| 摘要 |
The present invention discloses an improved wavelength division multiplexed (WDM) coupler. The WDM coupler includes a WDM filter attached to a first GRIN lens by applying a first heat-curing epoxy. The WDM coupler further includes the first GRIN lens inserted and fixed into a first holding tube by applying a second heat-curing epoxy. The WDM coupler further includes a second holding tube holding a dual fiber pigtail. The dual fiber pigtail is disposed at a first optimal position from the first GRIN lens to achieve a lowest reflection loss with the first and second holding tubes being in contact with each other. The dual fiber pigtail and the first and second holding tubes are fixed together by applying a third heat-curing epoxy. The WDM coupler further includes a second GRIN lens inserted and fixed into a third holding tube by applying a fourth heat-curing epoxy. The WDM coupler further includes a fourth holding tube holding a standard single fiber pigtail. To achieve a lowest transmission loss, the single fiber pigtail is disposed at a second optimal position from the second GRIN lens while the first GRIN lens is disposed at a third optimal position from the second GRIN lens. With the first, third and fourth holding tubes being in contact with each other, a fifth heat-curing epoxy is applied to fix the third and fourth holding tubes together and a sixth heat-curing epoxy is applied to fix the first and third holding tubes together.
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