A low-cost driving method of SOA bias current for PON link

By combining a single-channel constant current source drive system with a current distribution network and a central coordinating controller, the independence and cost issues of laser and SOA bias current drive in PON systems are solved, achieving synchronous and stable biasing of the laser and SOA, thus improving the transmission quality and cost-effectiveness of the PON system.

CN121984451BActive Publication Date: 2026-07-07CHENGDU SUNWAY YUANGUANG COMM TECH CO LTD
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Patent Information

Application Number
CN202610454490.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2026-04-08
Publication Date
2026-07-07
Estimated Expiration
2046-04-08

AI Technical Summary

Technical Problem

In existing PON systems, the bias current driving method for lasers and SOA cannot achieve independent and dynamic coordination under low cost constraints, making it difficult to balance functional implementation and system cost. Furthermore, load coupling in PON uplink burst mode leads to problems such as power supply voltage fluctuations and gain crosstalk.

Method used

By employing a single constant current source combined with a current distribution network, a central coordinating controller, and a local energy storage capacitor, and through real-time signal acquisition and dynamic control, independent and controllable bias current drive of the laser and SOA is achieved. Adjustable current mirrors and energy storage capacitors are used to compensate for transient current requirements, and machine learning and digital predistortion techniques are combined to optimize current distribution and signal processing.

Benefits of technology

It enables simultaneous, independent, and stable biasing of the laser and SOA during PON uplink bursts, reducing system cost and complexity, improving burst setup speed and long-term stability, enhancing signal transmission quality, and supporting low-cost integration of high link budget PON systems.

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Abstract

The application discloses a low-cost PON link SOA bias current driving method and belongs to the technical field of optical communication. By introducing a current distribution network composed of an adjustable current mirror, a local energy storage capacitor pre-charging mechanism and a central cooperative controller, simultaneous, independent and stable biasing of a laser and a semiconductor optical amplifier during PON uplink burst transmission is realized. The central cooperative controller configures the current mirror ratio in advance and pre-charges the energy storage capacitor according to the uplink burst enable signal before the burst starts, maintains simultaneous power supply during the burst, and cuts off the power supply after the burst to reduce power consumption. Compared with the prior art, the application completely avoids the use of an external independent current source chip, significantly reduces the bill of materials cost and system complexity, while ensuring the burst response speed, biasing accuracy and nonlinear distortion suppression effect, and can be widely applied to a passive optical network system with high link budget.
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