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BroadLight rolls out GPON PHY

Posted: 16 Nov 2006 ?? ?Print Version ?Bookmark and Share

Keywords:BroadLight? GPON? BL2901? CMOS? Rogue ONT?

BroadLight Inc. has upgraded the PHY IC in its Gigabit passive optical network (GPON) solution, in the last step prior to creating a single-chip optical line-termination system. The BL2901 chip includes a burst-mode laser driver, limiting amp and a suite of ADCs and DACs for glueless interfaces to optical transceivers.

The CMOS device is flexible enough to allow designs that use both distributed-feedback (DFB) and Fabry-Perot lasers, although Shimon Hochbaum, director of corporate strategy at BroadLight, said that most GPONs are turning to DFB lasers, particularly for longer-reach networks.

The chip is BroadLight's first to integrate a patented function called Rogue, which stands for Rogue optical network terminal (ONT) guard and elimination. This provides laser safety and protects the system from logic and PCB faults.

The chip allows a PC-based calibration and upstream test of the ONT, in which the PC activates the laser in continuous mode, and measures and calculates laser calibration values. The chip allows the startup of an ONT unit in less than 45s and a turn-on in less than 4bits at 1.2Gbps. The BL2901 comes in a 48-lead BCC and dissipates 0.5W.

The BL2901 chip includes a burst-mode laser driver, limiting amp, and ADCs and DACs for glueless interfaces.

- Loring Wirbel
EE Times




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