40GBASE-LR4 CWDM and PSM QSFP+ Transceiver Links

40GBASE-LR4 coarse wavelength division multiplexing QSFP+ Transceiver

QSFP-40GE-LR4, one in every of 40GBASE-LR4 coarse wavelength division multiplexing QSFP+ transceivers, is compliant to 40GBASE-LR4 of the IEEE P802.3ba normal. The optical interface may be a duplex LC connecter. It will support transmission distance up to ten kilometre over single-mode fiber by minimizing the optical dispersion within the long-haul system.

This transceiver converts four inputs channels of ten G electrical knowledge to four coarse wavelength division multiplexing optical signals by a driven 4-wavelength distributed feedback (DFB) optical maser array, then multiplexes them into one channel for forty G optical transmission, propagating out of the transmitter module from the SMF. Reversely, the receiver module accepts the forty G coarse wavelength division multiplexing optical signals input, and demultiplexes it into four individual 10G channels with totally different wavelengths. The central wavelengths of the four coarse wavelength division multiplexing channels area unit 1271, 1291, 1311 and 1331 nm as members of the coarse wavelength division multiplexing wavelength grid outlined in ITU-T G694.2. every wavelength channel is collected by a distinct pic diode and output as electrical knowledge once being amplified by a transimpedance electronic equipment (TIA).

40GBASE-LR4 PSM QSFP+ Transceiver

Different from coarse wavelength division multiplexing QSFP+ transceiver that uses a LC connecter, parallel single-mode QSFP+ may be a parallel single-mode optical transceiver with AN MTP/MPO fiber ribbon connecter. It offers four freelance transmit and receive channels, every capable of ten G operation for AN mixture rate of forty G over single-mode fiber concerning ten kilometre. The cable cannot be twisted to stay correct channel to channel alignment.

In a parallel single-mode QSFP+, the transmitter module accepts electrical input signals and also the receiver module converts parallel optical input signals via a photograph detector array into parallel electrical output signals. The receiver module. All knowledge signals area unit differential and support a knowledge rates up to ten.3 G per channel.

Difference of 2 Links

What's the distinction of those 2 links? From the point of view of optical transceiver module structure, parallel single-mode looks a lot of price effective as a result of it uses one uncooled CW optical maser that splits its output power into four integrated element modulators. Besides, its array-fiber coupling to AN MTP connecter is comparatively easy. From the point of view of infrastructure, parallel single mode is dearer, as a result of once the link distance is long, parallel singlemode uses eight optical singlemode fibers whereas coarse wavelength division multiplexing uses solely a pair of optical singlemode fibers. For a lot of concerning their variations, please see the subsequent table:

What's a lot of, within the knowledge center fiber infrastructure, the patch panel must be modified to accommodate MTP cables. this may price over LC connectors and regular single mode fiber cables. Besides, it isn't simple to wash MTP connectors. thus coarse wavelength division multiplexing is a lot of profitable and standard for 40GBASE-LR4 QSFP+ link.

For 40GBASE-LR4 QSFP+ transceivers, each coarse wavelength division multiplexing link and parallel single mode link will reach the transmission distance of ten kilometre. 40GBASE-LR4 CWDM QSFP+ transceivers use a duplex LC connecter via a pair of optical sm fibers. And 40GBASE-LR4 parallel single mode QSFP+ transceivers use AN MTP/MPO fiber ribbon connecter via eight optical sm fibers. Thus, there's no have to be compelled to build any changes to upgrade ten G fiber cable plant to forty G property, that is less expensive. Fiberstore provides wide whole compatible forty G coarse wavelength division multiplexing QSFP+ transceivers, like Juniper compatible JNP-QSFP-40G-LR4 and power unit compatible JG661A. every fiber optic transceiver has been tested to make sure its compatibility and ability.