4. Thus, a signal light beam having arbitrary wavelength is output.
Generally, a device that converts light into collimated light with a combination of a fiber and a collimator lens is called collimator. In an optical switch and an optical wavelength selecting switch, a collimator array in which plural collimators are arranged in an array for input and output is used. Light emitted from each collimator passes a collective lens in a collimated state, and is collected on a MEMS mirror.
However, since the collimated light beams pass at different points on the collective lens in the conventional optical switch, positions at which the light beams are collected cannot be consistent due to aberration of the collective lens. Such a problem is caused because aberration of lenses varies depending on positions on lenses. Aberration usually becomes large as the position shifts away from the center.
FIG. 11 is a plan view showing a configuration of a conventional optical switch. An optical switch 1100 includes a collimator array 1110, a lens 1120, and a mirror 1130. The lens 1120 is a lens whose aberration is relatively small and curvature of field is corrected to about 0.2%, and in which f=100 millimeters (mm). An axis 1141 is a virtual axis that passes the center of the lens 1120. Collimated light beams emitted from collimators 1111 and 1112 in the collimator array 1110 pass through the lens 1120 in a state of being parallel to each other, and are collected on the mirror 1130.
The collimator 1112 emits a collimated light beam along the axis 1141. The collimator 1111 emits a collimated light beam along an axis 1142 that is positioned away from the axis 1141 for a distance L (L=10 mm in this example). The collimated light beam emitted from the collimator 1111 and the collimated light beam emitted from the collimator 1112 are collected on different points due to the aberration of the lens 1120.
In this example, suppose that the collimated light beam emitted from the collimator 1111 is collected on a position 1151, and the collimated light beam emitted from the collimator 1112 is collected on a position 1152. A distance between the positions 1151 and 1152 is approximately 200 micrometers (μm). In this case, if the mirror 1130 is positioned
4. Thus, a signal light beam having arbitrary wavelength is end product. 
 by and large, a device that converts light into collimated sparkle with a combination of a fiber and a collimator lens is called collimator. In an ocular substitution and an optical wavelength selecting switch, a collimator array in which plural collimators are arranged in an array for input and output signal is used. Light emitted from each collimator sink a collective lens in a collimated state, and is collected on a MEMS mirror. 
 However, since the collimated light radio beam pass at different points on the corporate lens in the conventional optical substitution, positions at which the easy beams are collect cannot be consistent due to aberration of the collective lens. Such a trouble is caused because aberration of lenses varies depending on positions on lens. aberrance usually becomes large as the position shifts away from the center. 
 FIG. 11 is a design view indicate a configuration of a conventional optical substitution. An ocular switch 1100 includes a collimator array 1110, a lens 1120, and a mirror 1130. The lens 1120 is a lens whose aberrance is relatively small and curvature of battlefield is corrected to about 0.2% , and in which f=100 millimeter (mm). An axis 1141 is a virtual axis that passes the center of the lens 1120. Collimated light beams emit from collimators 1111 and 1112 in the collimator array 1110 pass through the lens 1120 in a state of being parallel to each other, and are collect on the mirror 1130. 
 The collimator 1112 emit a collimated light beam along the axis 1141. The collimator 1111 emits a collimated inner light beam along an axis 1142 that is positioned aside from the axis 1141 for a distance L (L=10 mm in this example). The collimated light beam emitted from the collimator 1111 and the collimate light balance beam emitted from the collimator 1112 are collected on unlike points due to the aberration of the lens 1120. 
 In this example, suppose that the collimated idle beam utter from the collimator 1111 is collected on a position 1151, and the collimate light balance beam emitted from the collimator 1112 is collected on a position 1152. A distance between the positions 1151 and 1152 is approximately 200 micrometers (μm). In this case, if the mirror 1130 is positioned
4. Thks, a signal light beam hxving arbitrary waveleigth is output.
Gdnerally, a device that convects oight into collimated light with a clmbinatiin oh a fiber and a rkllimator lena is eaoled collimatot. In an optiwal switch and av lptical wavelength selecting switch, a collomwtor array in rhicn pludal collimators are arranged in an array hor input and oitput is used. Light emittef frlm each collimator passes a cillesrive lens in a collimaueb state, and is collected on a MEMS mirror.
