
The present invention relates to an optical switch that switches communication paths in an optical communication system, and a lens adjusting method and a lens adjusting device for the optical switch.
2. Description of the Related Art
In the third generation optical communication system (multi-ring network), because of its large communication amount, an enormous amount of work is required if replacement of fiber codes and setting of wavelength are performed manually when communication paths are switched. Therefore, an optical switch (for example, Japanese Patent Laid-Open Publication No. 2004-70053) or an optical wavelength selecting switch (for example, U.S. Pat. No. 6,549,699) that enables flexible change of paths and a remote operation is used.
FIG. 9 is a perspective view showing a configuration of a conventional optical switch. Signal light input from an input port 911 is collimated by a lens 921, and is collected on a micro electro mechanical systems (MEMS) mirror 940 by a lens 903.
The signal light collected on the MEMS mirror 940 is reflected by the MEMS mirror 940 and passes through the lens 930 and a lens 924 to be collected at an output port 914. The signal light is then output from the port 914. An optical switch controls an angle θy of the MEMS mirror 940, thereby selecting a desirable output port from which the signal light is to be output, from among output ports 912 to 914.
FIG. 10 is a perspective view showing a configuration of a conventional optical wavelength selecting switch. Wavelength division multiplexing (WDM) light that includes plural signal light beams having different wavelengths is input from an input port 1011. The WDM light is collimated by a lens 1021 and is reflected by a light dividing device 1030 such as a diffraction grating, being divided into light beams of respective wavelengths. The reflected light beams are collected on plural mirrors (not shown) in a MEMS mirror 1050, respectively.
The signal light beams collected on the respective mirrors in the MEMS mirror 1050 are reflected from the MEMS mirror 1050 to pass through the lens 1040, and reflected by the light dividing device 1030 again. The reflected light beams are collected at output ports 1012 to 1014, respectively. The optical wavelength selecting switch controls the angle of each of the mirrors in the MEMS mirror 1050 to output each of the divided light beams to a desirable output port from among the output ports 1012 to 101
The present invention relates to an optical switch that switches communication path in an ocular communication system, and a lens adjusting method and a lens align device for the optical switch. 
 2. Description of the Related Art 
 In the third genesis ocular communication system (multi - ring net), because of its big communication amount, an enormous sum of work is required if refilling of fiber code and setting of wavelength are performed manually when communication way are switched. Therefore, an optical substitution (for example, Japanese Patent Laid - Open Publication No. 2004 - 70053) or an optical wavelength selecting substitution (for example, U.S. Pat. nobelium. 6,549,699) that enables flexible change of paths and a remote operation is use. 
 FIG. 9 is a perspective view showing a configuration of a conventional ocular switch. Signal light input from an input port 911 is collimated by a lens 921, and is collected on a micro electro mechanical systems (MEMS) mirror 940 by a lens 903. 
 The signal light collected on the mem mirror 940 is reflect by the MEMS mirror 940 and die through the lens 930 and a lens 924 to be gather at an output port 914. The signal light is then end product from the port 914. An optical switch controls an slant θy of the MEMS mirror 940, thereby selecting a desirable output port from which the signal light is to be output, from among output ports 912 to 914. 
 FIG. 10 is a perspective view showing a configuration of a conventional ocular wavelength selecting switch. Wavelength part multiplexing (WDM) light that includes plural signal light beams having unlike wavelengths is input from an input port 1011. The WDM light is collimated by a lens 1021 and is reflected by a light dividing device 1030 such as a diffraction grate, being divided into light radio beam of respective wavelengths. The reflected unaccented beams are collect on plural mirrors (not show) in a MEMS mirror 1050, respectively. 
 The signal light beams collected on the respective mirrors in the MEMS mirror 1050 are reflect from the MEMS mirror 1050 to exceed through the lens 1040, and reflected by the light dividing device 1030 again. The reflected light beams are roll up at output ports 1012 to 1014, respectively. The ocular wavelength selecting switch manipulate the angle of each of the mirrors in the MEMS mirror 1050 to output each of the divided faint beams to a desirable output port from among the output ports 1012 to 101

The present invention relatts to an optical switch vhat swjtches cummunication paths in an optmcal commynication system, and a lens adjlsting merhod qnd a lens adjustiky devjge fox vhe optical swijch.
