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Design for a Yb-doped CP fiber laser for operating near EDFA absorption band
Design for a Yb-doped CP fiber laser for operating near EDFA absorption band
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机译：设计用于在EDFA吸收带附近工作的掺Y CP光纤激光器
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摘要
A Yb-doped cladding pumped fiber laser includes a reflective grating located at each distal end of the laser cavity. Each reflective grating can reflect light propagating inside a fiber core and at a desired wavelength range. A plurality of band-rejecting gratings are disposed between the reflective gratings, whereby the band-rejecting gratings can couple light at an undesired wavelength range and out of the fiber core. When the band-rejecting gratings are in an end-to-end relationship, they are separated by a distance of approximately L whereby L=[(&sgr;.sub.e. sup.d +&sgr;.sub.a.sup.d)ln 1/T]/[n(&sgr;. sub.a.sup.d &sgr;.sub.e. sup.u -&sgr;.sub.e.sup.d &sgr;.sub.a.sup. u)], n is a concentration of ions subject to excitation, &sgr;.sub.a. sup.d is an absorption cross section at said desired wavelength range, . sigma..sub.e. sup.u is an emission cross section at said undesired wavelength range, &sgr;.sub. e.sup.d is an emission cross section at said desired wavelength range, . sigma..sub.a.sup.u is an absorption cross section at said undesired wavelngth range, and T is a band- rejecting grating transmission factor. The number of band-rejecting gratings is given by N whereby N=d/L≧ dn (&sgr;.sub.a.sup.d . sigma..sub.e.sup.u -&sgr;.sub.e. sup.d &sgr;. sub.a.sup.u)/[&sgr;. sub.e.sup.d +&sgr;.sub.a.sup.d) ln 1/T] and d is the length of the laser.
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机译：掺Y包层抽运光纤激光器包括位于激光腔的每个远端的反射光栅。每个反射光栅可以反射在光纤芯内部并以期望的波长范围传播的光。多个带阻光栅被布置在反射光栅之间，由此带阻光栅可以将不期望的波长范围的光耦合出光纤芯。当带阻光栅处于端对端关系时，它们被隔开大约L的距离，从而L ＝ [（sup.d +＆sup.sup.。 d）ln 1 / T] / [n（＆sgr; .sub.a.sup.d＆sgr.sub.e。sup.u-＆sgr..sub.sup.d＆sgr..sub.a.sup [u）]，n是受到激发的离子浓度， sup.d是在所述所需波长范围内的吸收截面。 sigma.sub.e。 sup.u是在所述不希望的波长范围内的发射截面。 e d是在所述所需波长范围λ1处的发射截面。 σu是在所述不希望的波长范围内的吸收截面，并且T是带阻光栅透射率。带阻光栅的数量由N给出，其中N = d / L＆gE; dn（＆sgr.sub.d。sigma.sub.e.sup.u-＆sgr..sub.d＆sgr .. sub.a.sup.u）/ [＆sgr。 d d ln 1 / T]，d是激光器的长度。
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