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Example 3.10: distributed Raman amplification - #14
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A new Raman-Amplified Span block (undepleted co- or counter-pump on silica's measured gain shape, with spontaneous Raman noise) and the 3.10 project: the same 100 km span with an EDFA alone and with a 500 mW counter pump, 5.59 dB of OSNR apart. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01QyFKVaCgeNnffYed8jcYjJ
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Requested by Ehsan · project thread
Before: roadmap row 3.10 was still 🟡. The library had inter-channel stimulated Raman scattering (SRS) inside
Fiber, but no pump and no Raman noise, so distributed Raman gain could not be shown.After: a new Raman-Amplified Span block, and an example "3.10 Distributed Raman amplification" in the Examples menu. The example runs the same 100 km span two ways:
The pumped span has 13.42 dB of on-off gain and an equivalent noise figure of −1.08 dB.
How: the pump is undepleted and decays along the span. The gain uses the same measured silica profile as
kernels.raman_gain. Spontaneous Raman noise, including its thermal share, is integrated along the span and emitted as noise bins over the C-band. The block has no dispersion, no Kerr effect, no pump depletion and no double Rayleigh backscatter; the lesson says so and the roadmap lists them as open. The lesson's numbers, including its "Try this" claims, are tested intests/test_amplified.py.🤖 Generated with Claude Code
https://claude.ai/code/session_01QyFKVaCgeNnffYed8jcYjJ
Generated by Claude Code