| 摘要 |
A bi-directional optical subassembly (BOSA) with a unique arrangement to set the WDM filter is disclosed. The BOSA includes the stem and the lens cap. The stem mounts both the LD and the PD. While, the lens cap provides, in addition to the condenser lens, a structure to set the WDM filter in a top center thereof. The WDM filter is set in the lens cap with a present angle to the primary surface of the stem when the lens cap is fixed to the stem. Assembling the lens cap with the stem, the relative optical alignment between the LD, the PD and the WDM filter is performed.
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