Trimming technique at mixer trimming process.Mixer trimming method is used same technique with PBS trimming.However mixer trimming, process uses low power because phase of each polarize at mixer has to change in same angle, So,. If power supplies gives high power as PBS trimming phase of, each polarize will shift as PBS trimming result. This will. Effect to next process which is PBS trimming process.The DC power supplies give power around 2.2-2.5W. Mixer trimming process uses equipments as shown in Figure 6 which composes. With 4 DC power supplies stage, controller, controller TEC, switch optical, light ASE source and SWS measurement system. 2 DC. Power supplies are used for trimming upper mixer while other two are used for lower mixer. ASE light source is used to alignment. While tunable with SWS detector module is used to measurement polarize dependence loss (PDL).Thin film heater at mixer part is at Y-brunch of both signal and LO as shown in Figure 7. The thin film heater connects. With three electrodes. Electrode1 and electrode2 are anode while electrode 3 is common cathode. From, these electrodes the. Trimming procedure will change refractive index (phase angle) in pair, of Y-branch i.e. Upper side of LO with lower side. Of signal and lower side of LO with upper side of signal. So trimming at, mixer will have some phase angle error because. Of relation of LO and signal thin film heater. That means trimming at mixer cannot change only each branch of Y-branch.
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