Investigation of multiwavelength clock recovery based on heterodyne beats of sideband-filtered signal

• Published in: Optics communications Vol. 271; no. 1; pp. 87 - 90
• Main Authors: von Lerber, T., Tuominen, J., Ludvigsen, H., Honkanen, S., Küppers, F.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01-03-2007; Elsevier Science
• Subjects: All-optical devices; Applied sciences; Exact sciences and technology; Optical communications; Optical telecommunications; Parallel processing; Resonators; Telecommunications; Telecommunications and information theory; Parallel processing; Optical communications; All-optical devices; Resonators; Local oscillator; Optical telecommunication; Multifrequency laser; Wavelength division multiplexing; Cavity resonator; Optical resonator; Optical clocks; Clock recovery
• ISSN: 0030-4018; 1873-0310
• DOI: 10.1016/j.optcom.2006.09.043

We investigate a new parallel all-optical clock recovery scheme based on heterodyne beats of an optical sideband-filtered signal. The oscillating clock signal is recovered when the filtered sideband is combined with a stable local oscillator. The filtering is performed with an optical resonator, which by nature provides possibility for multiwavelength operation. The local oscillator could be realized by a multiwavelength laser, whose emission wavelengths are injection seeded with carrier wavelengths of the input data. The output signal of such a configuration benefits from a reduced bit-pattern effect and a stable offset level. The sideband filtering is demonstrated for 23 simultaneous channels at 100GHz DWDM grid, each hosting a data stream of 10Gbit/s.