Design of OPSy (Optical Packet Synchronizer). 20022037 Kim jinah 20032001 Gang kwanwook. Introduction. What is OPSy (Optical Packet Synchronizer) ? In an asynchronous optical network system, each transmitter node sends out optical
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20022037 Kim jinah
20032001 Gang kwanwook
In an asynchronous optical network system, each transmitter node sends out optical
packets asynchronously. The electric control systems for switching these packets at an
optical packet switching node(OPSw) are much simpler when incoming packets are
aligned in a series of common time slots provided at the OPSw.
This alignment call, which is also called packet synchronization, is a key technology
for the development of OPSw, and it achieved using an optical packet synchronizers
High dispersive fiber
DFB LD (1560nm)
DFB LD (1540nm)
DFB LD (1550nm)
DFB LD (1550nm)
Proposed Sync. system
Fiber Delay Loop
- Flexible system
: possible to control delay following loop times,
otherwise use fixed delay line in other system
- It needs two switches and delay lines per one channel
: generate crosstalk and signal degradation
: use amplifier to compensation
- Total latency is high (determine latency following loop numbers)
: total times to rotation of signal(ns-us), switching times(~ms)
Packet signal generation : Random packet generation >> Examine packets : Sorting algorithm >> Delay : If_else statement >> Circulation : For Loop >> pass Loop >>analysis of results
(NW socket programing under UNIX circumstance using C++ compiler)
- How many channel is efficient to satisfy high speed?
- Proper range of using wavelength range under physical Fiber Delay Loop
- Proper fiber loop length
- How many times circulate fiber Loop to align packet synchronously
IEEE Photonic Technology Letter. Sep. 2002
Gurad time (128ns)
- DCF condition
: Dispersion : -90ps/nm km
: Dispersion slope : 0.21ps/nm2km
- Delay with optical channel (f0 = 193.1THz)
: Dispersion per length, dispersion slope etc(signal degradation).
: Channel spacing, channel range, # of channel etc.
: # of ch, Loop length, delay time following wavelength.