CN102449864A - 用于高功率水平的级联拉曼激光发射的***和方法 - Google Patents
用于高功率水平的级联拉曼激光发射的***和方法 Download PDFInfo
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Abstract
在光放大***中,基于光纤的振荡器、放大器和级联拉曼谐振器串联耦合在一起。提供振荡器的输出作为进入放大器的输入,提供放大器的输出作为进入级联拉曼谐振器的泵浦输入,并且级联拉曼谐振器提供目标波长的单模辐射作为输出。在振荡器和放大器之间连接损耗元件,由此振荡器与放大器和级联拉曼谐振器光学隔离。用于滤除在级联拉曼谐振器中产生的反向传播的斯托克斯波长的滤波器耦合在隔离器和放大器之间。振荡器可以在第一功率水平范围内工作,并且放大器和级联拉曼谐振器可以在超过第一功率水平范围的第二功率水平范围内工作。
Description
对相关申请的交叉引用
本申请要求2009年5月11日提交的61/177058号美国临时专利申请的优先权,该申请由本申请的受让人拥有,其全部内容通过引用包含在本文中。
技术领域
本发明总体上涉及光纤装置和方法,并且更具体地,涉及改进的用于高功率水平的级联拉曼激光发射的***和方法。
背景技术
光纤激光器和放大器典型地基于掺有激光激活(laser-active)的稀土离子(如镱(Yb)、铒(Er)、钕(Nd)等)的光纤。光纤中的受激拉曼散射是有用的效应,其可被用于在这些光纤不工作的波长区域提供非线性增益。当激光束通过拉曼激活(Raman-active)光纤传播时发生受激拉曼散射,结果导致称为“斯托克斯频移”的可预知的波长增加。通过在一段拉曼激活光纤的输入端和输出端提供一系列特定波长的反射光栅,可以产生一系列级联斯托克斯频移,以将初始波长转换为选定的目标波长。
图1是根据现有技术的一个示例性***20的图,其中使用受激拉曼散射产生用于泵浦掺铒光纤放大器(EDFA)的高功率输出。如所示出的,***20包括两个级:整体(monolithic)Yb光纤激光器40和级联拉曼谐振器(CRR)60。
在激光器40中,由一段在1000nm至1200nm的区域内工作的双包层掺Yb光纤42提供激活介质。在光纤42的输入端提供高反射光栅44,并且在光纤42的输出端提供输出耦合光栅46。在该例子中,光栅44和46被写入熔合到光纤42的分开的无源光纤段中。还可以将光栅44和46直接写入光纤42的输入端和输出端中。
高反射器件44、输出耦合器46和光纤42一起用作激光器谐振器48。由利用锥形光纤束(tapered fiber bundle,TFB)52耦合到光纤42的多个泵浦二极管50向光纤42提供泵浦能量。在该例子中,激光器40提供波长为1117nm的单模辐射作为输出。
该激光器的输出作为进入CRR 60的输入发出。CRR 60包括拉曼激活光纤62,包括在其输入端提供的第一多个高反射光栅64和在其输出端提供的第二多个高反射光栅66。在拉曼光纤62的输出端处还提供了输出耦合光栅68。在该例子中,输入光栅64和输出光栅66被写入熔合到光纤62的分开的无源光纤段中。还可以将光栅64和66直接写入光纤62的输入端和输出端中。
输入高反射器件64、输出高反射器件66、输出耦合器68和拉曼光纤62提供一系列嵌套的拉曼腔体70,所述腔体在宽范围上产生一系列级联的斯托克斯频移,以一系列步骤将1117nm的输入波长增加到1480nm的目标波长。输出耦合器68提供1480nm的目标波长的***输出72,该输出可被随后用于以基模泵浦高功率掺铒光纤放大器(EDFA)。
