Robust optical control of an optical-amplifier-based flip-flop

Area of Science:

• Optoelectronics
• Photonics
• Semiconductor Devices

Background:

• Semiconductor optical amplifiers (SOAs) are key components in optical communication systems.
• Controlling the latchable output power of SOAs is crucial for digital optical processing.
• Existing methods for controlling SOA power can be complex or inefficient.

Purpose of the Study:

• To demonstrate novel optical techniques for externally controlling the latchable output power of SOA-based flip-flops.
• To utilize cross-phase modulation (XPM) for precise refractive index manipulation.
• To enable efficient digital optical processing functions.

Main Methods:

• Employing optical 'set' signals (1533-1568 nm, low microwatts) to decrease carrier density and refractive index.
• Utilizing optical 'reset' signals (1306 and 1466 nm, milliwatts) to generate carriers and increase refractive index.
• Leveraging cross-phase modulation (XPM) for all-optical control of SOA flip-flop states.

Main Results:

• Demonstrated external control of latchable output power in SOA-based flip-flops.
• Achieved precise refractive index modulation via optical set and reset signals.
• Identified specific wavelengths and power levels for effective optical control (set: 22 microW, reset: <1 mW).

Conclusions:

• The presented optical techniques offer efficient and precise control over SOA flip-flop output power.
• These methods are suitable for implementing digital optical processing functions like bit-length conversion, retiming, and demultiplexing.
• This work advances the development of all-optical signal processing systems.