Cross-connect switch architecture
A cross-connect switch architecture is described. A cross-connect switch device includes a cross-point switch array, a plurality of photo detectors and a plurality of amplifiers. The cross-point switch array includes a plurality of switches. Each switch is coupled between a respective photo detector and a respective amplifier and is configured to couple the respective photo detector to the respective amplifier when the switch is selected.
1. A cross-connect switch device comprising:
a cross-point switch array;
a plurality of photo detectors; and
a plurality of amplifiers, each cross-point switch array comprising a plurality of switches, each switch coupled between a respective photo detector and a respective amplifier and configured to couple the respective photo detector to the respective amplifier when the switch is selected;
wherein the photo detectors are avalanche photo diodes and the switches are metal oxide semiconductor (MOS) transistors; and
wherein a photo diode inductance at least partially impedance matches a parasitic capacitance of a MOS transistor coupled to the photo diode.
2. The device of claim 1 , wherein each photo diode is coupled to a bias voltage supply via a respective degeneration resistance.
3. The device of claim 1 , wherein the amplifiers are transimpedance amplifiers.
4. The device of claim 1 , wherein each amplifier is at least one of included in and/or coupled to a respective receiver configured to receive an electrical representation of an input optical signal.
5. The device of claim 1 , wherein each switch is coupled between a column conductor and a row conductor, the column conductor coupled to a photo detector and the row conductor coupled to an amplifier.
6. The device of claim 1 , wherein the cross-point switch array, the photo detectors and the amplifiers are included in an integrated circuit.
7. An optical system comprising:
an optical interface configured to receive an optical signal; and
a cross-connect switch device comprising a cross-point switch array, a plurality of photo detectors, and a plurality of amplifiers, each cross-point switch array comprising a plurality of switches, each switch coupled between a respective photo detector and a respective amplifier and configured to couple the respective photo detector to the respective amplifier when the switch is selected;
wherein the photo detectors are avalanche photo diodes and the switches are metal oxide semiconductor (MOS) transistors; and
wherein a photo diode inductance at least partially impedance matches a parasitic capacitance of a MOS transistor coupled to the photo diode.
8. The optical system of claim 7 , wherein each photo diode is coupled to a bias voltage supply via a respective degeneration resistance.
9. The optical system of claim 7 , wherein the amplifiers are transimpedance amplifiers.
10. The optical system of claim 7 , wherein each amplifier is at least one of included in and/or coupled to a respective receiver configured to receive an electrical representation of an input optical signal.
11. The optical system of claim 7 , wherein each switch is coupled between a column conductor and a row conductor, the column conductor coupled to a photo detector and the row conductor coupled to an amplifier.
12. The optical system of claim 7 , wherein the cross-point switch array, the photo detectors and the amplifiers are included in an integrated circuit.
13. The optical system of claim 7 , wherein the optical interface is an imaging optical interface comprising one optical element.
14. The optical system of claim 7 , wherein the optical interface comprises a plurality of optical elements.