Optical Code Multiplex TRIZ Cases
- Frequency-Referenced PON Wavelength Locking With Beat Signals
A broadcast reference signal and beat-frequency loop help PON end nodes lock uplink lasers accurately at assigned wavelengths.
- Free-Space Optical Node Identification with Joined Code Sequences
Narrow optical pulses lower power but hide node identifiers; joining partial code sequences restores identification across distant free-space nodes.
- Variable Spectral Phase Encoder Using Hadamard Code Decomposition
Cascaded 2x2 optical crossbar switches apply Hadamard sequences through fixed Walsh coders, reducing device complexity and enabling microsecond reconfiguration.
- Coherent Gated Receiver for OCDMA Signal Sensitivity
A coherent gated receiver uses a phase mask to decode spatially distributed optical signals.
- CDMA Over WDM Laser Frequency Locking
Superimposing CDMA symbols on WDM channels corrects laser wavelength drift while minimizing crosstalk between adjacent optical channels.
- Terminal Code Word Conflict Resolution in Optical Networks
A terminal device selects a spreading code word and encodes an identifier to verify availability before data transmission.
- Code Cycle Modulation in Optical CDMA Systems
Code cycle modulation selects distinct cyclic shifts of spreading codes to increase user capacity without raising chip rates.
- Optical Carrier Splitting for QAM System Reliability
Single-wavelength optical carriers split into parallel subcarriers enable amplitude spread spectrum modulation using low-speed digital-to-analog converters.
- BBU-RRU Data Transmission via Direct Electrical Interface
Direct electrical BBU-RRU connections eliminate CPRI protocol encapsulation overhead, reducing invalid data volume and the number of required optical fibers.
- Superposition Coding Transmission Device Parallel Decoding
A transmission device superposes modulated symbol streams at a predetermined amplitude ratio for multiplexed signal generation.