201137488 六、發明說明： 【發明所屬之技術頜 [0001] 本發明係有關於一種光纖放大器’特別係有關於一 種側向光幫浦之光纖放大器。 [先前技術] [0002] 請參閱圖1所示，在習知技術我國公開專利第 200947002號係揭示一種光纖放大器500 ’該光纖放大器 500係包含一增益光纖510、複數個光栅單元520、一反201137488 VI. Description of the Invention: [Technical Jaw of the Invention] [0001] The present invention relates to a fiber amplifier', particularly to a fiber amplifier of a lateral optical pump. [Prior Art] [0002] Referring to FIG. 1, a conventional optical fiber amplifier 500' is disclosed in the prior art. The optical fiber amplifier 500 includes a gain fiber 510, a plurality of grating units 520, and a reverse
射層530及一半導體雷射540，該些光柵單元520係設置 於該增益光纖510之一侧，該反射層5 係覆蓋於該些光 柵單元520，該半導體雷射540係設置於該增益光纖510 之另一側且對應該些光柵單元520，該半導體雷射540係 用以發射一幫浦光541，該幫浦光541係藉由該些光柵單 兀520產生一繞射光，該繞射光可於該增益光纖51〇中進 行反射’然該光纖放大器500系統無法有效提昇該增益光 纖510中之該繞射光，故該增益光纖510之增益介質對該 繞射光之吸收效率較差。 【發明内容】 一種側向光幫浦之光纖放大器，其係包含一增益光 纖、一幫浦光源以及一第一反射層和一第二反射層，該 增益光纖係具有-第-端面、-對應於該第-端面之第 一端面及一位於該第一端面與該第二端面之間的光照射 區，該幫浦光源係設置於該增益光纖之一侧，且可產生 幫浦光，該幫浦光係照射該增益光纖之該光照射區， 該第一反射層及該第二反射層係分別形成於該增益光纖 099112616 表單編號A0101 第3頁/共11頁 0992022310-0 201137488 之該第一端面及該第二端面，且反射該幫浦光。本發明 係藉由該幫浦光源所產生之該幫浦光入射該增益光纖之 一側且該第一反射層及該第二反射層皆具高反射率，當 幫浦光於該第一反射層和該第二反射層之間來回傳播時 ，該增益光纖之增益介質能夠有效的吸收該幫浦光，以 獲得具有高效率之該侧向光幫浦之光纖放大器。 【實施方式】 [0004] 099112616 請參閱第2圖，其係本發明之一較佳實施例，一種侧 向光幫浦之光纖放大器ίο係包含一增益光纖η、一幫浦 . 光源12及一第一反射層13和一第二反射層14，該增益光 纖11係具有一第一端面11a、一對應該第一端面lla之第 二端面1 lb及一位於該第一端面1 ia和該第二端面1 ib之 間之光照射區11 c，該幫浦光源12係設置於該增益光纖11 之一側，且可產生一幫浦光121，該幫浦光121係照射該 增益光纖11之該光照射區11 c ’在本實施例中，該幫浦光 源12係可為一半導體雷射啤列’該第一反射層13係形成 於該增盈光纖11之該第一;，該苐二反射層14係形 | 成於該增益光纖11之該第二端面丨，該第一反射層13及 該第二反射層14係以鍍膜方式形成，該第一反射層13及 該第一反射層14係具有高反射率，並用以反射該幫浦光 121 ° 凊再參閱第2圖，在本實施例中’該側向光幫浦之光 纖放大器ίο另包含有一準直透鏡15，該準直透鏡15係設 置於4幫浦光源12及該增益光纖11之間，該準直透鏡15 係可使β亥幫浦光121準直地導入該增益光纖η中，在本實 施例中，該側向光幫浦之光纖放大器1〇另具有一反射式 表單編號Α0101 第4頁/共11頁 0992022310-0 201137488 光柵16，該反射式光栅16係貼附於該增益光纖π之該光 照射區11c，在本實施例中，該增益光纖11及該反射式光 柵16間係另具有一折射率匹配黏膠17，該折射率匹配黏 膠17係具有高透明度且用於固定該增益光纖丨丨及該反射 式光柵16，請參閱第3圖，該反射式光栅16係具有一基板 161、一形成於該基板161之光柵結構162及一覆蓋該光 柵結構162之金屬層163，在本實施例中，該金屬層163 之材質係為金’其係可提升該幫浦光21之反射率，在本 實施例中，該金屬層163係以鍍膜方式形成於該光柵結構 162 ’當該幫浦光121係穿過該增益光纖11而於該反射式 光柵16反射時，係可藉由該反射式光栅16之該光柵結構 162產生大角度反射，該幫浦光121係導入該增益光纖n ，而在該增益光纖11之該第一反射層13及該第二反射層 14之間進行反射傳播，在本實施例中，該第一反射層j3 係與該第二反射層14平行，其係可使該幫浦光121以最短 路徑在該增益光纖1丨中進行反射傳播。在本實施例中， 由於该增益光纖1 1之該第一反射層丨3係與該第二反射層 14平行且該第一反射層13和該第二反射層14皆具高反射 率，因此當該幫浦光121導入該增益光纖11内進行反射傳 播時，可提升該增益光纖U内之該幫浦光121，使得該增 益光纖11之增益介質能夠有效的吸收該幫浦光121，以獲 得具有尚效率之該側向光幫浦之光纖放大器1。 本發明之保護範圍當視後附之申請專利範圍所界定 者為準，任何熟知此項技藝者，在不脫離本發明之精神 和範圍⑽作之任何變化與修改，均屬於本發明之保護 範圍。 099112616 表單編號A0101 第5頁/共11頁 0992022310-0 201137488 【圖式簡單說明】 [0005] 第1圖：習知側向光幫浦之光纖放大器之示意圖。 第2圖：依據本發明之一較佳實施例，一種側向光幫浦之 光纖放大器之示意圖。 第3圖：該側向光幫浦之光纖放大器之反射式光柵之側面 剖視圖。 【主要元件符號說明】 [0006] 10側向光幫浦之光纖放大器 11增益光纖 lib第二端面 12幫浦光源 13第一反射層 15準直透鏡 11 a第一端面 11c光照射區 121幫浦秦 14第二反射層 16反射式光柵 161基板 163金屬層 500光纖放大器 520光栅單元 540半導體雷射 162光柵結構 17折射率匹配黏膠 510增益光纖 530反射層 541幫浦光 0992022310-0 099112616 表單編號A0101 第6頁/共11頁The imaging layer 520 is disposed on one side of the gain fiber 510, and the reflective layer 5 is disposed on the grating unit 520. The semiconductor laser 540 is disposed on the gain fiber. The other side of the 510 and corresponding to the grating unit 520, the semiconductor laser 