Multi-Bit Rate Passive Optical Network OLT and ONU
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Solution Overview
Problem
Prior art passive optical networks are limited by their inability to support multiple bit rates between an optical line termination unit (OLT) and optical network units (ONUs), requiring duplicate infrastructure for each bit rate and reducing flexibility in adapting to changing customer needs or conditions.
Innovation Solution
A passive optical network system where the OLT can perform downstream transmission at multiple bit rates, and each ONU can receive and process upstream transmissions at various bit rates, maintaining phase and frequency lock across different bit rates, allowing for flexible operation and efficient use of infrastructure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed bit rate is used between OLT and ONUs, then the system is simple to implement, but the network flexibility and adaptability to changing needs deteriorates
Solution Approach 1:
The patent implements dynamic bit rate adjustment capability in the OLT, allowing it to switch between different downstream bit rates (e.g., 1.25 Gbps, 2.5 Gbps) based on network conditions and service requirements. The CDR circuit dynamically locks to the transmitted bit rate, enabling flexible adaptation without changing physical infrastructure.
Solution Approach 2:
The system changes the bit rate parameter of the optical signal transmitted by the OLT to match different service requirements. The CDR circuit automatically adjusts to the new bit rate parameter, allowing the same physical network to support multiple bit rate services.
2Adaptability or versatility
If multiple ONUs with different bit rates are supported, then network versatility improves, but infrastructure complexity increases
Solution Approach 1:
The OLT is designed with multi-functionality to support multiple downstream bit rates (1.25 Gbps, 2.5 Gbps, and potentially higher). A single OLT unit can serve both 1G/1.25G and 2.5G/3G PON services simultaneously, eliminating the need for separate OLTs for each bit rate service.
Solution Approach 2:
The patent merges multiple bit rate capabilities into a single OLT platform. The unified CDR circuit and optical transmission path can handle different bit rates, combining what would traditionally require separate infrastructure into one integrated system.
3Reliability
If duplicate OLTs and ONUs are deployed for each bit rate, then bit rate reliability is maintained, but cost and resource utilization deteriorates
Solution Approach 1:
The OLT and ONU are designed as universal devices that can operate at multiple bit rates. The CDR circuit in both OLT and ONU can lock to different bit rates, allowing a single pair of devices to provide reliable service at multiple bit rates rather than requiring dedicated hardware for each rate.
Data Source
AI summary
Systems and techniques for multiple bit rate optical data transmission. A passive optical network includes an optical line termination unit (OLT) connected to one or more optical network units (ONUs) by optical elements. The OLT is capable of performing downstream transmission to the ONUs at each of a variety of different bit rates, and each ONU performs upstream transmission at one or more bit rates. The OLT can sense a bit rate of a received transmission and change its operation so as to receive and process the transmission exhibiting the sensed bit rate. Each of the ONUs receives and processes downstream transmissions at one or more bit rates, but each ONU is capable of maintaining a phase and frequency lock to downstream transmissions at all bit rates supported by the OLT. One or more of the ONUs may also receive and process downstream transmissions exhibiting different or changed bit rates.