Optical Burst Transmission Timing Control for TDMA
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Solution Overview
Problem
Conventional network configurations without optical network unit large scale integration (ONU-LSI) cannot perform optical TDMA communication, leading to signal collisions and failure in receiving optical signals from subscriber-side network devices.
Innovation Solution
A transmitting device with an arithmetic processing unit that includes a data signal transmission instruction unit, an optical signal control instruction unit, and an instruction output adjustment unit, which controls the timing of data and optical signal transmissions to enable optical TDMA communication without ONU-LSI, using an Ethernet controller and optical signal transmitter/receiver to manage optical burst signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional network configurations without ONU-LSI are used, then device complexity is reduced, but optical TDMA communication cannot be performed leading to signal collisions
Solution Approach 1:
The patent introduces an intermediary component (optical signal control instruction unit) that mediates between the data signal transmission and optical signal output. This intermediary coordinates the timing and synchronization between data packets and optical bursts, enabling TDMA communication without requiring full ONU-LSI functionality. The intermediary translates control instructions into coordinated actions between different transmission components.
2Speed
If optical burst transmission is implemented without instruction timing adjustment, then transmission speed is improved, but signal collisions occur at the receiving end
Solution Approach 1:
The patent applies preliminary action by adjusting the timing of control instructions before optical burst transmission occurs. The instruction output adjustment unit pre-calculates and sets the optimal timing for control instructions based on the data signal transmission timing. This preliminary timing adjustment ensures that optical bursts from multiple subscribers are synchronized to arrive at the station without collision, maintaining both high speed and reliability.
3Quantity of substance
If optical TDMA communication is enabled, then fiber installation cost is reduced through PON topology, but complex timing control of optical bursts is required
Solution Approach 1:
The patent merges the timing control functionality into the existing Ethernet controller architecture rather than requiring separate dedicated timing control hardware. The control circuit integrates multiple functions (data signal transmission control, optical signal control, and timing adjustment) into a unified system. This merging approach enables PON topology cost benefits while keeping the added complexity manageable through functional integration.
Data Source
AI summary
Transmitting devices used in an optical access system in which a plurality of the transmitting devices transmit an optical burst signal to a receiving device by time division multiple access, the transmitting devices each including an arithmetic processing unit, the arithmetic processing unit including: a data signal transmission instruction unit, the a data signal transmission instruction unit that outputs a first instruction for controlling transmission processing of a data signal on the basis of a requester's instruction; an optical signal control instruction unit that outputs a second instruction for controlling output processing of an optical signal on the basis of the requester's instruction; and an instruction output adjustment unit that adjusts a timing at which the first instruction is output and a timing at which the second instruction is output.