Abstract

We propose and demonstrate a method of detecting the optical carrier frequency of an optical data stream using a disk-shaped wavelength-tunable optical bandpass filter operated in the synchroscan mode. The method is based on a differential technique that uses an S-shaped curve obtained from divided data streams. A bidirectional configuration with a delay line enables the data streams not only to pass through the filter at a different time but also to enter each photodiode at the same time. Consequently, pattern-oriented noise, which degrades the accuracy, can be eliminated by an optimized low-pass filter. An experimental demonstration carried out for optical signals with a non-return-to-zero format 2^7 - 1 pattern at 150 Mbit/s verifies the method. A high resolution of 100 MHz is achieved with a filter having a transmission bandwidth of 0.06 nm. This performance is promising for photonic networks that manage a large number of optical channels multiplexed in the frequency domain.

© 2004 Optical Society of America

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Appl. Opt. (6)

IEEE J. Lightwave Technol. (1)

B. S. Glance, J. Stone, K. J. Pollock, P. J. Fitzgerald, C. A. Burus, Jr., B. L. Kasper, and L. W. Stulz, "Densely spaced FDM coherent star network with optical signals confined to equally spaced frequencies," IEEE J. Lightwave Technol. 6, 1770-1781 (1988).

IEEE J. Photon. Technol. Lett. (3)

H. Suzuki, J. Kani, H. Masuda, N. Takachio, K. Iwatsuki, Y. Tada, and M. Sumida, "1-Tb/s (100 x 10 Gb/s) super-dense WDM transmission with 25-GHz channel spacing in the zero-dispersion region employing distributed Raman amplification technology," IEEE J. Photon. Technol. Lett. 12, 903-905 (2000).

B. C. Collings, M. L. Mitchell, and W. H. Knox, "A 1024 channel WDM system," IEEE J. Photon. Technol. Lett. 12, 906-908 (2000).

Y. Katagiri, Y. Tachikawa, K. Aida, S. Nagaoka, and F. Ohira, "Synchroscanned rotating tunable optical disk filter for wavelength discrimination," IEEE J. Photon. Technol. Lett. 10, 400-402 (1998).

IEEE J. Sel. Areas Commun. (1)

R. Olshansky, R. Gross, and M. Schmidt, "Subcarrier multiplexed coherent lightwave systems for video distribution," IEEE J. Sel. Areas Commun. 8, 1268-1275 (1990).

IEEE Photon. Technol. Lett. (2)

R. Gross, R. Olshansky, and P. Hill, "Five-channel coherent heterodyne subcarrier multiplexed system," IEEE Photon. Technol. Lett. 1, 179-181 (1989).

Y. Katagiri, K. Aida, Y. Tachikawa, S. Nagaoka, H. Abe, and F. Ohira, "High-accuracy laser-wavelength detection using a synchroscanned optical disk filter," IEEE Photon. Technol. Lett. 11, 102-104 (1999).

Rev. Sci. Instrum. (2)

L. P. Howard and J. A. Stone, "Differential wavelength meter for laser tuning," Rev. Sci. Instrum. 68, 1648-1651 (1997).

J. E. Fredrickson, "Precision wavelength measurements in near infrared," Rev. Sci. Instrum. 44, 52-55 (1973).

Other (2)

T. Ono, H. Shimizu, S. Yamazaki, and K. Emura, "Feasibility study on common polarization control for coherent FDM transmission system," in Proceedings of the Optical Fiber Communication Conference (OFC 1989) (Optical Society of America, Washington, D.C., 1989), paper TuB6-5.

H. A. Macleod, Thin-Film Optical Filters (Adam Hiiger, Bristol, England, 1986).

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