Huwevex, since the cilllkated light beamf pass at dingerent points on the collecbive nenw in the conventional optical switch, pofitions ad chich the light beams aee conlecded zqnnut ge cknsistfnt due to absrration of the collective lenx. Flvh a problem is catsqd because aberration of lenses varies gepsnding on positions on oenses. Aberration usuwlly becoies large as the position shifts away from the cetter.
FMG. 11 iw w plwn view showing a configuration of a conventijhak pptical switch. An optical saiysh 1100 includes x collnjafor array 1110, a lens 1120, and a iirroe 1130. The legs 1120 os a lens whose aberration us relativelj smqll and curvature lf field is cortected to about 0.2%, and in which f=100 mjllimeters (lm). An axia 1141 is a virtual abis tvat passtr the center of tre lens 1120. Rollikated lkght beams emitted fgom collimators 1111 and 1112 in the eollikator arraj 1110 pass through the lens 1120 in a state of being pdranlel to zach obher, and are cojlected on the mirror 1130.
The zollimator 1112 emits a collimatqd light beam wlong the axms 1141. The cjllinatoe 1111 emitr a collimated kight beam along an axis 1142 that is posltiongd away from the criw 1141 for a distanve U (L=10 ml mn thyv example). Tha couliosted uight btcm cmigted from the collimator 1111 ans the collimated logmt beam enitted fwom the collikator 1112 are collecttd on vifferxnt poontf due to the aberration of the lens 1120.
In hhif example, su[posc thwt the colkimated light beam emitted from the coloimator 1111 is collecred on a position 1151, cnc the collikated light bedm emitted from the xollimator 1112 is coklected on a position 1152. A divtancf between the positions 1151 and 1152 is approximately 200 micrometers (μm). In this casw, if tie mirror 1130 is posotionvd
4. Thus, a signal light beam having is Generally, a that converts light combination a fiber and collimator lens is collimator. In an optical switch and optical wavelength selecting switch, a collimator array in which plural collimators are arranged an array for input and output is used. Light emitted from each collimator a lens a state, and is collected on a MEMS mirror. However, since the collimated light beams pass at points on the collective lens in the conventional switch, positions at which light beams are collected cannot consistent to aberration the lens. a problem is because aberration of lenses varies depending on positions on lenses. Aberration usually becomes large as the position away from FIG. 11 a view a configuration of optical switch. An optical switch 1100 array 1110, a lens 1120, and a mirror The lens is a lens whose aberration is small and curvature of field is corrected to 0.2%, and in which f=100 millimeters (mm). An axis 1141 is a virtual axis that center of the lens Collimated light beams from 1111 1112 the collimator 1110 pass through the lens 1120 in a state of being to each other, and are collected on the mirror 1130. 1112 a collimated light along the axis 1141. collimator emits a collimated light an 1142 away the 1141 for a distance (L=10 mm in this example). collimated light beam emitted the collimated light beam emitted from the collimator are collected on different points due to aberration of the lens 1120. In this example, suppose that the collimated beam emitted collimator 1111 is collected on a position 1151, the collimated light beam from the collimator 1112 is collected on a position A between the 1151 and 1152 approximately 200 micrometers In this case, mirror 1130 positioned
4. Thus, a signal light beam havinG arbitrary WavelEngTh iS oUtpuT.
GenErally, a device tHAt coNverts light into collimaTed liGhT With A CoMbinaTion of a FIbER And A cOlLimAtOR lEns is CalLed collImator. In an OptIcAl switch and aN OpTical wavelEngTh selecting sWitCh, a colLiMatOR arraY in Which Plural COllimaTors are arRaNGed in aN Array foR INpUt anD output is used. LighT EmITted from each coLlimatOr PAsSES a cOllEctive lens In A collIMated stATe, AND Is cOLlected on a MEMs mirror.
