OPTICAL CIRCULATOR SOLUTION TO CONVERT UNIDIRECTIONAL OPTICAL LINKS INTO BIDIRECTIONAL LINKS
The DM936 C13 DUPLEXER is the perfect solution for converting dual-fiber links into single-fiber links without the need to replace optical transceivers.
Operating in the 1260 nm to 1340 nm band, this passive optical circulator offers low insertion loss and optimizes fiber utilization, freeing up one fiber for every two, with minimal investment. It has an LGX format, allowing it to be mounted in 19” racks using the MA-26 accessory.
Bidirectional transceivers use different wavelengths for uplink and downlink signals, resulting in two distinct transceiver codes at each end. When looking to optimize existing installations that use dual-fiber links to single-fiber, the DM936 C13 is essential as it adjusts the coupling of signals from two fibers to one.
Additionally, Datacom also offers conventional bidirectional transceivers to complement this solution.
Applications
The operation of the DM936 C13 is simple and efficient: the transmission signal (TX) from the transceiver enters port 1 and is directed to port 2, which corresponds to the link. The signal received on the link at port 2 is then redirected to port 3, where it is received by the transceiver. For this configuration to work correctly, a circulator must be installed at each end of the link.
The figure above demonstrates the difference between the original configuration, using two fibers, and the optimization provided by the DM936 C13, where only one fiber is used to transmit and receive the signals. This feature is especially useful for freeing up one of the fibers in systems where both are initially needed, allowing for more efficient and cost-effective use of existing infrastructure. Migrating to use the DM936 C13 requires re-evaluation of the available power budget. Introducing the two DM936 C13 units into the link causes a total maximum loss of up to 2.2dB point-to-point, recommended for links up to 35 km in distance.
In addition, the DM936 C13 preserves the original transceivers, maintaining system integrity and reducing costs associated with equipment replacement. This optical circulator is an effective solution for extending the capacity of optical networks while maximizing the return on investment in fiber optic infrastructure.
