ECOC 1975 - ECOC 2013

189
Figure 3 shows that the optical average power necessary for a 10-9 error
rate is approximately -50 dBm at the input of the repeater. Figure 4
shows the eye diagram at the decision point in the intermediate repeater.
CONCLUSION
A digital video transmission system with an intermediate repeater using
fibre cable was developed. An experimental result suggests that optical
fibre transmission systems with regenerative repeaters will be useful in
short or middle haul transmission links.
ACKNOWLEDGMENT
The authors wish to thank their colleagues in Electrical Communication
Laboratories in NTT for their 6uggestions.
REFERENCES
(1) T. Sakashita et al.,
"Application of Fiber Cable
Transmission Systems to
Telecommunication Networks,"
Topical Meeting on Optical
Fiber Transmission Conf.,
7-9 Jan. 1975, Williamsburg,
Virginia.
(2) K. Oosawa et al., " A
Consideration of Optical
Fiber Transmission System,"
Paper of the Technical Group
on Communication System,
IEeE, Japan, CS74-67, 1974.
(3) P. K. Runge.," A 50 Mb/s
Repeater for a Fiber Optic
PCM Experiment, " ICC '74
Conf., 17-19 June 1974,
Minneapolis, Minnesota.
(4) " Optical Waveguide
Transmission Systems," CCITT
Del. Contr., GM/SGO-B and
GM/SGO-C, Kyoto Meeting, 1975.
TABLE 1 SYSTEM PARAMETERS
Clock Rate 32.064 Mb/s
Over All Error
Rate
10-9
Transmission RZ Unipolar
Code
Video Coding 4 bit/word DPCM
Pre-amp. Transfer Impedance Amp.
Front End using Bipolar
Transistor
Opt.ical Source Output Power(Peak):-13dBm
(GaAs-LED) (Into the Fibre Cable)
Optical Detector Quantum Efficienoy: 0.59
(Si-APD) Excess Noise Factor: 2.5
Break Down Voltage: 85V
Fibre Cable Loss · 8dB,/km
Index Profile · Step
N. A.
•
· 0.14
Diameter ·
Core
Clad
: 85fAm
· 125fm
Fibre Connector Connecting Loss: 0.9dB
·
·