NRZ测试码型的频谱成分

NRZ测试码型的频谱成分NRZ
(11000001010011111010) (NRZ) NRZ PRBS X PRBS NRZ NRZ NRZ ) SONET SDH 223 27 - 1 PRBS (127 2X - 1 PRBS ( ) NRZ

K28.5± 8b10b (PRBS)

(X) 2 X - 1 PRBS ) 8b10b - 1 PRBS ( 840

NRZ

NRZ
NRZ (T b ) ( 1) ( 0) NRZ

NRZ
NRZ (PSD) (a) (b)
1

PSD

NRZ 50% (CID) CID

1

0

( (

s[t] = Acos[2πf0t]) NRZ )
2

delta

Aδ(t) t 0

A

8b10b 8b10b 10 ( ) 8 CID 10 10 (BER) 64b66b BER SONET 64b66b CID SDH ( 1 0 ( n / T) A/T) ( delta *) delta delta 8 A ∑nδ(t - nT) delta T

10



delta delta delta 2 NRZ PSD ( 1) L = nTb ( ( 1a) PSD 0 1)

1a sinc2(f)

6 6

1.25Gbps 2

Tb

3 4 (1110 312.5MHz (1/L) sinc2(f) ) 1.25GHz (1/Tb)

( (

1b) ) ( 1 1c)

1.25Gbps 2.5GHz (2/Tb)

(delta

) sinc 2(f) sin( π f)/( π f) (c) sinc2(f) sinc2(f) (

sinc(f) (b) ) sinc2(f)

20 1.25Gbps (

(K28.5± 4) (1.25GHz 4

) 2.5GHz) 125MHz