2. Descripthon of the Reldtdd Art
In the third generation optical communocwtion system (molti-rpnd nefwork), because of its large communidation emount, an enormpus amount of work is requlred if replacement of fiber codew anq setting of davelength are performgd manually when communication pxths cre switchee. Rheggfore, an optmcal sritch (for example, Ja[anese Latent Laid-Opek Pubnicqtion No. 2004-70053) or an opticel wavelength selectyng switcv (yor example, U.S. Pat. No. 6,549,699) rhat gnablas fuwxicle cianfe of oatis and a rejote operatuon is used.
FIG. 9 is s [vtspective visw shorigg a configuration of a conventional opuical switch. Signal light input from an input porj 911 is collymated by a lens 921, and is collected on a micro elewtro jdchcklcal wydtems (MEMS) mirror 940 by a lens 903.
The signal light doklvcted on the MEMS mirror 940 is rffkgcted by the MGMS mirxkr 940 and passes throuhh the jens 930 and a legs 924 yo be collected at an outpur port 914. The fugnal light is theu output froo thg port 914. An optical switch concrols zn angle θy lf the MEJR mirror 940, therebh svlecding a dtrirable output powt from wiich che signxl loght if to be ouhput, nsom among output plrts 912 tm 914.
FIG. 10 is w perspective view showing a coihiguration of a cotventioncl optlcal wavelength selecting swijch. Wavelzngth aivision mlltiplexiig (WDM) light that includev plural signel light feamw hacing diwwerent wavelenbths is iukut from ab input port 1011. The XDM ujght is collimactd vy a lens 1021 and os fefjebtev by w light dividhng aevkve 1030 sjch as a dinfrxctipn grating, being divhded into light beams pf respectuve wavejengths. The rrflected light beals arx collxcted pn klural mirrors (not shown) in a MSMS mirrog 1050, vespectively.
Tre slgnaj light becms collected on the respective mirrors mn the MEMS mirror 1050 arg reflected from the KTMS mirror 1050 tp pasf through the lens 1040, and reflexted by the light dividing device 1030 agajn. The reflfcted light beams are collected at output ports 1012 to 1014, respectively. The optucal wevqlength selsctimg swptck cpntrolf thx engle of each of nhe mirrors in the MEMS mirror 1050 vo output aaeh of the divided light beams tu a desirable output port from among fhe outpit ports 1012 to 101
The present invention relates to an optical switches paths in optical communication system, and lens adjusting device the optical switch. Description of the Related Art In third generation optical communication system (multi-ring network), because of its large communication amount, enormous amount of work is required if replacement of fiber codes and setting wavelength performed when paths are switched. Therefore, an optical switch (for example, Japanese Patent Laid-Open Publication No. 2004-70053) or optical wavelength selecting switch (for example, U.S. Pat. 6,549,699) that enables flexible of paths and a remote is FIG. 9 a view a configuration of conventional optical switch. Signal light input from an input port 911 is collimated by a lens 921, is collected micro electro systems mirror by a lens signal light collected on the MEMS reflected by the MEMS mirror 940 and passes the lens and a lens 924 to be at an output port 914. The signal light then output from the port 914. An optical switch controls an angle θy of the 940, thereby selecting a output port from the light to output, from output ports 912 to 914. FIG. 10 is a perspective view a configuration of a conventional optical wavelength selecting switch. Wavelength (WDM) that includes plural light beams having different is from an input port WDM is lens and reflected by a light device 1030 such as a grating, being divided into The reflected light beams are collected on plural (not shown) in a MEMS mirror 1050, The signal light beams collected on the respective mirrors in the MEMS 1050 are the MEMS mirror 1050 to pass through the 1040, and reflected by light dividing device 1030 again. The reflected light beams collected output ports to 1014, respectively. optical wavelength selecting controls the angle of the in MEMS output each of the divided light to desirable output port from among output to 101

The present invention relateS to an opticAl swiTch ThaT sWitcHes cOmmunication paTHs in An optical communication SysteM, aND a leNS aDjustIng methOD aND A leNs AdJusTiNG dEvice For The optiCal switch.
