Fast-synchronization and low-timing-jitter self-clocking concept for 160 Gbit/s optical time-division multiplexing...

Area of Science:

• Optoelectronics
• Optical Communications
• Signal Processing

Background:

• High-speed optical data transmission demands efficient clock recovery at the receiver.
• Traditional clock recovery methods often require complex and power-hungry components like ultrafast phase comparators and phase-locked loops.
• Minimizing timing jitter and ensuring clock stability are critical for reliable data demultiplexing.

Purpose of the Study:

• To propose and demonstrate a simplified self-clocking method for optical data signals.
• To eliminate the need for complex receiver circuitry in clock recovery.
• To evaluate the performance of the proposed method in terms of synchronization speed, timing jitter, and clock stability.

Main Methods:

• A self-clocking technique based on in-band clock pilot insertion into the transmission data signal.
• Demonstration using a 160 Gbit/s optical time-division multiplexing (OTDM) data signal.
• Transmission over a 51 km optical fiber link.

Main Results:

• Successful clock recovery without an ultrafast phase comparator or phase-locked loop.
• Achieved fast synchronization, low timing jitter, and a highly stable recovered clock.
• Demonstrated error-free operation for 160 to 40 Gbit/s demultiplexing with a 10 dB clock dynamic range and a 1.1 dB power penalty.
• The recovered clock exhibited no patterning effect.

Conclusions:

• The proposed in-band clock pilot insertion method offers a simplified and effective approach to clock recovery in high-speed optical systems.
• This technique significantly reduces receiver complexity and cost.
• The method ensures robust performance, enabling reliable high-speed optical data transmission and demultiplexing.