1×2 MMI
Photonic chips are an experimental feature. Switch them on under Help › Experimental features.
A 1 × 2 multimode interference (MMI) splitter divides its input equally between two outputs, in phase. It stands for a Y-branch too. Run backwards, it combines two waveguides into one.
Ports
in on one side; out 1 and out 2 on the other.
The model
\[S_{\text{in},1} = S_{\text{in},2} = S_{1,\text{in}} = S_{2,\text{in}} = \frac{a}{\sqrt2},\]with \(a\) the excess loss in amplitude, and nothing between the two outputs. Backwards it adds its two inputs as fields, \(E_\text{in} = a(E_1 + E_2)/\sqrt2\): light in phase on both comes through, and what is out of phase is sent off the chip, as in a real MMI or Y-branch.
Settings
| Field | Default | Meaning |
|---|---|---|
loss | 0.2 | Excess loss (dB) |
From the tool's own tables, file format version 1: the names are those in a .jekray file.
Readouts
Its ports and what they join, and the powers where the fibre network reaches them.
Assumptions
- Flat in wavelength, with no reflection: a real MMI’s imbalance and its band are not modelled.
Related
- 2×2 MMI.
- Splitter and combiner, the fibre one.