Tunable all-optical NOR gate at 10Gb/s based on SOA fiber ring laser by C. Zhao, X. Zhang, H. Liu, D. Liu, D. Huang Optics Express, v.13, no.8, p.2793, April 18 (2005).

Abstract: A novel scheme for a tunable all-optical logic NOR gate is presented that is based on a semiconductor fiber ring laser. In this new configuration a semiconductor optical amplifier is employed not only as the operational medium for cross-gain modulation effect to form a logic gate, but also as the active medium for a fiber ring laser that is designed to replace the continuous-wave light required in many other schemes. Alloptical logic NOR operation is successfully demonstrated experimentally by use of 10 Gb/s nonreturn-to-zero (NRZ) signals. An output extinction ratio higher than 10.3 dB can be obtained over the 40 nm tuning range except for a 4 nm gap around the input wavelength.

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© 2005 Optical Society of America.

Harmonically mode-locked glass waveguide laser with 21-fs timing jitter by J.E. Malowicki, M.L. Fanto, M.J. Hayduk, and P.J. Delfyett, Jr.; IEEE Photonics Technology Letters, v.17, no.1, p.40 (2005).

Abstract: We report on experimental jitter results of a 10-GHz mode-locked laser. The laser is an actively harmonically modelocked fiber laser using an erbium-doped glass waveguide as the gain medium. Amplitude noise and corresponding phase noise effects are greatly reduced by the inclusion of an intracavity high-finesse fiber Fabry-Pérot etalon. Typical results show timing jitter of 21-fs root mean square, integrated from 10 Hz to 100 MHz.

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© 2005 IEEE. Reprinted, with permission, from IEEE Photonics Technology Letters, v.17, no.1, p.40 (2005)

Rapid amplitude and group-delay measurement system based on intra-cavity-modulated swept-lasers by S. Y. Set, K. Hsu, P. J. Santangelo, C. S. Goh, and K. Kikuchi; Special Joint Issue of the J. Lightwave Technol. and the IEEE Transactions on Instrumentation and Measurement, v.53 p.192 (2004).

Abstract: In this paper, we present a high-speed wavelength-swept laser for application in a real-time optical device characterization system. The system is capable of simultaneous measurement of both the spectral amplitude and group-delay responses of the device-under-test, at a scan rate of 22 Hz over a wide wavelength range of 50 nm. This corresponds to a record sweep rate of >1000 nm/s.

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© 2004 IEEE. Reprinted, with permission, from IEEE Transactions on Instrumentation and Measurement, v.53 p.192 (2004)

Broadband wavelength tunable, single frequency, and single polarization Bismuth Oxide-based Erbium-doped fiber laser by H. Sotobayashi, J. T. Gopinath, Y. Takushima, K. Hsu, and E. P. Ippen; IEEE Photonics Technol. Lett., v.16, no.7, p.1628 (2004).

Abstract: We demonstrate a broad-band wavelength-tunable Bismuth Oxide-based Erbium-doped fiber (Bi-EDF) laser covering both the conventional wavelength band and the long wavelength band. It features single frequency and single polarization oscillation; the former is obtained by making the cavity length short and incorporating an intracavity narrow-band fiber Fabry-Pérot filter, and the latter is achieved with a sigma laser configuration using nonpolarization maintaining fibers. Tuning over 90 nm (1520-1610 nm) is achieved by utilizing the broad gain bandwidth of Bi-EDF amplifier.

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© 2004 IEEE. Reprinted, with permission, from IEEE Transactions on Instrumentation and Measurement, v.53 p.192 (2004)

A 2cm-long mode-locked fiber Fabry-Perot laser (FFPL) incorporating carbon nanotubes by S. Yamashita, Y. Inoue, K. Hsu, S.Y. Set, M. Jablonski, H. Yaguchi, T. Kotake, and K. Sato; Conference on Lasers and Electro-Optics (CLEO-04) (2004).

Abstract: We demonstrate passive mode-locking of short-cavity (~2cm) fiber Fabry-Perot laser by incorporating carbon nanotubes as a saturable absorber. Stable pulses are generated with pulsewidth as short as 0.68ps and repetition rate as high as 5.18GHz.

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Copyright 2004. Used with permission of the authors.

10GHz short-cavity fiber pulsed lasers passively mode-locked using carbon nanotubes by S.Y. Set, S. Yamashita, K. Hsu, K.H. Fong, Y. Inoue, K. Sata, D. Tanaka, and M. Jablonski; Ninth Optoelectronics and Communications Conference/Third International Conference on Optical Internet (OECC/COIN2004).

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Copyright 2004. Used with permission of the authors

Active mode-locking of miniature fiber Fabry-Perot laser (FFPL) in a ring cavity by S. Yamashita and K. Hsu; Electronics Lett., 37, p.1115 (2001).

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Copyright 2001. Used with permission of the authors

Single-polarization generation in fiber Fabry-Perot laser by self-injection locking in short feedback cavity by K. Hsu, S. Yamashita; J. Lightwave Technol., LT-19, p.520, (2001).

Abstract: Single-frequency and single-polarization lasing can be generated in a compact self-injection locked fiber Fabry-Perot laser with a short fiber Bragg grating feedback cavity. No discrete polarization control components are required. Different wavelengths across the laser gain bandwidth can be generated by an appropriate combination of cavity designs and feedback fiber Bragg gratings. A 10-Gb/s nonreturn-to-zero transmission test demonstrates the laser's applicability for optical fiber communications.

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© 2001 IEEE. Reprinted, with permission, from J. Lightwave Technol., LT-19, p.520, (2001)

Tunable erbium-doped fiber ring laser precisely locked to the 50GHz ITU frequency grid by T. Haber, K. Hsu, C. M. Miller, and Y. Bao; IEEE Photonics Technol. Lett., 12, p.1456 (2000).

Abstract: A discretely tunable, single-frequency erbium-doped fiber ring laser demonstrates frequency locking to the 50-GHz ITU frequency grid with an accuracy of 0.3 GHz and stability of 0.05 GHz over a 50-nm tuning range. An output power of 7 mW and an extinction ratio of 45 dB make this single-frequency laser useful for a variety of DWDM applications.

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© 2000 IEEE. Reprinted, with permission, from IEEE Photonics Technol. Lett., 12, p.1456 (2000)

High-performance single-frequency fiber Fabry-Perot laser (FFPL) with self-injection locking by S. Yamashita, K. Hsu, and T. Murakami; Electronics Lett., 35, p.1952 (1999).

Single-frequency, single-polarization operation of tunable miniature erbium:ytterbium fiber Fabry-Perot lasers by use of self-injection locking by S. Yamashita and K. Hsu; Optics Lett. 23, p.1200 (1998).

Abstract: We demonstrate successful single-frequency, single-polarization operation of erbium:ytterbium fiber Fabry-Perot lasers with frequency- and polarization-selective optical feedback, using a fiber Bragg grating and a polarizer. Side-mode suppression greater than 60 dB and pure single-polarization operation were achieved.

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© 1998 Optical Society of America.

Continuously tunable photopumped 1.3mm fiber Fabry-Perot surface-emitting lasers by K. Hsu, C. M. Miller, D. Babic, D. Houng, and A. Taylor; IEEE Photonics Technol. Lett., 10, p.1199 (1998).

© 1998 IEEE.