Application Notes
| Jitter Injection using the Multi- Channel BPG |
| This note presents the setup to allow injection of jitter using a SHF Bit Pattern Generator. It demonstrates that SHF BPG’s are jitter transparent, i.e. it correctly transfer jitter from the clock to the data output signal. This enables jitter tolerance tests as required by many telecommunication standards such as 100G Ethernet and 40 GBit/s OTN.
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| Multi-Level Signal Generation using the Multi-Channel SHF 12103A |
| The objective of this note is to provide a simple guide on how to make the best use of the SHF 12103 A Quad-32, 4-channel 32 Gbps BPG, as a multi-bit data source, to realise 4-level electrical signals when used in conjunction with an external broadband power combiner.
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| Skew Control |
| This application note describes how the alignment of the output signals from the Pattern Generator SHF 12103A could be adjusted greatly over many bit periods (integer bit delay) and fine-tuned within tenth of a picoseconds (skew control).
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| DQPSK - Bit Error Test Solution |
| Provides a general overview of the optical DQPSK, the generic structure of the SHF DQPSK optical TX and RX modules and the application in conjunction with SHF's 50 Gbps BERT System
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| Jitter Analysis using SHF 10000 Series BERT Equipment |
| A short description of jitter and a tour of the SHF software used for the measurements. Includes an outline of the theory involved.
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| Operation of the SHF 46100 A E/O Converter |
| Describes the principle of operation and offers some hints on how to get the best out of the module.
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| Operation of the SHF 404 Multiplexer Module |
| The basic setup and operation of the 60 Gbps mux module.
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| Operation of the SHF 423 Demultiplexer Module |
| How to use the SHF 423 to demultiplex 60 Gbps signals.
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| Impact of Bias Tees on Communication Signals |
| Contains data and advice on some issues which should be considered when selecting a bias tee.
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| Using SHF BERT Systems in Fiber Loop Experiments |
| Describes the use of a Brimrose Controller in recirculating fiber loop experiments in conjunction with SHF equipment and special extras.
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| Eye Length Adjustment Application Note |
| Describes the feature on SHF multiplexers and pattern generators for adjusting the eye length.
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| Upgrading 12 Gbps BERT systems to 50 Gbps |
| There are several ways of upgrading to 50 Gbps depending on cost and functionality. This application note gives an overview of the different methods.
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| Effect of Bandwidth of Measurement System on RZ Signals |
| Electrical RZ signals demand measurement instruments with very high bandwidth for correct measurement. This application note shows some typical measurement setups and the results that can be expected from them.
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| Cause of Unequal Error Rates in EA Subchannels |
| Gives details about how the SHF EA 44 detects errors, and explains why this can lead to channel-dependent errors if the instrument is not set up correctly. The solution is straightforward once the mode of operation is understood.
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