JP4423668B2 - 光導波路 - Google Patents
光導波路 Download PDFInfo
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- JP4423668B2 JP4423668B2 JP2004156341A JP2004156341A JP4423668B2 JP 4423668 B2 JP4423668 B2 JP 4423668B2 JP 2004156341 A JP2004156341 A JP 2004156341A JP 2004156341 A JP2004156341 A JP 2004156341A JP 4423668 B2 JP4423668 B2 JP 4423668B2
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Description
本発明はまた、前記入力光導波路部の中心が、前記光導波路の入力端部の幅方向中心と一致していないことを特徴とする。
前記入力側端部が直線マルチモード光導波路部で、前記出力側端部がシングルモード光導波路部であり、前記入力側端部の直線マルチモード光導波路部の中心線と、前記出力側端部のシングルモード光導波路部の中心線が一致していることを特徴とする光導波路である。
本発明の第1実施例の第1光導波路1は、波長780nmの光束を使用するものであって、図1に示すように、厚さ3μm、幅11μm、長さ500μmの第1光導波路部10と、厚さ3μm、幅5μm、長さ63μmの第2光導波路部26、及び厚さ3μm、幅3μm、長さ100μmの第3光導波路部30を想定してシュミレーションを行った。第1光導波路部10は、材質フッ素化ポリイミド、屈折率1.5274であり、クラッドは、材質フッ素化ポリイミド、屈折率1.5227である。
本発明の第2実施例の第1光導波路101は、波長660nmの光束を使用するものであって、図4に示すように、厚さ3μm、幅11μm、長さ550μmの第1光導波路部110と、厚さ3μm、幅5μm、長さ67μmの第2光導波路部126、及び厚さ3μm、幅3μm、長さ100μmの第3光導波路部130を想定してシュミレーションを行った。第1光導波路部101は、材質フッ素化ポリイミド、屈折率1.5274であり、クラッドは、材質フッ素化ポリイミド、屈折率1.5227である。
第1実施例及び第2実施例においては、第1光導波路部10、110により中心ずれして入射した光束を射出面においてより中心軸に近づけ、さらに第2光導波路部26、126により入射面において中心ずれした入射した光束を射出面においてほぼ中心軸上から射出し、すなわち2段階で光束を射出面の中心軸上付近から射出していた。しかしこの段数には限定がなく、1段、あるいは3段以上であってもよい。
また、上記フッ素を含まないポリイミド系樹脂の前駆体溶液は、N−メチル−2−ピロリドン,N,N−ジメチルアセトアミド、γ−ブチロラクトン、ジメチルスルホキシドなどの極性溶媒中で、フッ素を含まないテトラカルボン酸二無水物とフッ素を含まないジアミンを反応させることにより得られる。
ポリイミド系樹脂前駆体溶液は、スピナあるいは印刷などによる方法により基板表面上に塗布され、最終温度200〜400℃で熱処理し硬化されてポリイミド系樹脂被膜とされる。
10 第1光導波路部
24 入力側端面部
26 第2光導波路部
28 出力側端面部
30 第3光導波路部
40 出力側端面部
Claims (6)
- 入力光導波路部と、出力光導波路部と、前記出力光導波路部とともに導波路基板に形成された光導波路部とを有し、前記光導波路部は、コアとクラッドからなり、前記光導波路部の入力端部が前記入力光導波路部から入力を受け、前記光導波路部の出力端部が前記出力光導波路部へ出力する光導波路であって、
前記入力光導波路部が、光ファイバーであり、この光ファイバーの中心が、前記光導波路部の入力端部の幅方向中心と一致しておらず、
前記出力光導波路部の中心が、前記光導波路部の出力端部の幅方向中心と一致しており、
前記光導波路部のコアは、その厚さが一定で、幅が異なる少なくとも2段の段階状であり、幅の異なる前記光導波路部の各段は、幅方向中心が一致しており、入力側の段の幅が出力側の段の幅よりも大きく、
幅の異なる前記光導波路部の最終段以外の各段において、その入射面にその幅方向に中心ずれして入射した光束が、その出射面において、前記入射面の中心ずれ量よりも小さな中心ずれ量だけ幅方向中心からずれた位置に光量極大領域を形成するように、入射面から出射面までの長さが設定され、
幅の異なる前記光導波路部の最終段において、その入射面においてその幅方向に中心ずれして入射した光束が、その出射面において、ほぼ幅方向中心から出射されることを特徴とする光導波路。 - 前記光ファイバーが、シングルモード光ファイバーであることを特徴とする請求項1に記載の光導波路。
- 前記光ファイバーのコアの直径と前記出力光導波路部のコアの幅とが同一であることを特徴とする請求項1に記載の光導波路。
- 幅の異なる前記光導波路部の最初の段が直線マルチモード光導波路部で構成され、幅の異なる前記光導波路部の最終段がシングルモード光導波路部で構成されることを特徴とする請求項1に記載の光導波路。
- 前記光導波路部のコアは、2段の段階状であり、厚さが3μmであり、入力側の段の幅が11μmであり、出力側の段の幅が5μmであり、波長780nmを使用するために、入力側の段の長さが500μmであり、出力側の段の長さが63μmであることを特徴とする請求項1に記載の光導波路。
- 前記光導波路部のコアは、2段の段階状であり、厚さが3μmであり、入力側の段の幅が11μmであり、出力側の段の幅が5μmであり、波長660nmを使用するために、入力側の段の長さが550μmであり、出力側の段の長さが67μmであることを特徴とする請求項1に記載の光導波路。
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