| 摘要 |
The present invention discloses an improved wavelength division multiplexed (WDM) coupler comprising a dual fiber collimator and a single fiber collimator. First, the dual fiber collimator includes a WDM filter attached to a first GRIN lens by applying a first heat-curing epoxy. The dual fiber collimator further includes the first GRIN lens inserted and fixed into a first holding tube by applying a second heat-curing epoxy. The dual fiber collimator further includes a second holding tube disposed on a dual fiber pigtail. When the dual fiber pigtail is disposed at a first optimal position from the first GRIN lens to achieve a lowest reflection loss, the first and second holding tubes and the dual fiber pigtail are fixed together by applying a third heat-curing epoxy. Secondly, the single fiber collimator includes a third holding tube holding and fixing a second GRIN lens and a single fiber pigtail therein by applying a fourth and a fifth heat-curing epoxies with the single fiber pigtail disposed at a second optimal position from the second GRIN lens to achieve a lowest transmission loss. Finally, the dual and single fiber collimators are bonded together by applying a sixth heat-curing epoxy to fix the first and third holding tubes together when the dual fiber collimator is disposed at a third optimal position from the single fiber collimator to achieve a lowest overall transmission loss.
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