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Auto-Tuning for 25G Tunable DWDM Transceivers

1、Overview

With the emergence of new services, the increased bandwidth consumption is forcing network operators to make continuous changes to their front-haul infrastructure to increase network capacity. HiSilicon Optoelectonics developed auto-tuning technology to SFP28 tunable DWDM optics to boost the capacity of front-haul networks without significant changes to existing hardware equipment and fiber resources. What’s more, with automated tuning capabilities it also reduces inventory and provisioning efforts to a minimum.

2、Auto-Tuning Principle

HiSilicon Optoelectronics’ auto-tuning solution is shown in the following system schematic, a low frequency auto-tuning signal is overlaid on top of the normal signal as a kind of out-band pilot tone modulation information channel, the transmitter/receiver’s wavelength related information are carried in the information channel to let both HEE (head-end-equipment) and TEE (tail-end-equipment) automatically match each other. HEE and TEE play the same role in auto-tuning procedure, which is different from G.698.4 (known as G.metro), where auto-negotiation mechanism is based on master/slave mode.
The wavelength negotiation is started from channel 1 up to the matched channel, and adjustment time is less than 8 seconds between two neighbor channels. Furthermore, the sensitivity loss (0.5-1 dB) caused by pilot tone modulation is within the link margin scope, which does not compromise fiber transmission performance. This solution does not involve complex circuits and significantly improves network O&M efficiency at lower costs.

Figure 1: Auto-Tuning Principle

 Figure 1: Auto-Tuning Principle

3、Summary

HiSilicon Optoelectronics’ auto-tuning technology for tunable DWDM SFP28 optical help customers simplify on-site setup of wireless front-haul network, simply plug into a host device and passive mux, the transceiver does the rest, reduce operational expenditur


Download Link:Technical Guide - 25G Tunable


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