540 is used to emit a pump light 541, the pump light 541 generates a diffracted light by the grating unit 520, the diffracted light The gain can be reflected in the gain fiber 51. However, the fiber amplifier 500 system cannot effectively enhance the diffracted light in the gain fiber 510, so the gain medium of the gain fiber 510 is inefficiently absorbed by the diffracted light. SUMMARY OF THE INVENTION A fiber amplifier for a lateral optical pump includes a gain fiber, a pump source, and a first reflective layer and a second reflective layer. The gain fiber has a -first end face, a corresponding a first end surface of the first end surface and a light irradiation area between the first end surface and the second end surface, the pump light source is disposed on one side of the gain fiber, and can generate pump light. The light beam is irradiated to the light irradiation region of the gain fiber, and the first reflection layer and the second reflection layer are respectively formed on the gain fiber 099112616. Form No. A0101 Page 3 / 11 pages 0992022310-0 201137488 An end surface and the second end surface reflect the pump light. According to the invention, the pump light generated by the pumping light source is incident on one side of the gain fiber, and the first reflective layer and the second reflective layer both have high reflectivity, when the pump light is in the first reflection When the layer and the second reflective layer propagate back and forth, the gain medium of the gain fiber can effectively absorb the pump light to obtain a fiber amplifier with high efficiency of the lateral light pump. [Embodiment] [0004] 099112616 Please refer to FIG. 2, which is a preferred embodiment of the present invention, a side optical pump fiber amplifier ίο includes a gain fiber η, a pump, a light source 12 and a a first reflective layer 13 and a second reflective layer 14 having a first end face 11a, a pair of second end faces 1 lb of the first end face 11a, and a first end face 1 ia and the first The light-irradiating area 11 c between the two end faces 1 ib is disposed on one side of the gain fiber 11 and generates a pump light 121 that illuminates the gain fiber 11 In the present embodiment, the pumping light source 12 can be a semiconductor laser beer column. The first reflective layer 13 is formed on the first of the brightness increasing fibers 11; The second reflective layer 14 is formed in the second end face 该 of the gain fiber 11 , and the first reflective layer 13 and the second reflective layer 14 are formed by coating, the first reflective layer 13 and the first reflection The layer 14 has a high reflectivity and is used to reflect the pump light 121 °. Referring to Figure 2, in this embodiment The lateral optical fiber amplifier ίο further includes a collimating lens 15 disposed between the 4 pumping light source 12 and the gain fiber 11, the collimating lens 15 being capable of making The pump light 121 is collimated into the gain fiber η. In the embodiment, the side optical pump fiber amplifier 1 has a reflective form number Α0101. Page 4 / 11 pages 