| 摘要 |
2081020 9117571 PCTABS00008 Monitoring output of semiconductor optical sources. A monitor photo detector comprises a photodiode having a photosensitive region made up from several spaced active areas, thereby to provide a device region capable of exhibiting photo responsivity which is less than the total active area of the device. Conveniently these active areas may be arranged in groups. The electrical output of selected areas or groups of areas or both may be arranged to be enabled or disabled as appropriate to provide the required photo responsivity of the device.
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