1 | In many implementations of numerical matrix solvers the input vector is also called the right-hand side vector. | |

2 | Note that in other publications the tuning or equivalent microscopic displacements are sometimes defined via an optical path-length difference. In that case, a tuning of is used to refer to the change of the optical path length of one wavelength, which, for example, if the reflection at a mirror is described, corresponds to a change of the mirror’s position of . | |

3 | The signal sidebands are sometimes also called audio sidebands because of their frequency range. | |

4 | The term effective refers to that amount of incident light, which is converted into photo-electrons that are then usefully extracted from the junction (i.e., do not recombine within the device). This fraction is usually referred to as quantum efficiency of the photodiode. | |

5 | Please note that in the presence of losses the coupling is defined with respect to the transmission and losses. In particular, the impedance-matched case is defined as , so that the input power transmission exactly matches the light power lost in one round-trip. | |

6 | Also known as the far-field angle or the divergence of the beam. | |

7 | Please note that this formula from [50] is very compact. Since the parameter is a complex number, the expression contains at least two complex square roots. The complex square root requires a different algebra than the standard square root for real numbers. Especially the third and fourth factors can not be simplified in any obvious way: ! | |

8 | [50] states that the indices must obey the following relations: . However, that is not the case. |

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