Q

What are the specified launched power and receive sensitivity of GPON and PtP networks?

Fiber expert David Hashman details launched power and receive sensitivity specifications for gigabit packet optical networks and active Ethernet point-to-point networks.

In the case of fiber to the home (FTTH), gigabit packet optical networks (GPON) or point-to-point (PtP), what is the power of the emitted beam (source power)? Also, what is the sensitivity of the receiving device -- e.g., optical network terminal (ONT) or switch?

The ITU-T Recommendation G.984.2 Amendment 1 (February 2006) specifies the generic optical power levels for a 2.4 Gbps downstream/1.2 Gbps upstream GPON system. For the optical line terminal (OLT), the mean launched power must be between +1.5 dBm and +5dBm and the receive sensitivity must be between -28 dBm and -8 dBm. For the ONT, the mean launched power must be between +0.5 dBm and +5 dBm and the receive sensitivity must be between...

-27 dBm and -8 dBm. Actual vendor implementations may vary, so check their specifications.

For active Ethernet point-to-point (PtP) networks, transmit power and receive sensitivity are functions of the optics used by the particular switching equipment. Cisco's 1000BASE-BX10-D/U Small Form-Factor Pluggable (SFP) Gigabit Interface Converters, for example, have a mean launched power between -9 dBm and -3 dBm and a receive sensitivity between -19.5 dBm and -3 dBm.

This was first published in August 2010

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