Optical cross-connect

A reconfigurable optical add-drop multiplexer, comprising a wavelength selective switch (WSS) and at least one optical cross-connect, wherein the optical cross-connect, comprising an input-end unit, an optical beam-splitting and switching unit, and an output-end unit, wherein

• the input-end unit comprises M input ports, the input-end unit is configured to transmit M first light beams in a set of first light beams to the optical beam-splitting and switching unit;
• and light propagation paths of the M first light beams do not overlap;
• the optical beam-splitting and switching unit is configured to split each first light beam in the set of first light beams into Qi second light beams, to obtain a set of second light beams, wherein the set of second light beams comprises Z second light beams, the Z second light beams comprise M groups of second light beams, and each group of second light beams corresponds to one first light beam and comprises Qi second light beams;
• and i∈[1, M], Z=Q1+Q2+ . . . +QM, Qi>=1, and at least one value of Qi is greater than or equal to 2;
• the optical beam-splitting and switching unit is further configured to:
• perform optical path deflection on each group of second light beams based on a preset optical-path offset parameter set, and transmit, to the output-end unit, the deflected second light beams, wherein an Nth group of offset parameters in the optical-path offset parameter set is used to perform optical path deflection on the Nth group of second light beams, so that all second light beams in the Nth group of second light beams are deflected and then output to QN output ports of the output-end unit in a one-to-one correspondence manner, wherein N∈[1, M];
• and
• the output-end unit comprises Z output ports, and the output-end unit is configured to output the second light beams.

An optical cross-connect, comprising:

• an input-end unit, a polarization splitting apparatus, a first polarization conversion apparatus, a polarization-dependent optical beam-splitting and switching unit, a second polarization conversion apparatus, a polarization combining apparatus, and an output-end unit, wherein
• the input-end unit comprises M input ports, the input-end unit is configured to transmit M first light beams in a set of first light beams to the polarization splitting apparatus;
• and light propagation paths of the M first light beams;
• the polarization splitting apparatus is configured to:
• perform polarization splitting on each first light beam in the set of first light beams to obtain a set of third light beams and a set of fourth light beams, wherein an Xth third light beam in the set of third light beams is a light beam component that is in a first polarization state and that is of an Xth first light beam in the set of first light beams, and an Xth fourth light beam in the set of fourth light beams is a light beam component that is in a second polarization state and that is of the Xth first light beam in the set of first light beams;
• transmit each third light beam in the set of third light beams to the polarization-dependent optical beam-splitting and switching unit;
• and transmit each fourth light beam in the set of fourth light beams to the first polarization conversion apparatus;
• wherein X∈[1, M];
• the first polarization conversion apparatus is configured to:
• perform polarization state conversion on each fourth light beam in the set of fourth light beams to obtain a set of fifth light beams, wherein each fifth light beam in the set of fifth light beams is in the first polarization state;
• and output each fifth light beam in the set of fifth light beams to the polarization-dependent optical beam-splitting and switching unit;
• the polarization-dependent optical beam-splitting and switching unit is configured to split each third light beam in the set of third light beams into Qi sixth light beams, to obtain a set of sixth light beams, wherein the set of sixth light beams comprises Z sixth light beams, the Z sixth light beams comprise M groups of sixth light beams, and each group of sixth light beams corresponds to one third light beam and comprises Qi sixth light beams;
• and i∈[1, M], Z=Q1+Q2+ . . . QM, Qi>=1, and at least one value of Qi is greater than or equal to 2;
• the polarization-dependent optical beam-splitting and switching unit is further configured to:
• perform optical path deflection on each group of sixth light beams in the set of sixth light beams based on a preset first optical-path offset parameter set, and transmit, to the polarization combining apparatus, the Z sixth light beams that are in the set of sixth light beams and that are deflected, wherein an Nth group of offset parameters in the first optical-path offset parameter set is used to perform optical path deflection on an Nth group of sixth light beams in the set of sixth light beams, so that each sixth light beam in the Nth group of sixth light beams is deflected and transmitted to the polarization combining apparatus, wherein N∈[1, M];
• the polarization-dependent optical beam-splitting and switching unit is further configured to split each fifth light beam in the set of fifth light beams into Qi seventh light beams, to obtain a set of seventh light beams, wherein the set of seventh light beams comprises Z seventh light beams, the Z seventh light beams comprise M groups of seventh light beams, and each group of seventh light beams corresponds to one fifth light beam and comprises Qi seventh light beams;
• the polarization-dependent optical beam-splitting and switching unit is further configured to:
• perform optical path deflection on each group of seventh light beams in the set of seventh light beams based on a preset second optical-path offset parameter set, and transmit, to the second polarization conversion apparatus, the Z seventh light beams that are in the set of seventh light beams and that are deflected, wherein an Nth group of offset parameters in the second optical-path offset parameter set is used to perform optical path deflection on an Nth group of seventh light beams in the set of seventh light beams, so that the seventh light beams in the Nth group of seventh light beams are transmitted to the second polarization conversion apparatus in a one-to-one correspondence manner after being deflected, wherein N∈[1, M];
• the second polarization conversion apparatus is configured to:
• perform polarization state conversion on the M groups of seventh light beams in the set of seventh light beams to obtain a set of eighth light beams, wherein each eighth light beam in the set of eighth light beams is in the second polarization state;
• and output each group of eighth light beams in the set of eighth light beams to the polarization combining apparatus;
• the polarization combining apparatus is configured to:
• perform polarization combining on the Z sixth light beams in the set of sixth light beams and Z eighth light beams in the set of eighth light beams to obtain the set of second light beams, and transmit each second light beam in the set of second light beams to the output-end unit, wherein the set of second light beams comprises Z second light beams;
• and
• the output-end unit comprises Z output ports, and the output-end unit is configured to output the second light beams in the set of second light beams.