***20可被用于需要1480nm以外的其它输出波长的其它应用,并且可被配置为只在单个步骤中产生输出波长。
尽管图1示出使用光栅64、66和68构造的级联拉曼谐振器,但是使用其它波长选择性元件(如熔合光纤耦合器(fused-fiber coupler)和薄膜滤波器)以及其它结构(如WDM环路镜)的类似谐振器也是公知的。另外,还可以考虑线性、单向环或双向环腔体几何结构。此外,图1示出了配置成作为激光器工作的级联拉曼谐振器,但是它同样可通过中断最后一组光栅并替代注入该波长的信号而被配置成作为放大器工作。与图1中所示的配置类似,这些附加配置将在一系列步骤中将1117nm的输入波长增加到1480nm的目标波长。
现有技术的***20受到已知的局限的影响。例如,一个问题是由于在***20中将针对不同波长和位置的多个反射器结合产生了耦合的多个腔体这一事实引起的。例如,将看到针对1117nm的激光波长存在三个反射器,即反射器44和46以及输出反射器组66中最左侧的部件。一般来说,对于相对低功率的***(例如在1480nm输出5W)而言,这不会造成问题,但是对于高功率的***而言,这会造成问题。近来,对拉曼光纤激光器的功率范围进行了研究,并且从CRR已经展示出了高达41W的功率水平。类似的情况还出现在使用其它公知结构(例如利用WDM环路镜)构造的级联拉曼谐振器中。
尽管从这种***展示出了高功率,但是图1中的装置的耦合腔体的性质对于长期可靠操作而言有着重大的关联。具体来说,该耦合腔体可以使该***变得不稳定并且产生具有足够高峰值功率的脉冲,从而损坏各构件。特别是发现该激光器的高反射器件44是该***中的薄弱环节,推测这是由于通过其传播的高功率造成的,并且还观测到高反射器件44在包括例如使用***20泵浦掺铒光纤放大器等装置的多种条件下失效。另外,在该拉曼激光器中产生的中间斯托克斯阶次的光可能反向传播,进入Yb放大器并且回到泵浦二极管,导致它们失效。此外,在第一斯托克斯频移下的光在Yb的增益带宽内,并且在到达该二极管之前被放大。显然这也是有害的。
发明内容
本发明解决了现有技术的这些问题以及其它问题,本发明的一个方面涉及一种光放大***,其中基于光纤的振荡器、放大器和级联拉曼谐振器(CRR)串联耦合在一起。振荡器的输出被提供作为进入放大器的输入,放大器的输出被提供作为进入CRR的输入,CRR提供目标波长的单模辐射作为输出。依赖于波长的损耗元件连接在振荡器和放大器之间,以防止光反向传播进入振荡器。该振荡器可在第一功率水平范围内工作,该放大器和振荡器可在超过第一功率水平范围的第二功率水平范围内工作。
附图说明
图1是根据现有技术的***的图,其中使用掺Yb光纤激光器来泵浦级联拉曼谐振器。
图2是根据本发明一方面的***的框图,其中使用主振荡器功率放大器配置来泵浦级联拉曼谐振器。
图3是示出图2的***中的示例性振荡器级的图。
图4是示出图2的***中的示例性放大器级的图。
图5是示出图2的***中的示例性级联拉曼谐振器级的图。
图6是根据本发明另一方面的***的框图,其中使用半导体激光振荡器。
图7是根据本发明另一方面的方法的流程图。
具体实施方式
本发明的各方面涉及为上述现有技术的缺点提供解决方案的光放大器***。
返回到图1的***20,可以看出一个可能的解决方案是在Yb光纤激光器40和CRR 60之间设置光隔离器。在图1的结构中,正在研究的高功率形成重大挑战,因为来自CRR 60的1480nm的41W的输出功率需要大于100W的1117nm的输入功率,这远高于当前光纤耦合隔离器所能经受的水平。
本发明的一方面为开发具有高可靠性的高功率拉曼激光器提供解决方案,其中Yb光纤激光器(尤其是激光器的高反射器件)与拉曼激光器隔离。根据本发明的该方面,通过将整体的高功率Yb光纤激光器分解成主振荡器功率放大器(MOPA)配置来实现隔离。
MOPA配置已经在其它情况下用于产生具有良好受控光学性能的高功率激光源。MOPA配置还没有被用在泵浦级联拉曼谐振器(CRR)的情况中,但已经可以商业上获得由掺Yb激光器泵浦的CRR很多年了。使用MOPA配置泵浦级联拉曼谐振器(CRR)是有利的,因为它允许显著增加***的功率范围而不牺牲可靠性。
