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Updated: Jun 22, 2026

Quasi-light Storage for Optical Data Packets

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Published on: February 6, 2014

Optical minimum-shift keying with external modulation scheme.

Takahide Sakamoto, Tetsuya Kawanishi, Masayuki Izutsu

|June 6, 2009

Summary

This summary is machine-generated.

We developed a new optical phase control method for minimum-shift keying (MSK) modulation. This technique compensates for frequency-shift keying (FSK) phase jumps, enabling more compact modulation spectra and 10-Gbit/s data transmission.

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Last Updated: Jun 22, 2026

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Published on: March 20, 2017

Area of Science:

Optical communications
Signal processing
Modulation techniques

Background:

External frequency-shift keying (FSK) modulation suffers from optical phase discontinuities.
These discontinuities can limit spectral efficiency and signal quality.
Minimum-shift keying (MSK) offers advantages but requires careful phase management in external modulation.

Purpose of the Study:

To propose and validate an optical initial phase control technique for external MSK modulation.
To compensate for phase jumps inherent in FSK modulation.
To achieve a more compact modulation spectrum compared to conventional binary phase-shift keying (BPSK).

Main Methods:

Development of an initial phase controller integrated with an FSK modulator.
Numerical simulations to analyze the modulation spectrum.
Experimental demonstration of the technique at a data rate of 10 Gbit/s.

Main Results:

The proposed technique effectively compensates for optical phase discontinuities.
The MSK signal achieved a more compact modulation spectrum than conventional BPSK.
Successful experimental demonstration of 10-Gbit/s external modulation in MSK format.

Conclusions:

The optical initial phase control technique is effective for external MSK modulation.
This method enhances spectral efficiency by reducing modulation bandwidth.
The demonstrated 10-Gbit/s transmission validates the practical applicability of the technique.