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Directly modulated green-light diode-pumped solid-state laser for underwater wireless optical communication.
Optics Letters
|April 29, 2017
Summary
Researchers overcame the limited modulation bandwidth of diode-pumped solid-state lasers (DPSSLs) for underwater optical communication. They achieved high-speed green-light signal transmission using orthogonal frequency-division multiplexing and power loading.
Area of Science:
- Optoelectronics
- Optical Communication
- Signal Processing
Background:
- Diode-pumped solid-state lasers (DPSSLs) are known for limited modulation bandwidth.
- High-speed, high-power, and high-beam-quality green-light signals are crucial for underwater wireless optical communication.
Purpose of the Study:
- To explore direct modulation of DPSSLs for high-speed underwater optical communication.
- To overcome the bandwidth limitations of DPSSLs.
Main Methods:
- Implemented orthogonal frequency-division multiplexing (OFDM) and power loading strategies.
- Utilized a compact DPSSL from a low-cost laser pointer.
- Tested transmission over a 2m and 6m underwater channel.
Main Results:
- Achieved net bit rates of 108.55 Mb/s (64-QAM) and 89.55 Mb/s (32-QAM) at 2m.
- Maintained bit error rates (BER) below the forward error correction (FEC) limit at 6m transmission distance.
Conclusions:
- The proposed strategy effectively circumvents DPSSL bandwidth constraints.
- High-speed underwater wireless optical communication is feasible using modulated DPSSLs.