传统上,MOPA配置被用于实现无法单独在振荡器中获得的光学特征。例如,有人使用振荡器/放大器配置来产生高功率的窄线宽辐射,因为构造高功率的窄线宽激光器很难。在拉曼应用中,MOPA不产生具有比单个激光器的光学特性更优越的光学特性的输出辐射。具有中等线宽的200W或300W输出功率的掺Yb光纤激光器没有引入重大挑战。在以不同于Yb激光器的波长工作的附加光学元件连接到***中时所描述的MOPA配置保护光学构件。如下面描述的,可以通过使用设置在振荡器和放大器之间的依赖于波长的光学元件实现该保护。
图2是示出该方法的***100的框图。如图2中所示,***100包括三个级:振荡器120、放大器140和级联拉曼谐振器(CRR)160,其产生具有选定波长和亮度水平的高功率输出180。
激光器高反射器件位于振荡器级120中,振荡器级120在相对低的功率下工作,并且通过一个或多个适当的耦合装置与高功率放大器140和CRR 160分离,所述耦合装置防止潜在有害的高功率光反向传播到振荡器120。处于说明的目的,将这种类型的装置通统称为“依赖于波长的损耗元件”。这种依赖于波长的损耗元件包括例如熔合光纤或者基于滤波器的波分复用器(WDM)、长周期光栅、适当掺杂的光纤、滤波器光纤或者倾斜布拉格光栅。还可以使用传递来自振荡器的辐射并防止反向传播来自放大器或CRR的波长移位的辐射的其它依赖于波长的损耗元件。
由于拉曼散射的特性,CRR中来自多个斯托克斯频移的许多不同波长的光可以反向朝向振荡器传播。这些波长不同于激光振荡器工作的波长。因此,可以使用一个或多个的依赖于波长的损耗元件去除这些波长的光。另外,可能有与激光振荡器波长相同波长的光反向传播。这种光不能被单个依赖于波长的损耗元件去除。因此,使用光隔离器,所述光隔离器允许给定波长的光向前传播以进行传递,同时防止同一波长的光反向传播。因此,除了依赖于波长的损耗元件以外,还可以在振荡器和放大器之间使用光隔离器。
***100包括连接在振荡器120和放大器140之间的WDM 192形式的依赖于波长的损耗元件。另外,光隔离器191连接在振荡器120和放大器140之间。光隔离器191使得光只在一个方向上穿过它传播,即从振荡器120到放大器140。WDM 192被配置成滤除在谐振器160中产生的反向传播的斯托克斯波长以防止这些波长的光到达振荡器120。WDM 192可以例如基于熔合光纤或薄膜耦合器、基于光栅类型的装置或者提供依赖于波长的滤波器功能的其它装置。尽管***100示出使用连接在振荡器120和放大器140之间的依赖于波长的损耗元件192和光隔离器191,但是可以通过仅使用这些构件中的一个单独地或者与一个或多个的其它构件结合来实现本发明的各方面。
因此,所描述的配置通过防止振荡器120的构件暴露于潜在有害的高功率光,允许振荡器120在相对低的功率水平工作,同时放大器140和CRR 160可以在相对高的功率水平工作。
图3至图5中更详细地示出了振荡器120、放大器140和CRR 160。
如图3中所示,振荡器120包括具有输入端122和输出端123的第一段适当的激光激活光纤121。在本例子中,所使用的光纤121是双包层掺Yb光纤。从本说明将明显看出还可以使用其它适当的光纤。例如,如果功率水平足够低,那么可以不必使用双包层光纤。
在光纤输入端122提供高反射器件(HR)124,并且在光纤输出端123提供输出耦合器(OC)125。高反射器件124、输出耦合器125和光纤121起到激光器腔体126的作用。在本例子中,高反射器件124和输出耦合器125被写入熔合到光纤121的分开的无源光纤段中。还可以将光栅124和125直接写入光纤121的输入端和输出端中。
如图3中进一步示出的,泵浦源127,如二极管激光器或其它适当装置,提供输入到光纤段121中的能量。泵浦127通过锥形光纤束(TFB)128或者其它适当的装置耦合到光纤121。因为振荡器120是相对低功率的,所以图3示出耦合到光纤121的一个泵浦127。泵浦装置127的数量可以增加以实现特定量的泵浦能量。此外,如上所述,光纤121可以不必是双包层光纤。如果光纤121不是双包层光纤,那么不使用锥形光纤束。
