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20022037 Kim jinah 20032001 Gang kwang wook

Design of OPSy (Optical Packet Synchronizer). 20022037 Kim jinah 20032001 Gang kwang wook. What is OPSy (Optical Packet Synchronizer) ? In an asynchronous optical network system, each transmitter node sends out optical packets

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20022037 Kim jinah 20032001 Gang kwang wook

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  1. Design of OPSy(Optical Packet Synchronizer) 20022037 Kim jinah 20032001 Gang kwang wook

  2. 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). Introduction

  3. Fiber Delay Loop 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

  4. IEEE Photonic Technology Letter. Sep. 2002 ∆t1 Freq 1 Packet length (896ns) Freq 2 •Misalignment of packets (12 frequency) Freq 3 … … ∆tn Time slot (1024ns) Freq 12 Guard time (128ns) Sync. System algorithm Sync. System conditions - Testing 1 channel with 12 frequency - Time slot & packet format • ·Time slot : 1024ns • · Packet length : 896ns • · Guard time : 128ns - DCF condition • · Delay : 1.26ns/km • · Dispersion : -90ps/nm km • · Dispersion slope : 0.21ps/nm2km • How’s it proceed • - 12 optical packet generate randomly • - Aligning Optical packets in ascending order • - Calculating proper guard times each packets • - Finding 12 optical packets delay times • - Finding # of circulating fiber loop • - Calculating the efficiency of signal channel on 12 optical packets

  5. Results of programming (using C Language)

  6. Delay : ~250ns Results of simulation (using VPI simulation tool and origin ) - Delay result of signal after passing DCF: 1km / 100km

  7. Results of simulation (using VPI simulation tool and originPro6.1 ) BER vs. SOA current (“Optimum value:200mA”) BER vs. Input power (“Optimum value:6dBm input power”)

  8. 20km 50km 100km 20km 50km 100km Results of simulation (using VPI simulation tool and originPro6.1 ) - Signal Distortion in DCF - Signal Dispersion in DCF : Problems of Dispersion and Distortion effect - Using some modified sync. System : Using filter and SOA

  9. DCF SOA 2x2 switch coupler Signal Optical Filter Results of simulation (using VPI simulation tool and originPro6.1 ) - BER measurement (SOA) - Modified Sync. System Input power : 5dBm SOA current : 200mA Loop delay time : 100ns With Bandpass filter

  10. Results of simulation (using VPI simulation tool and originPro6.1 ) - BER measurement (No filter) - BER measurement (with filter) Input power : 5dBm SOA current : 200mA

  11. Results of simulation (using VPI simulation tool and originPro6.1 ) - BER test (2.5Gb/s modulation) - BER test (10Gb/s modulation)

  12. Discussion 1st - 1.26ns/km delay for the DCF - timeslot of 1024ns - total fiber length = 92~km (very rough calculation) Very large volume !! 2nd - Optimum power of 5dBm - Optimum SOA current of 200mA - With bandpass filiter (very rough calculation) BER of 10Gb/s modulation is not so bad But, BER of 2.5Gb/s modulation is so bad

  13. After term project • We adopted many algorithms such as random and sort to implement OPSy, • although this topic is not directly related to Concrete Mathematics. • Optical Network is coming up topic in Management field. Therefore, what we done is • helpful to understand new technology and make more efficient decision. • We focus on the studying and planning before mid-term presentation. • After mid-term presentation, we focus on the real implementation. • We finished implementing the Optical Packet Synchronizer. But We didn’t check • up the efficiency of this algorithm. It will be our further works.

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