TEC·O(sh)Ӌ(j)
1.1 TECԭ
TECַQ댧(do)w늺dwڌ(do)w\(yn)(dng)γ(dng)ֱͨ^ɷNͬČ(do)wϣ|όa(chn)şF(xin)QNЧ(yng)TECNЧ(yng)(sh)F(xin)ƟПooĥpoȾ()ٶȿɿԸߡweС{(dio)(ji)c(din)
Ŀǰ(sh)EML(ni)TEC͟裬·ÌоƬO(sh)Ӌ(j)tõTEC·2(g)PWM׃Q4(g)_P(gun)(S1S4)2(g)O(D1D2)2(g)V늸(L1L2)2(g)(C1C2)TECcC1(lin)քePWMlPWM2׃QPWMlPWM2a(chn)ݔֱ늉V1V2ṩoTECITBC=(V1-V2)RTRCRTECTEC늘Og迹@N·͑(yng)Maxim˾MAX8521MAXl968ԼLinear˾LTC1923оƬҪµȱc(din)
EMI^·еăɂ(g)V늸Е(hu)܇a(chn)늴Ÿɔ_ҞV늸еĻ·迹װl(f)ͻ׃(do)®a(chn)J}_
·(sh)ضȵķ̖Լ䅢(sh)O(sh)þģM·Ķʹ(yng)õijɱ͏(f)sTEC(sh)O(sh)ò`
TECĜؿؾȲڲõģMĿƷʽ`eֵ\(yn)ŴԼ(sh)ģD(zhun)Q`һ̶TECĿƾ
ģʽГQ^(f)s·pPWM׃Q(q)(dng)ģʽ²ȡģMĿƷʽ]\(yn)ģʽxܡ
1.2 Ӳ·Y(ji)(gu)O(sh)Ӌ(j)
O(sh)Ӌ(j)һNTPS63000TEC·Ô(sh)ʽPIDМؿؾȸ·Ρ(zh)вD(zhun)QЧʸߵȃ(yu)c(din)
TI˾TPS63000һԴоƬDCDCD(zhun)Q1.85.5 VČ늉(ni)(sh)F(xin)_(d)96%ЧԓоƬڽģʽ֮gԄ(dng)D(zhun)Qͬr(sh)֧ģʽڽģʽ늉3.3 Vݔr(sh)ݔ_(d)1200 mAģʽ늉3.3 V5 Vݔr(sh)ݔ_(d)800 mA
(j)CyOptics˾10 Gbs Cooled EMLʹփԿ֪Ŀɲضȷ-4090TECITEC-1.51.5 AVTEC-3.33.3 VITHCó^100AIJLķ15301565 nmҜضÿ׃1沨LƫƲó^0.13 nm
Y(ji)ϼľwָ(bio)ҪTECضȵľ_ɷ֞3
ٟ茍(sh)r(sh)O(jin)ض
TEC?q)F(xin)ͼӟ
PIDƜ(zhn)_(wn)ؿTEC
TECϵy(tng)һ(g)͵]h(hun)ϵy(tng)
EML(ni)ɵĸ`NTlCضԲ(dng)СNض׃푑(yng)죬һ鱡ĤKֵcضȵP(gun)ϵǷǾԵùʽʾ飺R=RTO×EXP___noise___150
УT0ضȵijʼֵBָ(sh)
̽y(ni)ضضD(zhun)Qֵ׃Ȼɜضȿ·׃D(zhun)Q늉׃D(zhun)QțQ˜yصľD(zhun)Q늉ֵĴСQTEC LOOP·(߀)Դˁ팍(sh)F(xin)TEC·ƟD3O(sh)Ӌ(j)TEC LOOP·
TPS6300XϵоƬ˸õؿݔ늉VOUTͨFB_늉ֵ׃֪ݔ늉V(OUTֵ׃@ζFB_ҪVOUT_ֱB
ɵóVFB=K1.VOUT+K2.VDACK1K2鳣VDACMCUĿ늉ͨ^ݔ늉VOUTֵĿ(dng)ITEC(+)ITEC(-)r(sh)䣬֮Ɵᡣ
@(g){(dio)(ji)늉ݔϵy(tng)Ҫ{(dio)(ji)VOUTֵ߀Ҫһ(g)ⲿķ։BFBVOUTGND֮g{(dio)(ji)VOUTֵV-FBֵ^500 mAIFB^0.01ARBֵС500 k։RAֵVFBYOUTRB_
1.3 TEC LOOP
㷨
PID(Proportional Integral Derivative)һNԵ{(dio)(ji)eֿ֡PIDģMPID͔(sh)PIDƃɷNͨ(j)ݔc(zh)ЙC(j)(gu)Č(yng)P(gun)ϵ(sh)PID㷨֞λʽPIDʽPIDTEC LOOPƲmڜضȿƵλʽPID㷨ԓ㷨ԭΣֻnj(jng)PID㷨Փxɢ\(yn)Ӌ(j)C(j)oyY(ji)(gu)ڌ(sh)F(xin)D4TEC LOOPĿģ
ԓģ͵ĿƱ_(d)ʽ飺
Kp{(dio)(ji)ϵ(sh)Kie{(dio)(ji)ϵ(sh)Kd{(dio)(ji)ϵ(sh)e(k)ÿβɘֵcĿ(bio)ֵIJֵu(k)ÿӋ(j){(dio)ضȵDACֵģеķnj24λDACIJɘֵD(zhun)Qɜض(dng)ǰضcĿ(bio)ضȵIJֵͨ^PID㷨Ӌ(j)(dng)ǰҪ{(dio)DACֵĶ팍(sh)F(xin)ضȵľ_
2 (sh)(yn)Y(ji)
O(sh)Ӌ(j)TEC·քe4ֻEML-102575NضM(jn)3.3(1±10%)VһЩָ(bio)yԇyԇļѭh(hun)M(jn)1вLl(f)书ʵľwy(sh)(j)
ıпԿ(dng)TEC424ֻEMLքe-10桢2575r(sh)IJLƫƾ^0.2 nmʵ׃±1 dB֮(ni)(j)CyOptics˾lO Gbs Cooled EMLʹփԿ֪IJLȫMTDM(r(sh)֏(f))ҪL׃ҲԝMWDM(֏(f))(yng)
Y(ji)Z
O(sh)Ӌ(j)ĻTPS63000Ĝضȿ·ѳɹ(yng)CyOptics˾EMLС(sh)HʹCԓ·Ч،TECĜضM(jn)п܉ʹEMLLڡ(wn)عO(sh)ضģKضȌɶȸɱ(jng)^M(jn)һ(yu)O(sh)Ӌ(j)߀mڴ(sh)ɹͨϵy(tng)