[转帖]An 8-skip-0 WDM filter

xx_912

An 8-skip-0 WDM filter is capable of adding or dropping 8 channels of a 100-GHz spacing fiberoptic telecommunication system. The design we present has the following specifications:
0 b8 |8 A0 C- c  ?" I1 C8 d# Z<UL>
<LI>centered at 1550 nm,
<LI>passband width of 6.0 nm at the -0.5 dB (about 89%) transmission level,
<LI>bandwidth of 6.8 nm at the -25 dB (about 0.3%) transmission level,
<LI>0.1% ripple in the passband
<LI>materials H (index 2.065) and L (index 1.47) </LI></UL>
: T* T' Q$ E. i9 s8 R% Y% Y<>TFCalc 3.5 has the capability of designing narrow bandpass (NPB) filters using the prototype method. To obtain the steep edges required in this design, we used 13 cavities. After a few minutes, TFCalc produced a design whose performance is shown below.
5 d6 q0 y1 k; d% O. R  \) W<>
0 ]1 R* @; q' |: s8 r< align=center><IMG src="http://www.sspectra.com/designs/8-skip-0.gif"> </P>The design's width at the -25 dB level is 6.7 nm, which is better than required. The stack formula for this 303-layer design is <RE>HLHLHLHL 3H
2L
! Q- U5 t$ C# g/ B/ @5 }8 yHLH 3L HLHLHL 3H LHLHLHL 3H LH
2L
. y) c0 m) k( i/ `3 d' f6 J1 XHLHLHLH 3L HLH 3L HLHLHLH 3L HL 3H
. K* |4 M2 a- p2L
) N4 D4 |5 `8 c- ~3H LHLHLH 3L HLH 3L HLHLH 3L HLHL 3H
7 O( _1 B# A! T; t; S' t2L
H 3L HLHLHLH 3L H 3L HLHLHLHLH 3L 3H
2 A, H' {" R3 k* Q' m2L
& T* H$ Z* U. n9 E! `! F4 }3H LH 3L HLHLHLH 3L HLHLH 3L HLHL 3H
9 c3 \6 j. T# `( \. M2L
- u- V% N7 g9 d- I0 R7 {& E3H LHLHLHLHLH 3L HLH 3L HLHL 3H L 3H
2L
3H L 3H LHLH 3L HLH 3L HLHLHLHLHL 3H
2 q3 v+ ]/ q3 f- c3 B4 @2L
3H LHLH 3L HLHLH 3L HLHLHLH 3L HL 3H
2L
4 O2 a9 R4 B  c( S" Z9 F3H 3L HLHLHLHLH 3L H 3L HLHLHLH 3L H
2L
3H LHLH 3L HLHLH 3L HLH 3L HLHLHL 3H
  f! V* G2 Z( v2 b. ^2L
3H LH 3L HLHLHLH 3L HLH 3L HLHLHLH
2L
HL 3H LHLHLHL 3H LHLHLH 3L HLH
* Y6 ?9 Y! z* s( f1 a+ B2L
3H LHLHLHLH
</PRE>

kaixinkele

高手，我怎么看不懂，请搞通俗一点吗。

opto-tech

http://www.opto-tech.com/read.php?tid=77

rotarynife

高手，我怎么看不懂，请搞通俗一点吗。

lzh1234