All-optical frame clock recovery from even-multiplexed OTDM signals

Lina Yin; Guoming Liu; Jian Wu; Jintong Lin

doi:10.1117/12.575658

11 February 2005 All-optical frame clock recovery from even-multiplexed OTDM signals

Lina Yin, Guoming Liu, Jian Wu, Jintong Lin

Proceedings Volume 5625, Optical Transmission, Switching, and Subsystems II; (2005) https://doi.org/10.1117/12.575658
Event: Asia-Pacific Optical Communications, 2004, Beijing, China

Abstract

Frame clock is useful for packet processing such as header detection and payload demultiplexing. A novel all-optical frame clock recovery scheme based on "intensity reshaper" and mode-locked semiconductor fiber ring laser is demonstrated. The "intensity reshaper" including a polarization controller and a polarizer is the key element to realize frame clock recovery from equal-amplitude even-multiplexed OTDM signals. In theory, a mathematical expression is given to analyze the intensity of harmonic of clock-frequency component. The relative intensity of each clock-frequency component will change with the alterative angle caused by adjusting the PC in the "intensity reshaper", so the desirable clock-frequency component can be enhanced, which is helpful for clock recovery. Moreover, the intensity of harmonic of clock-frequency component is also related to the pulse amplitude, width and period in the multiplexed data. In experiment, 2.5GHz frame clock is extracted from even-multiplexed 4x2.5GHz and 8x2.5GHz OTDM signals respectively. At the same time, bit clock is also recovered by using this scheme. The extracted clock pulses have several desirable features such as low timing jitter, broad wavelength tuning range and polarization independence. This scheme simplifies signal generation and propagation in OTDM systems, which can be applied to clock recovery in high-speed OTDM network.

Citation Download Citation

Lina Yin, Guoming Liu, Jian Wu, and Jintong Lin "All-optical frame clock recovery from even-multiplexed OTDM signals", Proc. SPIE 5625, Optical Transmission, Switching, and Subsystems II, (11 February 2005); https://doi.org/10.1117/12.575658

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KEYWORDS

Clocks

Multiplexing

Fiber lasers

Polarization

Polarizers

Mode locking

Modulation

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