【Objective】

2

As video services gradually become the core pillar of broadband networks

Passive Optical Network (PON) technology has rapidly developed

expanding from the traditional field of home broadband access to a wider range of application areas such as government and enterprise

intelligent manufacturing in industry

and telemedicine. Consequently

the requirements for network bandwidth

latency

packet loss rate

and jitter in terms of service quality have become increasingly stringent. In this condition

the next-generation optical access network technology with a speed of 50 Gbit/s has emerged. The 50 Gbit/s PON is not only required to provide an access bandwidth more than four times that of the 10 Gbit/s PON

but also needs to enhance the service support capabilities

network security protection

and ensure compatibility and smooth evolution with the existing 10 Gbit/s PON technology. In the implementation process

the development of optical transmitter components is particularly crucial.

【Methods】

2

The 50 Gbit/s Combo PON Optical Line Terminal (OLT)

presented in this study

leverages hybrid integrated package technology to address key challenges such as multi-channel wavelength combination

signal splitting

and crosstalk minimizing. Through meticulous optical path simulations and crosstalk analyses

the device successfully achieves a balance between performance and efficiency.

【Results】

2

By means of a meticulously designed 4-channel QSFP28 package size module

the functionality of 3 transmitters and 3 receivers within a metal hermetic tube has been realized. At the same time

thanks to advanced optimization design

the crosstalk from the transmitter to the receiver has been significantly reduced

with an improvement of 20 to 30 dB. This important breakthrough not only enhances the performance of the optical components

but also lays a solid foundation for the commercial deployment of 50 Gbit/s PON.

【Conclusion】

2

The test results indicate that the wavelength performance of the optical components proposed in the article fully complies with the requirements of the International Telecommunication Union-Telecommunication Standardization Sector (ITU-T) G.9804.3 international standard. Both the operating eye diagram and sensitivity have reached the expected indicators. This means that the 50 Gbit/s Combo PON OLT optical components are already capable of being applied in actual network environments. Looking to the future

with the continuous progress of technology and the sustained growth of application demands

50 Gbit/s PON will play an important role in promoting broadband network upgrades

enhancing service support

and improving user experience. It is expected that more innovative achievements will continue to emerge in this field

jointly promoting the prosperous development of optical network technology.