然后提供振荡器的输出130作为进入放大器140的输入。如图2中所示,反向传播防止装置190,即隔离器191和WDM 192,耦合在振荡器120和放大器140之间的路径中。如上文讨论的,通过仅使用这些构件中的一个,或者利用一个或多个的其它类似构件,或者它们的一些组合,可以实现本发明的各方面。
图4是更详细地示出放大器140的图。如图4中所示,功率放大器级140包括具有输入端142和输出端143的相应的第二光纤段。在本例子中,用于提供第二光纤段141的放大器光纤是激光激活双包层掺Yb光纤。包括多个激光二极管泵浦144的相应的第二泵浦源使用第二锥形光纤束(TFB)145等装置耦合到第二光纤段141。泵浦源将主振荡器激光器输出130放大到预定的功率水平。放大器的输出150然后被发出,作为进入CRR级160的输入。
图5显示更详细地示出一个类型的级联拉曼谐振器160的图。级联拉曼谐振器160包括具有输入端162和输出端163的第三光纤段161。第三光纤段161是适当的拉曼激活光纤。如下文描述的,拉曼光纤161位于谐振腔体内,在谐振腔体的输出端具有输出耦合器。该谐振腔体和该输出耦合器具有波长响应,该波长响应被配置成在级联拉曼谐振器的输入中产生一系列级联的一个或多个的斯托克斯频移,从而将其波长增加到选定的目标波长,在输出耦合器处提供该选定的目标波长作为输出。
特别地,拉曼光纤161具有小的有效区域和正常色散(即,负色散)。正常色散防止调制不稳定,调制不稳定会在高功率水平导致超连续产生。选择该小的有效区域以在由放大器输出150提供的功率水平产生高拉曼增益,同时避免由非常高的光强导致的有害的高阶的非线性效应。因此,可以在该级联拉曼谐振器中产生个多斯托克斯级,其中多个拉曼谐振器可以由通过拉曼斯托克斯频移以波长分开的多个光纤-布拉格光栅构成。
因此,如图5中所示,在拉曼光纤161的输入端162提供第一系列的特定波长的高反射光栅164(HR2、HR4、HR6、HR8、HR10),在拉曼光纤161的输出端163提供第二系列的特定波长的高反射光栅165(HR1、HR3、HR5、HR7、HR9)。另外,在拉曼光纤161的输出端163提供输出耦合器(OC)166。在本例子中,光栅164、165和166被写入熔合到拉曼光纤161的分开的多段无源光纤中。还可以将光栅164、165和166直接写入拉曼光纤161的输入端和输出端。
输入光栅164、输出光栅165、166和拉曼光纤161提供一系列嵌套的拉曼腔体167。高反射器件164、165被配置成产生一系列级联的斯托克斯频移以将放大器输出(和CRR输入)150的波长提高到目标波长,通过输出耦合器166将该目标波长耦合出光纤,并提供其作为具有选定的功率水平、亮度水平和波长的***输出。可以使用额外的泵浦反射器(未示出)再循环未使用的Yb辐射以增加效率。
应该理解,本发明不局限于CRR 160中光栅的具体配置,并且针对该光栅选择的精确波长取决于选定的目标波长。图1的现有技术的***20提供用于CRR光栅的波长例子,该波长被选择用于实现1480nm的目标波长。还应该理解,可以使用布拉格光栅以外的其它方法,如周期熔合的光纤耦合器或者薄膜反射器产生嵌套腔体。还应该理解,该CRR可被配置为线形腔体或环形腔体。还应该理解,该CRR可被配置作为激光器工作,或者可以通过去除最后一组反射器并替代地将最终波长的信号注入CRR而将该CRR配置作为放大器工作。
如上所述,上述***的一个优点是可以将振荡器120的输出功率保持足够低,使得可以在振荡器120和放大器140之间***例如隔离器191等构件。例如尾光纤(fiber-pigtailed)隔离器等构件典型地局限于大约10W至20W量级的功率水平,这对应于振荡器120的输出功率的上限。
此外,可以使用其它装置(如波分复用器(WDM)192)来滤除在CRR 160中产生的反向传播的斯托克斯波长。这是因为第一斯托克斯频移的光在掺Yb光纤中可见到离子增益并且因此使振荡器不稳定。另外,具有低功率的振荡器120使得从敏感的高反射器件去除热负荷。