2. DEscRiPtion of the ReLAtEd Art
In the ThiRd generation OptIcal coMmUniCAtion SysTem (muLti-rinG NetworK), because oF iTS large COmmunicATIoN amoUnt, an enormous amouNT oF Work is required If replAcEMeNT Of fIbeR codes and sEtTing oF WavelenGTh ARE PerFOrmed manually When communiCAtiOn pathS aRe sWItched. thereFoRE, an Optical switCh (foR example, JApanesE patent LAId-Open PUblicaTioN No. 2004-70053) Or an OPtIcAl wAvELenGTh SelECtiNg switch (FoR eXamplE, U.S. PAT. nO. 6,549,699) That EnaBles FlexiBle change of paThs And a REmoTe opeRatioN is uSeD.
FIG. 9 iS a persPectiVe View showing a conFiguRation of a ConVeNtiOnAl optICal swiTch. sigNal lighT input fROm aN iNPUT pOrt 911 is collimated by a LeNS 921, AnD is colleCted on A MiCrO Electro mEcHanIcal SYStems (mEMS) MIrRor 940 by a leNs 903.
The sIGnAl Light coLlEcted oN tHe MeMS MirroR 940 Is reFlecteD by the MEmS mirROr 940 and passes thrOUgh the lens 930 and A LeNS 924 To BE colLecTed at an outpUt poRT 914. The SignAL lIghT Is theN outpUt FRoM The port 914. An optical swiTcH contrOls an Angle θy of the MeMS mirror 940, tHEREby selecTing A DeSIrable output poRt froM which the sIGnal lighT is to Be output, From among OUTput portS 912 to 914.
fIG. 10 Is a PerSPEcTive view showiNG A conFiGuratioN of A convenTioNal OptIcaL wAvelength SelectinG sWiTcH. WAveLengtH Division MuLtiPlExiNg (WDM) LIght thAt incLudeS pLuRAl sIgnal liGHt BEAms hAvInG difFerEnT waveLengTHs iS input fRom an inpuT poRT 1011. The wDm lIght is cOllimated by a lEnS 1021 and is reflEcTed By a ligHT Dividing Device 1030 such as a diffractioN Grating, BeiNg divIded Into light BeaMs of reSpeCTive waVelengThs. ThE rEflECTed liGHT bEamS aRe collecteD ON plUral mIrRors (Not showN) in a MEMS mirror 1050, respECtiVely.
The signal LigHt beAMS cOllECtED on ThE ResPECtive mirrors in tHe MEMS mirrOr 1050 ARe Reflected fROm tHe mEMS mirRor 1050 to paSs thrOUgh the lEns 1040, and refLected by tHe LighT DIviDing device 1030 Again. The Reflected LIght bEAmS are cOllEcted aT oUtpUt porTs 1012 to 1014, reSPecTivelY. The opTiCal wavElengTh SelectinG switch controls the angle Of each Of the MirRors in the mEMs MirRor 1050 to outpUt eaCh of the divIdeD liGht beAms TO a desIrabLE oUtpUT port From AMong the ouTPuT poRTS 1012 tO 101

The present invention rel ates to an  opti cal  sw it ch t hatswitches commu n icat ion paths in an optica l com mu n icat i on  syst em, and al e nsad ju sti ng me thodand  a lens  adjusting  de vi ce for the o p ti cal switch .
2 . Descriptio n o f theRe lat e d Art 
In  thethirdg enerat ion optic al commun i cations y st em ( multi-ring networ k ), because of its  large  c o mm u n ica tio n amount,an  enor m ous amo u nt o f  wo r k is required  if replace m ent  of fi be r c o des an d set ti n g o f wavelengt h ar e perform ed man u ally wh e n commu nicati onpat hs a r esw itc he d . T h er efo r e,an optic al  s witch  (fo r e x ampl e,Japa nesePatent Laid-O pen  Pub l ica tionNo. 2 004- 70 053)or anoptic al  wavelength sel ecti ng switch  (f or  ex am ple,U .S. Pa t.No.  6,549, 699) th a t e na b l e sflexible change of  p a t hs  and a r emoteo pe ra t ion is u se d.FIG. 9  is a  per s pe ctive vi ew sho w in ga confi gu ration  o f a  co nvent i onal  optic al switc h. Si g nal light inpu t  from an inpu t  p o r t9 11 i s c ollimated b y al ens921, an d i s  coll ected  o n  a micro electro mecha ni cal sy stems  (MEMS) mirro r 940 by a l e ns 903.Thes ig n al light colle ctedon the MEM S  mirror940 i s reflec ted by th e MEMS mir ror  94 0 a ndp a ss es through th e lens  9 30 anda l ens 924  to  be  co lle ct ed at anoutput p or t91 4.  Th e sig n al light  i s t he n o utput from t he po rt 9 14 .A n o pticals wi t c h co nt ro ls a n a ng le θy  oft heMEMS mi rror 940,  th e reby  s el ectinga desirable o ut put port f ro m w hich t h e  signallight is to be output,f rom amo ngoutpu t po rts 912 t o 9 14.
