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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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design of opsy optical packet synchronizer

Design of OPSy(Optical Packet Synchronizer)

20022037 Kim jinah

20032001 Gang kwanwook

introduction
Introduction
  • What is OPSy (Optical Packet Synchronizer) ?

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

(OPSy).

slide3

High dispersive fiber

High dispersive fiber

2R regeneration

Ch 1

2R regeneration

Signal(1550nm)

Signal(1550nm)

circulator

circulator

2x2 Switch

2x2 Switch

coupler

coupler

WC

WC

WC

WC

DFB LD (1560nm)

DFB LD (1540nm)

DFB LD (1550nm)

DFB LD (1550nm)

Ch 2

Proposed Sync. system

Fiber Delay Loop

slide4

Proposed Sync. system

  • Characteristics of Fiber Delay Loop

Advantages

- Flexible system

: possible to control delay following loop times,

otherwise use fixed delay line in other system

Disadvantages

- 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)

slide5

Sync. system algorithm

  • How’s it proceed

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)

  • Conditions for Sync. System

- 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

slide6

Sync. system condition

IEEE Photonic Technology Letter. Sep. 2002

  • Time slot & packet format
    • Time slot : 1024ns
    • Packet length : 896ns
    • Guard time : 128ns

Packet length

(896ns)

Time slot

(1024ns)

Gurad time (128ns)

slide7

Sync. system algorithm

  • Misalignment of packet

∆t1

Ch 1

Ch 2

Ch 3

∆tn

Ch n

slide8

Sync. system condition

  • DCF condition & Delay

- DCF condition

: Dispersion : -90ps/nm km

: Dispersion slope : 0.21ps/nm2km

- Delay with optical channel (f0 = 193.1THz)

slide9

Sync. system algorithm

  • Wavelength selection
    • If∆tnis larger than the half of packet length (448ns)
      • Accelerate signal
      • 193.6 THz ~ 196. 6 THz
    • If∆tnis smaller than the half of packet length (448ns)
      • Delay signal
      • 192.6 THz ~ 189.6 THz
    • Packet divided by signal channel (the # of fn)

f4

f5

f6

f7

f1

f2

f3

f0

0ns

56ns

112ns

168ns

224ns

280ns

336ns

392ns

448ns

slide10

Sync. system algorithm

  • System specification
    • Time resolution : the half of packet / # of signal channel / 2
      • Ex) 448ns/8/2 = 28ns
    • # of loop circulation : time segment / channel delay
      • Ex) 56ns/ ~360ps = 155.55555
    • Bit rate independent
slide11

Future works

  • Program for optimization
    • DCF condition

: Dispersion per length, dispersion slope etc(signal degradation).

    • Wavelength conversion

: Channel spacing, channel range, # of channel etc.

    • Determine optimized system factor :

: # of ch, Loop length, delay time following wavelength.

Others…