应该理解,可以将上述***100推广以使用包括例如半导体激光器的其它类型的振荡器。图6是示出示例性***200的图,该***200采用低功率半导体激光振荡器220,后面有一串光纤放大器240,所述光纤放大器产生进入最终掺Yb功率放大器245的注入,最终掺Yb功率放大器245的输出发出,进入CRR 260。在图6中,放大器串240被描述为包括三个光纤放大器241-243。应该理解,在实现本发明的各方面时,还可以使用其它类型和数目的放大器。
提供CRR 260的输出作为***输出280。与***100中相同,使用依赖于波长的损耗元件(即WDM 292)和光隔离器291将振荡器220与其它***构件隔离。
图7示出根据本发明的另一方面的光放大方法300的流程图。方法300包括以下步骤:
301:将基于光纤的振荡器、放大器和级联拉曼谐振器(CRR)串联耦合在一起,其中提供振荡器的输出作为进入放大器的输入,其中提供放大器的输出作为进入CRR的泵浦输入,并且其中CRR提供目标波长的单模辐射作为输出。
302:在振荡器和放大器之间连接一个或多个的依赖于波长的损耗元件,由此振荡器与放大器和CRR光隔离。
303:在第一功率水平范围内操作振荡器;在超过第一功率水平范围的第二功率水平范围内操作放大器和CRR。
注意,拉曼增益带宽是相当大的,并且反射器可以位于该增益带宽内的任何地方,不必在增益的峰值处。
上述***和技术可应用于众多其它环境中,包括但不限于:线形和环形拉曼谐振器;拉曼放大器结构;包括第二泵浦的双泵浦***,第二泵浦不与任何一个拉曼腔体谐振,但是仍在拉曼增益带宽内;到达倍频晶体(具有窄线宽的偏振输出对于倍频晶体是有益的);例如在参数***中使用脉冲的或调制的操作;等等。
注意,对于拉曼放大器,它们的结构典型地与拉曼激光器的结构类似,不同之处在于放大器的拉曼腔被构造为没有最后的斯托克斯频移和输出耦合器。另外,还将种子激光器在最后斯托克斯频移耦合到拉曼腔中。来自种子源的种子输入可以在不同位置注入到放大器中。该种子激光器控制多个放大器性质,如偏振输出、窄线宽、可调谐性等。
尽管以上描述包括使本领域技术人员能够实现本发明的细节,但是应该认识到,该描述本质上是说明性的,并且对于受益于这些教导的本领域技术人员来说,对以上描述的许多修改及变化是显而易见的。因此,希望本文中的发明仅由所附权利要求限定,并且应该按照现有技术所允许的那样宽泛地解释该权利要求。
Claims (21)
1.一种光放大***,包括:
串联耦合在一起的基于光纤的振荡器、放大器和级联拉曼谐振器,其中所述振荡器的输出被提供为进入所述放大器的输入,其中所述放大器的输出被提供为进入所述级联拉曼谐振器的的泵浦输入,并且其中所述级联拉曼谐振器提供目标波长的辐射作为输出,以及
依赖于波长的损耗元件,其连接在所述振荡器和所述放大器之间用于防止光从所述放大器和级联拉曼谐振器反向传播进入所述振荡器中,由此所述振荡器可在第一功率水平范围内工作,所述放大器和所述级联拉曼谐振器可在超过第一功率水平范围的第二功率水平范围内工作。
2.根据权利要求1所述的光放大***,还包括连接在所述振荡器和所述放大器之间的光隔离器。
3.根据权利要求1所述的光放大***,其中所述依赖于波长的损耗元件包括波分复用滤波器。
4.根据权利要求1所述的光放大***,其中所述振荡器包括:
具有输入端和输出端的激光激活光纤段;
在光纤段的输入端提供的高反射器件和在光纤段的输出端提供的输出耦合器,其中所述高反射器件、输出耦合器和光纤提供激光器腔体;以及
耦合到所述激光激活光纤的泵浦源,用于向所述激光激活光纤提供泵浦输入。
5.根据权利要求4所述的光放大***,其中所述激光激活光纤是双包层光纤。
6.根据权利要求5所述的光放大***,还包括用于将所述泵浦源耦合到所述双包层激光激活光纤的锥形光纤束。
