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Figure 92 - Broadband gain-flattened Raman amplifier layout For the properties of the amplifier fiber we enter the typical values of a SMF-28 fiber and set its length to 40 km. Everything is now set and we start the calculation of the current design version only. When it is finished we can display and analyse the signal spectra at different points of the system for example the output powers: 70
Figure 93 - Forward output spectrum of the amplified signals and the backscattered pump It is seen that the gain of the device is relatively flat in a broad spectral region. The next lesson will show how to improve that feature further by using the optimization tools of OptiSys_Design. Using the interactive 3D graphics The Raman amplifier component provides rich visual information in the form of 3D surfaces that are interactive in real time. These 3D plots show the evolution along the fiber length of the following important characteristics of the device: • Signal power spectrum • Gain spectrum • Gain coefficient spectrum • Noise figure spectrum • Double Rayleigh scattering spectrum Two 3D graphs of each type are supported – for the forward and backward propagating signals respectively. The following picture shows the evolution of the gain experienced by the forward propagating waves. The high gain of the ASE in the shorter wavelength region (right) is due to the fact that it experiences both Rayleigh and stimulated Raman scattering in the field of the strong pumps. 71
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Tutorials OptiSys_Design Optical Co
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TABLE OF CONTENTS INTRODUCTION.....
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Introduction The most efficient way
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• Select CW Laser 1.0 and place i
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• The CW laser output to the Mach
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Visualizers and Data Monitors Figur
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For each category tab, there is a l
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Visualizers parameters In order to
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Optical Spectrum Analyzer Optical s
Page 21 and 22:
You can also trace the to obtain th
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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 and 66: Figure 79 -Parameters for fiber len
Page 67 and 68: Input After SMF Output Figure 82 -S
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: Figure 91 - Raman Amplifier subsyst
Page 79 and 80: Lesson 10: Optimization of the gain
Page 81 and 82: It is immediately seen that optimal
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