A casino game, based on the rules of poker, wherein each player is dealt five cards, with an option to utilize a sixth card to improve the five-card hand. The method includes reducing a transmission power of the first data channel by a first amount; and reducing a transmission power of the second data channel by a second amount, wherein the first amount and the second amount have different values. An optical beam is to be directed through the first optical path. The technical solutions can reduce volume, power consumption, and costs of the nodes, and avoid a problem of generation of data conflict on an optical layer due to lack of optical buffers in all optical switching. Therefore, the wavelength conversion efficiency improves and the peak power of optical amplifiers 1611 and 1612 can be suppressed, which allows the wavelength of lights that are output from optical amplifiers 1611 and 1612 to be further narrowed.