Reversely, the receiver module accepts the 40 G coarse wavelength division multiplexing optical signals input, and demultiplexes it into 4 individual 10G channels with different wavelengths. The central wavelengths of the 4 coarse wavelength division multiplexing channels are 1271, 1291, 1311 and 1331 nm as members of the coarse wavelength division multiplexing wavelength grid defined in ITU-T G694.2. Each wavelength channel is collected by a discrete photo diode and output as electric data after being amplified by a transimpedance amplifier (TIA).
Different from coarse wavelength division multiplexing QSFP+ transceiver which uses a LC connector, parallel single-mode QSFP+ is a parallel single-mode optical transceiver with an MTP/MPO fiber ribbon connector.