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Let us now define a more complex waveform and perform the calculation. After that we can display and compare the input and output signals in terms of their amplitude and pulse shape. Input Output Figure 86 - Input and output waveforms of the dispersion compensated links 64
Lesson 9: Design of a broadband Raman amplifier using subsystems Overview The number of channels deployed in long-haul DWDM systems is rapidly increasing beyond hundreds of channels over the C-band (1528-1563 nm) and L-band (1575-1610 nm). This demand for more bandwidth is driving the search for new and more sophisticated fiber amplifiers that are flattened over a very wide spectral range for maximum bandwidth transmission over the long haul. The specifics of the stimulated Raman scattering effect allow for an interesting technique for gainflattening of broadband Raman amplifiers (Y. Emori, K. Tanaka and S. Namiki, Electron. Lett. 35, 1355, 1999). It requires only a suitable multiple-pump configuration and does not rely on passive filters, gratings, etc. Definition of Multi-line source At an initial stage of the pump system lets set up a group of twelve pump laser diodes having “Parameterized” signal representations and the following wavelengths and powers: LD λ [nm] P [mW] LD λ [nm] P [mW] 1 1405.0 322 7 1450.0 122 2 1412.5 311 8 1457.5 113 3 1420.0 311 9 1465.0 110 4 1427.5 346 10 1480.0 127 5 1435.0 115 11 1495.0 126 6 1442.5 92 12 1510.0 219 After that we multiplex their outputs using, for instance, two multiplexers and a 2x1 power combiner. The channels of the multiplexers should be accordingly adjusted to the wavelengths of the pumps, as shown for the case of the 8x1 multiplexer: Figure 87 -Adjusting multiplexer channels 65
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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 and 66: Figure 79 -Parameters for fiber len
Page 67 and 68: Input After SMF Output Figure 82 -S
Page 69: Figure 84 -The dispersion compensat
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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