40GBASE-LR4 CWDM and PSM QSFP+ Transceiver Links

QSFP-40GE-LR4, one of 40GBASE-LR4 coarse wavelength division multiplexing QSFP+ transceivers, is compliant to 40GBASE-LR4 of the IEEE P802.3ba standard. The optical interface is a duplex LC connector. It can support transmission distance up to 10 km over single-mode fiber by minimizing the optical dispersion in the long-haul system. This transceiver converts 4 inputs channels of 10 G electrical data to 4 coarse wavelength division multiplexing optical signals by a driven 4-wavelength distributed feedback (DFB) laser array, and then multiplexes them into a single channel for 40 G optical transmission, propagating out of the transmitter module from the SMF. 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). c9tsDx3f
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