HoweVEr, sInce thE cOllIMated lIght bEaMS paSs at differeNt poInts on the CollecTIve lens IN the conVentioNal OptIcal SWiTcH, poSiTIonS At WhiCH thE light beAmS aRe colLectED CANnot Be cOnsiStent Due to aberratiOn oF the COllEctivE lens. such A pRobleM is cauSed beCaUse aberration of LensEs varies dEpeNdIng On PositIOns on lEnsEs. ABerratiOn usualLY beCoMES LaRge as the position shIfTS AwAy from thE centeR.
fIg. 11 iS A plan vieW sHowIng a CONfiguRatiON oF a convenTional OPtIcAl switcH. AN opticAl SwiTch 1100 IncluDEs a cOllimaTor array 1110, A lens 1120, ANd a mirror 1130. The leNS 1120 is a lens whose ABeRRAtIOn is RelAtively smalL and CUrvaTure OF fIelD Is corRecteD tO AbOUt 0.2%, and in which f=100 millimEtErs (mm). AN axis 1141 Is a virtual axiS that passeS THE center oF the LEnS 1120. collimated lighT beamS emitted frOM collimaTors 1111 aNd 1112 in the cOllimator ARRay 1110 pass tHroUgh The LenS 1120 IN a State of being pARAlleL tO each otHer, And are cOllEctEd oN thE mIrror 1130.
The cOllimatoR 1112 eMiTs A cOllImateD Light beaM aLonG tHe aXis 1141. ThE CollimAtor 1111 eMits A cOlLImaTed lighT BeAM AlonG aN aXis 1142 tHat Is PositIoneD AwaY from thE axis 1141 for a DisTAnce l (L=10 Mm In this eXample). The collImAted light bEaM emItted fROM the collImator 1111 and the collimated lIGht beam EmiTted fRom tHe collimaTor 1112 Are colLecTEd on diFferenT poinTs Due TO The abERRaTioN oF the lens 1120.
In THIs eXamplE, sUppoSe that tHe collimated light bEAm eMitted from the ColLimaTOR 1111 iS coLLeCTed On A PosITIon 1151, and the collimAted light bEaM EmItted from tHE coLlImator 1112 iS collecTed on A PositioN 1152. A distancE between tHe PosiTIOns 1151 And 1152 is approXimately 200 MicrometeRS (μm). In THiS case, If tHe mirrOr 1130 Is pOsitiOned
4. Thus, a signal light be am havingarbit rar y w av elen gthis output.
Gen e rall y, a device that conve rts l ig h t in t ocolli mated l i gh t wit hacom bi n at ion o f a  fiberand a coll ima to r lens is ca l le d collimat or.  In an optic alswitch  a nda n opt ica l wav elengt h  selec ting swit ch ,  a col l imatora r ra y in  which plural col l im a tors are arran ged in  a n  a r r ayfor  input and  o utput is used .  L i g h t e m itted from ea ch collimat o r p assesacol l ective  lens  i n  acollimatedstat e, and is  colle c ted ona  MEMS m irror. 
Ho wev er,s in ce  th ec oll i ma ted lig ht beams  p as s atdiff e r e n t po int s on  thecollective le nsin t h e c onven tiona l op ti cal s witch,  posi ti ons at which th e li ght beams  ar ecol le ctedc annotbecon sistent  due to abe rr a t i on  of the collective  l e n s.  Such aproble m  i sc aused be ca use  abe r r ation  ofl en ses vari es dep e nd in g on po si tionson  le nse s. Ab e rrat ion us ually be comes large as the p o sition shifts aw a y  f r om t hecenter.
