25 March 2010


Mitsubishi Electric introduces world's first Dual-Rate Burst-Mode Optical Transceiver for 10G-EPON systems

Tokyo-based Mitsubishi Electric Corporation says it has developed the world's first dual-rate burst-mode optical transceiver that enables the coexistence of GE-PON and 10G-EPON, which is used in Optical Line Terminals (OLT). In part, the work was supported by the National Institute of Information and Communications Technology.

According to the firm, the transceiver will be integral to cost-effectively installing 10G-EPON systems on existing fiber plant networks. This will enable the optical access system to provide a faster, more economic connection by using existing optical fiber networks effectively.

In current FTTH optical access systems, the 1Gbps GE-PON is extensively utilized. But with the recent growth of internet traffic, an optical access system of 10G-EPON that can transmit data 10 times faster is expected to provide users with a more comfortable online environment, such as easier high-definition video delivery and bulk file transfers.

When the 10G-EPON system is introduced, to reduce costs of laying fibers and equipment, both the GE-PON and 10G-EPON systems are required to be installed in the same fiber. To downstream from an OLT to an Optical Network Unit (ONU), a mixed installation using multiple wavelength systems that multiplex 1Gbps signals and 10Gbps signals in different wavelengths is required. To upstream from ONU to OLT, a mixed installation using time-division multiplexing systems that multiplex them in the same wavelength is required. The biggest challenge is the development of a 10G/1G Dual-rate Burst 3R Transceiver for 10G-EPON corresponding to those systems.


1) Dual-rate burst-mode 3R transceiver enabling co-existing of 10G-EPON and GE-PONs.

Mitsubishi Electric has developed key devices for dual-rate burst-mode optical transceiver to enable the coexistence of GE-PON with 10G-EPON. The key devices achieve the world's highest receiver sensitivity, says the firm.

  • Chip set for dual-rate burst-mode receiving circuit
    Burst-mode preamplifier IC and limiting amplifier IC are developed, which can switch their gain and bandwidth optimized for 10Gbps and 1Gbps receiver less than 800ns.
  • 82.5GS/s sampling CDR (Clock and Data Recovery) for dual-rate operation
    Burst-mode CDR consists of 82.5GS/s sampling IC, the world's fastest sampling speed, and a dual-rate data selector logical circuit.

2) Optical performances complying with the strictest standards IEEE802.3av PR30 standards

Mitsubishi Electric developed optical devices (EML, DFB, APD-preamplifier) and a triplexer optical module, which fully meet the IEEE802.3av PR30 standards. They are integrated into a XFP-E-sized 2R transceiver. Their excellent transmission performance enables a loss budget of 29dB, the split ratio of 32 and a maximum transmission distance of SMF 20km, effectively utilizing existing fiber plant networks for coexistent GE-PON and 10G-EPON systems.

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