Optical data center network system and optical switch

An optical switch, adapted to a tier-2 of an optical data center network system, the optical switch comprising:

• a plurality of latitudinal ports and a plurality of longitudinal ports, wherein the optical switch is connected to rest of the optical switches in a macro pod in the optical data center network system through the latitudinal ports that are connected to ribbon fibers, and is connected to a pod and a tier-3 optical switch that is connected to the macro pod in the optical data center network system through the longitudinal ports;
• and
• a wavelength selective switch, having M input ports and N output ports, wherein M and N are positive integers, and a sum of M and N is equal to a sum of the latitudinal ports and the longitudinal ports of the tier-2 optical switch, wherein the number of the latitudinal ports is greater than or equal to
• round
• ⁡
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• B
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• P
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• (
• 1
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• ,
• where P value is a predetermined constant value between 0 and 1, and B value is the number of the optical switches in the macro pod, and
• the longitudinal ports comprise a plurality of north longitudinal ports and a plurality of source longitudinal ports, wherein the number of the north longitudinal ports is greater than or equal to round [B·(1−P)]·2.

An optical switch, adapted to a tier-3 of an optical data center network system, the optical switch comprising:

• a plurality of latitudinal ports and a plurality of longitudinal ports, wherein the optical switch is connected to rest of the optical switches through the latitudinal ports that are connected to ribbon fibers, and is connected to a macro pod in the optical data center network system through the longitudinal ports;
• a wavelength selective switch, having Q input ports and R output ports, wherein Q and R are positive integers, and a sum of Q and R is equal to a sum of the latitudinal ports and the longitudinal ports of the optical switch,
• wherein the number of the latitudinal ports of each of the tier-3 optical switches is greater than or equal to
• round
• ⁡
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• B
• 2
• ·
• P
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• (
• 1
• -
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• 2
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• ·
• (
• B
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• 1
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• ·
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• ,
• where P value is a predetermined constant value between 0 and 1, and B value is the number of the optical switches.