0992022310-0 201137488 The grating 16 is attached to the light-irradiating area 11c of the gain fiber π. In the embodiment, the gain fiber 11 and the reflective grating 16 further have an index matching adhesive 17 The refractive index matching adhesive 17 has high transparency and is used for fixing the gain fiber 丨丨 and the reflective grating 16. Referring to FIG. 3, the reflective grating 16 has a substrate 161 formed on the substrate. The grating structure 162 of 161 and the metal layer 163 covering the grating structure 162, in the embodiment, the material of the metal layer 163 is gold, which can enhance the reflectivity of the pump light 21, in this embodiment. The metal layer 163 is formed by coating The grating structure 162 ′ when the pump light 121 passes through the gain fiber 11 and is reflected by the reflective grating 16 , the grating structure 162 of the reflective grating 16 can generate a large angle reflection, the pump light 121 is introduced into the gain fiber n, and is reflected and propagated between the first reflective layer 13 and the second reflective layer 14 of the gain fiber 11. In this embodiment, the first reflective layer j3 is coupled to the first The two reflective layers 14 are parallel, which enables the pump light 121 to be reflected and propagated in the gain fiber 1丨 in the shortest path. In this embodiment, since the first reflective layer 丨3 of the gain fiber 11 is parallel to the second reflective layer 14 and the first reflective layer 13 and the second reflective layer 14 have high reflectivity, When the pump light 121 is introduced into the gain fiber 11 for reflection propagation, the pump light 121 in the gain fiber U can be raised, so that the gain medium of the gain fiber 11 can effectively absorb the pump light 121. A fiber amplifier 1 of the lateral optical pump having an efficiency is obtained. The scope of the present invention is defined by the scope of the appended claims, and any changes and modifications made by those skilled in the art without departing from the spirit and scope of the invention are within the scope of the invention. . 099112616 Form No. A0101 Page 5 of 11 0992022310-0 201137488 [Simple Description of the Drawings] [0005] Figure 1: Schematic diagram of a known optical fiber amplifier for a lateral light pump. Figure 2 is a schematic illustration of a side optical pump fiber amplifier in accordance with a preferred embodiment of the present invention. Figure 3: A side cross-sectional view of a reflective grating of the optical amplifier of the lateral optical pump. [Major component symbol description] [0006] 10 lateral optical fiber amplifier 11 gain fiber lib second end face 12 pump light source 13 first reflective layer 15 collimating lens 11 a first end face 11c light irradiation zone 121 pump Qin 14 second reflective layer 16 reflective grating 161 substrate 163 metal layer 500 fiber amplifier 520 grating unit 540 semiconductor laser 162 grating structure 17 index matching adhesive 510 gain fiber 530 reflective layer 541 pump light 0992022310-0 099112616 form number A0101 Page 6 of 11