7.根据权利要求1所述的光放大***,其中所述放大器包括:
具有输入端和输出端的相应一段激光激活双包层放大器光纤,其中所述振荡器的输出被提供为进入所述放大器光纤的输入端的输入;以及
耦合到所述放大器光纤的相应泵浦源,用于放大所述放大器的输入,
其中所述放大器在所述放大器的输出端提供放大后的输入作为输出。
8.根据权利要求7所述的光放大***,还包括用于将所述相应泵浦源耦合到所述放大器光纤的锥形光纤束。
9.根据权利要求7所述的光放大***,其中所述放大器光纤是掺Yb双包层光纤。
10.根据权利要求1所述的光放大***,其中所述级联拉曼谐振器包括:
具有输入端和输出端的拉曼光纤段,其中所述放大器的输出被提供为进入所述拉曼光纤的输入端的泵浦输入,
其中所述拉曼光纤位于谐振腔体内,在所述谐振腔体的输出端具有输出耦合器,并且
其中所述谐振腔体和所述输出耦合器具有波长响应,所述波长响应被配置成在级联拉曼谐振器的输入中产生一系列级联的一个或多个的斯托克斯频移,从而将其波长增加到选定的目标波长,在所述输出耦合器作为输出提供该目标波长。
11.根据权利要求10所述的光放大***,其中所述谐振腔体包括在所述拉曼光纤的输入端的第一多个高反射器件以及在所述拉曼光纤的输出端的第二多个高反射器件和输出耦合器。
12.根据权利要求1所述的光放大***,其中所述振荡器包括半导体激光器。
13.根据权利要求12所述的光放大***,其中所述放大器包括多个光纤放大器和一个掺Yb功率放大器。
14.一种光放大方法,包括:
将基于光纤的振荡器、放大器和级联拉曼谐振器串联耦合在一起,其中所述振荡器的输出被提供为进入所述放大器的输入,其中所述放大器的输出被提供为进入所述级联拉曼谐振器的泵浦输入,并且其中所述级联拉曼谐振器提供目标波长的单模辐射作为输出,
将所述振荡器与所述放大器和级联拉曼谐振器隔离,
由此所述振荡器可以在第一功率水平范围内工作,并且所述放大器和级联拉曼谐振器可以在超过第一功率水平范围的第二功率水平范围内工作。
15.根据权利要求14所述的光放大方法,其中将所述振荡器与所述放大器和级联拉曼谐振器隔离的步骤包括:
在所述振荡器和放大器之间连接光隔离器。
16.根据权利要求14所述的光放大方法,其中将所述振荡器与所述放大器和级联拉曼谐振器隔离的步骤包括:
在所述振荡器和放大器之间连接波分复用滤波器。
17.根据权利要求14所述的光放大方法,其中所述振荡器包括:
具有输入端和输出端的激光激活双包层光纤段;
在光纤段的输入端提供的高反射器件和在光纤段的输出端提供的输出耦合器,其中所述高反射器件、所述输出耦合器和所述光纤提供激光器腔体;以及
耦合到所述光纤的泵浦源,用于向所述光纤提供泵浦输入。
18.根据权利要求14所述的光放大方法,其中所述放大器包括:
具有输入端和输出端的相应一段激光激活双包层光纤,其中所述振荡器的输出被提供为进入所述放大器光纤的输入端的输入;以及
耦合到所述放大器光纤的相应泵浦源,用于放大所述放大器的输入,
其中所述放大器在所述放大器的输出端提供放大后的输入作为输出。
19.根据权利要求18所述的光放大方法,其中所述相应泵浦源通过锥形光纤束耦合到所述放大器。
20.根据权利要求14所述的光放大方法,其中所述级联拉曼谐振器包括:
具有输入端和输出端的拉曼光纤段,其中所述放大器的输出被提供为进入所述拉曼光纤段的输入端的泵浦输入,
其中在所述拉曼光纤段的输入端提供第一多个高反射器件,并且在所述拉曼光纤段的输出端提供第二多个高反射器件和输出耦合器,
其中所述高反射器件和所述输出耦合器具有波长响应,所述波长响应被配置成在所述级联拉曼谐振器的输入中产生一系列级联的一个或多个的斯托克斯频移,从而将其波长增加到选定的目标波长,在所述输出耦合器作为输出提供该目标波长。
21.根据权利要求20所述的光放大方法,其中所述放大器包括多个光纤放大器和一个掺Yb功率放大器。
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