Multi-rate optical transceiver

A network communication system employing a multi-rate optical transceiver, comprising:

• a host device comprising multiple interfaces;
• at least one multi-rate optical transceiver installed in one of said interfaces of said host device, said at least one multi-rate optical transceiver comprising:
• a rate selector configured to switch between different transmission rates;
• multiple signal transceiver units coupled to said rate selector, said signal transceiver units comprising a first signal transceiver unit operating at a first transmission rate and a second signal transceiver unit operating at a second transmission rate, wherein the first transmission rate is distinct from the second transmission rate, said first signal transceiver unit comprising a first electro-optical converter for converting electrical signals to optical signals and a first optoelectronic converter for converting optical signals to electrical signals, said second signal transceiver unit comprising a second electro-optical converter for converting electrical signals to optical signals and a second optoelectronic converter for converting optical signals to electrical signals;
• and
• a wavelength division multiplexing demultiplexer coupled to said signal transceiver units and configured to modulate wavelengths of at least one of the optical signals from said signal transceiver units into different frequency bands which combined into grouped optical signals for external transmission;
• and
• a user terminal device connected via an optical fiber cable and coupled to said at least one multi-rate optical transceiver, said user terminal device comprising an optical demultiplexer and a user-side optical transceiver.