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Lesson 8: Dispersion compensation using subsystems and scripting This lesson will illustrate how to simulate a simple dispersion compensated link elaborating further the concepts of subsystem definition and scripting. Let us set up the following layout, which includes: Figure 81 -Dispersion compensated link span • An abstract source of Gaussian RZ pulses according to a user defined bit sequence • Booster amplifier and filter • SMF and DCF • Inline amplifier and filter • Visualizers Let us examine the signal waveforms at the input, after the SMF and at the end of the span. One can observe that after the SMF the signal pulses are attenuated, broadened by a factor of approx. 2 and that there is considerable inter-symbol interference. 60
Input After SMF Output Figure 82 -Signal evolution in a dispersion compensated link span We can now use the powerful scripting feature of OptiSys in order to avoid the necessity to redefine those of the layout parameters that depend on the signal in case input signals change. One such parameter is the bandwidth of the two inline filters. Open the filter parameter dialog box and switch the “Mode” of the “Bandwidth” to “Script”. Right-click In the value field and select “Bit rate”. Then add ”3 * ” so that the whole field reads “3 * Bit rate”. Click on the layout workspace and show the “Global parameters” dialog. Increase twice the bit rate and calculate again. The following figure shows that regardless of the severe dispersive broadening in the SMF, the signal is again preserved after the whole span, both in terms of power and pulse shape. 61
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Tutorials OptiSys_Design Optical Co
Page 5 and 6:
TABLE OF CONTENTS INTRODUCTION.....
Page 7 and 8:
Introduction The most efficient way
Page 9 and 10:
• Select CW Laser 1.0 and place i
Page 11 and 12:
• The CW laser output to the Mach
Page 13 and 14:
Visualizers and Data Monitors Figur
Page 15 and 16: For each category tab, there is a l
Page 17 and 18: Visualizers parameters In order to
Page 19 and 20: Optical Spectrum Analyzer Optical s
Page 21 and 22: You can also trace the to obtain th
Page 23 and 24: Lesson 2: Subsystems - Hierarchical
Page 25 and 26: Closing the subsystem Main layout S
Page 27 and 28: Subsystem properties: name and icon
Page 29 and 30: • In the Add parameter dialog box
Page 31 and 32: Global parameter frequency Global p
Page 33 and 34: Figure 39 -Adding components to the
Page 35 and 36: Running the simulation You can conn
Page 37 and 38: • Resize the layout by pressing C
Page 39 and 40: Parameter groups table gives you ac
Page 41 and 42: Figure 49 -Simulation results from
Page 43 and 44: Figure 52 -Loop control parameters
Page 45 and 46: • Select Electrical Amplifier 1.0
Page 47 and 48: Figure 57 -BER Analyzer graphs You
Page 49 and 50: The 3D graph is available in the gr
Page 51 and 52: Selecting the parameter to be itera
Page 53 and 54: Changing the values of sweep iterat
Page 55 and 56: Getting results using the Graph bui
Page 57 and 58: Browsing parameter sweep iterations
Page 59 and 60: Lesson 5: Design Versions - EDFA Ch
Page 61 and 62: Lesson 6: Optimizations - System ma
Page 63 and 64: Figure 77 -Getting results 57
Page 65: Figure 79 -Parameters for fiber len
Page 69 and 70: Figure 84 -The dispersion compensat
Page 71 and 72: Lesson 9: Design of a broadband Ram
Page 73 and 74: After creating the subsystem as sho
Page 75 and 76: Figure 91 - Raman Amplifier subsyst
Page 77 and 78: Figure 93 - Forward output spectrum
Page 79 and 80: Lesson 10: Optimization of the gain
Page 81 and 82: It is immediately seen that optimal
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