| 摘要 |
In an optical branch (1) with a substrate (2) and an integrated waveguide structure configured into a Y branch, which is used to couple at least one glass fiber, the waveguide (3) is provided with a constriction that acts as an optical filter before the branching, and causes the forced radiation of undesirable modes. The constriction comprises a first taper (4), which reduces the width of the waveguide (3) to a narrow waveguide section (5) at the inlet to the optical branch (1), and then a mirror-image second taper (6) widens it to the width of the branching waveguides (branches 7).
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