Optical Transceiver Pathloss Optimization for Transmission Distance
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Solution Overview
Problem
The trend towards smaller and lower cost components in optical fiber communications systems reduces the transmission distance of long-distance fiber optic communication, as the lower power output from miniaturized transceivers leads to uneven amplification, noise, and reduced detectability, limiting the distance signals can travel effectively.
Innovation Solution
Individual power measurement and adjustment of each transceiver's output to provide an optimal spectral profile for the optical amplifier, accounting for predetermined wavelength-specific losses to ensure even amplification across channels, thereby maximizing transmission distance while maintaining signal detectability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If smaller and lower cost components are used in optical transceivers, then device cost and power consumption are reduced, but transmission distance deteriorates due to lower power output
Solution Approach 1:
The patent adjusts the optical output power of individual transceiver channels based on measured pathloss characteristics. By dynamically changing the power parameter for each wavelength channel according to its specific loss profile, the system compensates for the lower power output of miniaturized transceivers and maintains adequate signal strength over long transmission distances.
2Volume of moving object
If smaller and lower cost components are used in optical transceivers, then device size is reduced, but transmission distance deteriorates due to lower power output
Solution Approach 1:
The system compensates for the reduced power output of compact transceivers by dynamically adjusting the optical output power parameter for each channel based on measured pathloss. This allows small-form-factor transceivers to achieve long transmission distances through intelligent power management rather than relying on larger, higher-power components.
3Length of stationary object
If individual power adjustment for each transceiver channel is implemented, then transmission distance is optimized, but device complexity increases
Solution Approach 1:
The system performs self-characterization by automatically measuring the pathloss for each transceiver channel and storing these characteristics in lookup tables. This self-service approach eliminates the need for external calibration equipment or complex manual configuration, reducing operational complexity while enabling optimized power adjustment for each channel to maximize transmission distance.
Solution Approach 2:
The patent implements preliminary measurement and characterization of each transceiver channel's pathloss before normal operation. By pre-measuring and storing loss characteristics in lookup tables, the system prepares optimization data in advance, allowing rapid power adjustment without adding complexity to the real-time transmission system.
4Length of stationary object
If power output from miniaturized transceivers is increased, then transmission distance is improved, but noise and uneven amplification increase
Solution Approach 1:
The patent applies different power output settings to each individual wavelength channel based on its specific pathloss characteristics. Instead of uniformly increasing power across all channels (which would cause uneven amplification and noise), the system locally optimizes each channel's power level, ensuring even amplification by the optical amplifier while maintaining adequate signal strength for long-distance transmission.
Data Source
AI summary
Methods include, for each of a plurality of pluggable optical transceivers that are fiber-coupled to respective inputs of a passive wavelength division multiplexer having a predetermined loss profile defining a path specific loss between each input and a common output, sending an optical output signal along an optical signal path while the other optical transceivers of the plurality are not sending optical output signals and measuring an optical power of the sent optical output signal at an input of a local optical amplifier downstream from an output of the wavelength division multiplexer, wherein the local optical amplifier is configured to transmit the optical output signals to a distant location, and, based on the measured optical powers, determining a loss distribution across the optical output signals at the input of the local optical amplifier by subtracting the predetermined path specific losses of the wavelength division multiplexer, comparing a variation in the loss distribution to a nominal variation to determine a defect in a transceiver fiber path associated with a higher loss component of the distribution where the variation exceeds the nominal variation, comparing an average or maximum loss in the loss distribution to a nominal average or maximum allowable loss to determine a defect in a common fiber path downstream from the multiplexer, and adjusting one or more of the optical powers of the optical output signals produced by the optical transceivers before transmission through the multiplexer, by an optical power offset that produces a predetermined flat optical power spectrum profile at the input of the local optical amplifier and that increases a transmission distance over which the optical output signals decodably propagate.