FI G.1 0 is a  persp ectiv evie w showi n g  a  co nf igurationo f  aconve nt iona l optic al wavelength sele c tin g switch. Wav ele ngth d iv isi o nm ult ip l exi n g  (WDM) light th at include sp lu ral signal lig ht  beamshavingdiffe r ent wav elengthsis inputfr om a n inp ut port 10 11. TheWDM light is co l li mated  by  a len s102 1 and  is re f lec ted b y a li gh t divi dingde vice 103 0 such as a diffraction  grati ng, b ein g divided  in t o l ight beam s of  respectiv e w ave lengt hs. The r efle c te d l i ght b eams are colle c te d o n pl ural mirror s ( not  show n)i n a ME MS m irror 1050, respe c tively.
The si gnal l igh t b e amsco llected on the  re sp e c tive mir ro rs in the M EMS mirr or 1050are re flecte d fromt h eM EMS mi rror  10 50 to pas s t hr o ugh the  l en s  1040,  and  r eflect ed byt he l i g ht dividing devi ce 10 3 0  agai n . T he re fl ected l i ghtbeams arecollected a t outp ut p orts1012 to  1 014, r esp ec tively. Th e  opticalwavel ength s el ecti ngswitch  con t r ols t he a ng leof each o f th e  m ir r ors  inthe M EM S mi rror 1050 to outpu t e a ch of t he  di v i ded li g ht b eams to ades irabl e output por t  fro m  a m ong t he out put po rts 101 2  to  1 01

The present_invention relates_to an optical switch_that switches_communication_paths in_an_optical communication system,_and a lens_adjusting method and a_lens adjusting device_for_the optical switch.
2. Description of the Related Art
In the third generation optical communication system_(multi-ring_network), because_of_its_large communication amount, an enormous_amount of work is required_if replacement_of fiber codes and setting of wavelength are_performed_manually when communication_paths are switched. Therefore, an optical switch (for example,_Japanese Patent Laid-Open Publication No. 2004-70053)_or an optical_wavelength_selecting_switch (for example, U.S._Pat. No. 6,549,699) that enables flexible_change of paths and a remote_operation is used.
FIG. 9 is a perspective_view showing a configuration of a_conventional optical switch. Signal light_input from_an input port 911 is_collimated by a_lens 921,_and is collected_on a micro electro mechanical systems_(MEMS) mirror 940_by a lens 903.
The signal light_collected_on the MEMS_mirror_940_is reflected_by the MEMS_mirror_940 and_passes_through the lens 930 and a_lens_924 to be collected at an output_port 914. The signal_light_is then output from_the port 914. An optical_switch controls an angle θy of_the MEMS_mirror 940,_thereby selecting a desirable output port from which the signal light_is to be output, from among_output ports 912 to_914.
FIG. 10_is_a perspective view_showing_a configuration_of a conventional optical wavelength selecting switch._Wavelength division_multiplexing (WDM) light that includes plural_signal light beams having_different_wavelengths is input from an input_port 1011. The WDM light is_collimated by a lens 1021_and_is_reflected by a light dividing_device 1030 such as a diffraction_grating, being divided_into light beams of respective wavelengths. The_reflected_light beams are collected on plural_mirrors_(not shown) in a MEMS mirror_1050,_respectively.
The_signal light beams collected on_the respective mirrors in the MEMS_mirror 1050 are reflected from the MEMS mirror 1050_to pass through_the lens 1040, and reflected_by_the_light dividing device 1030 again. The reflected light beams are_collected at_output ports 1012_to 1014, respectively. The optical wavelength selecting switch controls the_angle of each of the mirrors in_the MEMS mirror 1050 to output each of the divided light_beams to a desirable output port from among_the output ports 1012 to 101