What are Transponders?

In optical networking, transponders transmit any standard data, storage and video client services by mapping each of them into separate spectral wavelength. They are an important component in OTN (optical transport network) and DWDM (dense wavelength division multiplexing) fiber optical networks.

Transporting services up to 40G over separate wavelengths

Figure 1: Transporting services up to 40G over separate wavelengths

Transponders extend network distance by converting short reach optical interfaces of LAN Ethernet, SAN Fibre Channel, and SONET/SDH into wavelengths. They preform the 3R’s (retiming reshaping, re-amplifying) to transmit a reliable error-free optical communication link between remote data centers and central office sites.

In long haul and metro links which include optical amplifiers, transponders map the signals into a standard OTN layer which supports forward error correction (FEC) and guarantees error-free transmission without the need for regenerators.

Transporting a Mix of 100Gb Ethernet and OTU4 Services

Figure 2: Transporting a Mix of 100Gb Ethernet and OTU4 Services

PacketLight 1U transponders are highly integrated and includes the optical amplifiers, mux/Demux and an optical switch for fiber protection.

Transponders transport data at its full rate with full transparently, and without changing or manipulating it. Depending on the application, transponders can work as an optical-electrical-optical (OEO) wavelength converter, OTN transponder, or fiber-to-fiber media converter.

Transponders carry out performance monitoring on all the optical interfaces on both the client and the uplink sides and on the client service, enabling quick fault isolation and diagnostics of the fiber link, which assists the service providers and enterprise in meeting their SLAs.

Depending on the application and product type, transponders transport services from 1G up to 400G and can provide additional functionality such as protection of the optical link and encryption.

PacketLight's highly integrated compact 1U transponder devices comprise mux/demux, DCM and amplifiers (when required for long distances). The slots on the device fit standards-based modules (SFP, SFP+, XFP and/or CFP), providing users a modular, pluggable solution for both service and line sides.

This architecture enables easy growth by simply adding optics or services as needed.

PacketLight Transponders

Figure 3: View of PacketLight Transponders

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