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Complex modulation and detection with directly modulated lasers.

Qian Hu, Di Che, Yifei Wang

|December 25, 2015

Summary

This summary is machine-generated.

This study enhances optical signal recovery by combining intensity and phase information from directly modulated lasers (DMLs). This novel approach significantly improves receiver sensitivity for high-speed data transmission.

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Area of Science:

Optical Communications
Signal Processing
Photonics

Background:

Directly modulated lasers (DMLs) carry modulation information in both optical signal intensity and phase due to the chirp effect.
Recovering signals using only intensity information limits receiver sensitivity.
Incorporating phase information offers a significant advantage for signal recovery.

Purpose of the Study:

To analyze two schemes for recovering directly modulated signals using combined intensity and phase information.
To demonstrate the first-ever intensity and phase combined recovery for polarization-division-multiplexed (PDM) directly modulated signals.
To evaluate the performance improvement in receiver sensitivity compared to intensity-only recovery.

Main Methods:

Analysis of signal recovery schemes utilizing both intensity and phase modulation.
Experimental demonstration of intensity and phase combined recovery for PDM signals.
Performance evaluation based on receiver sensitivity and data rate.

Main Results:

Successful demonstration of intensity and phase combined recovery for PDM directly modulated signals.
Achieved a data rate of 40 Gb/s over a 160 km transmission distance.
Receiver sensitivity improvements of 5.5 dB and 10 dB were observed with the two proposed schemes compared to intensity-only recovery.

Conclusions:

Combined intensity and phase recovery significantly enhances receiver sensitivity for DML signals.
The demonstrated technique is effective for high-speed PDM optical communication systems.
This approach offers a promising solution for improving the performance of optical receivers.