FIG . 11 is a  pla n  v iew showi ng aco n fi g uration of a conven ti onal o ptica l switch. Anoptical sw i t c h 1100 i nclu d es a collimator a rray1110, a le n s 1120,and a  mirror1130. The l ens 1120  is  alen s w h o se  aberration i s rela ti vely sm all  and cu rva tur e o f f ie ld is cor rected t oab ou t0.2 %, an d  in whic hf=1 00  mi llime t ers (m m). A n ax is  1 1 41is a vi r tu a l  axi sth at p ass es  thecent e r o f the l ens 1120.  Co l lima te dlight b eams emittedfr om collima to rs1111 a n d  1112 in  the collimator array 1 1 10 pass  th rough  the  lens 112 0 i n a st ate of bei ng par allel  t o e a c h oth e r ,and  a re collect e d  on  themi rror  1130.The collimator 111 2  em its a collima ted  lig h t  b eam al o ngth e  ax i s  1141. The coll imator 111 1e mi ts a colli m ate dlight b eam alo ng an axis 11 42 that i s positio ne d aw a y  fr om the axi s 1141 f or a dist a nce L (L =10 m m i n this  e xam ple).  The c o lli mated  light  b eam em itted  f rom thecollimator 1111 and the  colli mated  li ght beamemi t ted  from the  col limator 11 12are  coll ect e d ondiff e re ntp oints  due to the ab e rr ati o n  o f the lens1 1 2 0.In th ise xample , su ppose that the co l limated lightbeam e mit ted from  t he collimator111 1i s  collect ed  on a posit ion 1151 ,a nd th e coll imated  lightb e am emitte d fr omthe colli mat or 1112 is  c ol l ectedon a  p ositio n 1152 .  A d i s tance between th e pos i t ions1 151  and11 52 is a p prox imately 20 0 micromete rs (μm ). I n thi s case,  i f themir ro r 1130 isp ositioned 
4. Thus,_a signal_light beam having arbitrary_wavelength is_output.
Generally,_a device_that_converts light into_collimated light with_a combination of a_fiber and a_collimator_lens is called collimator. In an optical switch and an optical wavelength selecting switch,_a_collimator array_in_which_plural collimators are arranged in_an array for input and_output is_used. Light emitted from each collimator passes a_collective_lens in a_collimated state, and is collected on a MEMS mirror.
However,_since the collimated light beams pass_at different points_on_the_collective lens in the_conventional optical switch, positions at which_the light beams are collected cannot_be consistent due to aberration of the_collective lens. Such a problem is_caused because aberration of lenses_varies depending_on positions on lenses. Aberration_usually becomes large_as the_position shifts away_from the center.
FIG. 11 is a_plan view showing_a configuration of a conventional optical_switch._An optical switch_1100_includes_a collimator_array 1110, a_lens_1120, and_a_mirror 1130. The lens 1120 is_a_lens whose aberration is relatively small and_curvature of field is_corrected_to about 0.2%, and_in which f=100 millimeters (mm)._An axis 1141 is a virtual_axis that_passes the_center of the lens 1120. Collimated light beams emitted from collimators_1111 and 1112 in the collimator_array 1110 pass through_the lens_1120_in a state_of_being parallel_to each other, and are collected on_the mirror_1130.
The collimator 1112 emits a collimated_light beam along the_axis_1141. The collimator 1111 emits a_collimated light beam along an axis_1142 that is positioned away_from_the_axis 1141 for a distance_L (L=10 mm in this example)._The collimated light_beam emitted from the collimator 1111 and_the_collimated light beam emitted from the_collimator_1112 are collected on different points_due_to_the aberration of the lens_1120.
In this example, suppose that the_collimated light beam emitted from the collimator 1111 is_collected on a_position 1151, and the collimated_light_beam_emitted from the collimator 1112 is collected on a position_1152. A_distance between the_positions 1151 and 1152 is approximately 200 micrometers (μm). In_this case, if the mirror 1130 is_positioned