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Fiber

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Academic year: 2021

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(1)

                 

(2)

#$% '(

*   +  ,      - . +             /

0         +   1          /

      -  . +      23    /  /

µ

     /

                        -  . +   54      +     +           1      -           +          /

(3)

         +                     1            +         -        /

       -           -   +                       -              /

,                     +                          7 0    198  *  :    ; /

(4)

#$% '(

:     <   =     >    ?    2 <       8     >                          +   +       4    -@ A      7 /  /     +  ;      +     B    1 A -      -       7  +   +          ; B   +      <    1                         / A    +       +    + C     -             / A    +     D             /

(5)

              /

                     +                  4      +                   <          B         /

          +                        1        -          +                +           4                /

(6)

FG $ I

        +       /

     +  /

         /

= +     -   +         /

    :         = +   /

(7)

   -+ +  -         /

(8)

TU W XZY [ I F \ $ ' N ( [ I # ] *       @

^         ^  

^      . +   0    

     3   _    

 ,   =    `    

(9)

:   +    -      :    -   

  +   -           

_    +                 + 

^   

(10)

      

= +      B    C +   7      3  ;

_    +     -    

                  

 +        C  

b               7          ;

(11)

i    ? 2 3                               i -

µ

  i /  j j j

µ

 k  / j j j l

(12)

N W F N N Q T U W *               -           -   +              B   -    /       -             +    B         B              +   1             +         B     p          + -   -        /

(13)
(14)

7 ;    +                 -       , -   +       / 7  ;        -      +                             @

sin(θ

0

) =

n

2

n

1

=

s

ξ

r2

ξ

r1

   

n

1

n

core

=

ξ

r1

 

n

2

n

core

=

ξ

r2

     -      4  ,              -                    +         /

(15)

          1                          +            /                      1            p      <           +  / o % $ I h     +  +     + +                   -     -      ,                             /

(16)
(17)

^         <      u          -                                     B   /_           +            v                    -         B        4     +       +  /

^     +         B          

θ

i

      -           u         -                 B     +   

θ

r

   <     u          -        

θ

/    -  1 -       7xw 

o

4

θ

r

;  ,     . +        

θ

c

1                       p     /

θ

i

    -  1          +                     +         B   /

    -  1     +              +  -  -       ,        -           @

(18)

n sin θ

i

= n

core

sin θ

r

= n

core

sin(90

o

− θ

c

)

= cos θ

c

= n

core

sin(1 − sin

2

θ

c

)

1/2

       1 p           B    @

sin θ

c

=

n

clad

n

core

   - @

n sin θ

i

= n

core

s

1 −



n

clad

n

core



2

(19)

=

q

n

2

core

− n

2

clad

  

N A = n sin θ

i

    -  @

N A =

q

n

2

core

− n

2

clad

(20)

N W             -      ,              -      / `     +    -   . +    B   / 2   . +    B      +   -     7 ?     ;                 /

(21)

\ W " H | ) I} % e I h            1 +   ,         + -  +  +            -  / sG $") } % e I ^ h   ,         + -  +  1 +                         / T ( & e I e " H e I~ h *                     +      / ?  +        -       , /

(22)

=  b     =       b     *    +    7

µ

 ; 7

µ

 ; 7  0 u <  ;        j i    / € +     i        ?    :   , €  i  € €

(23)

 7 u ; _    ?     i         ?     - ^    j   ` + _    i      7     ;  / €

(24)

e I %# % \ ( | ( $ %

                      

T E

11

H

11

  

            +       +  

T E

11

  

(25)
(26)

F W W W                B          -  j        @

*             

            -            

      -      +       

(27)

     /     i / ‚  

(28)

\

                +-    - -  . +  

` +    1      -     - -  . +    „ƒ       +  ƒ     +                 -    …    -  . +       

        B   ,                +      B   /

(29)

N FU T F F

     v        - +            B         +     B                      + -   -    +  /

(30)

        <     +               -     /

`           +                -   B   1   

(31)

+    + v             +    +  - +    B   /

     +      C         @

η

f

=

N A

2

f

N A

2

e

(32)

        +           +   @ i /                           : /                         7  ^ b ; 1     -   B            4       /                    +              - +         -         u ^ b      B   / 2    1       -                 +         /

(33)

TU W W *            +                    +            . +                         @ ,  v  -         +     +        

(34)
(35)

F \ $ '( % W G ' I # % | W \ I I e ( # # % #

                              1          -                /

^ b     +                           /

(36)

F \ $ '( I ' I ‡ I #

         …                     +    - 2 3 /

:ˆ `    u               -                       -    / =       /

(37)

F

\

(38)

G $G I I e # F \ $ '( W ‰ #$ I #

                 …                                 -               +      /

                   @               <                            <       /

(39)

W % $% Q ( ‡ I # ( e % f % # % \ ( | ( $ %  0 b +     -           /

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