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An all-optical multi-wavelength converter using absorption modulation of an injection-locked Fabry-Perot laser diode (FP-LD) is demonstrated at 2.5 Gb/s. The multi-wavelength converter can simultaneously provide 1 to 4 channel outputs and support both inverted and non-inverted conversion. By optimizing the wavelength of pump signal and polarization states of pump, probes, and the FP-LD, all converted outputs show high extinction ratio and negligible crosstalk power penalty. The results guarantee to increase the number of output channels. The proposed scheme can be applied to multicasting functions as well as 1xN wavelength conversion in an all-optical wavelength division multiplexed network. Keywords: wavelength conversion, Fabry-Perot laser diode, injectionlocking, multicasting Classification: Photonics devices, circuits, and systems References[1] J. M. H. Elmirghani and H. T. Mouftah, "All-optical wavelength conversion: Technologies and applications in DWDM networks," IEEE Commun. Mag., vol. 38, pp. 86-92, March 2000. [2] K. K. Chow and C. Shu, "All-optical wavelength conversion with multicasting at 6 × 10 Gbit/s using electroabsorption modulator," Electron. Lett., vol. 39, no. 19, pp. 1395-1397, Sept. 2003 L. Deming, N. J. Hong, and L. Chao, "Wavelength conversion based on cross-gain modulation of ASE spectrum of SOA," IEEE Photon. Technol. Lett., vol. 12, no. 9, pp. 1222-1224, Sept. 2000 H. Yoo, Y. D. Jeong, Y. H. Won, M. Kang, and H. J. Lee, "All-optical wavelength conversion using absorption modulation of an injection locked Fabry-Perot laser diode," IEEE Photon.

We have proposed and experimentally verified a pulse-width modulation (PWM) generator which directly generated a PWM signal in the optical domain. Output waveforms were clear at the repetition rate of 16 MHz; the duty cycle (DC) was from 14.7% to 72.1%; and the DC-control resolution was about 4.399 %/dB. The PWM generator's operation principle is based on the injection-locking property of a single-mode Fabry-Pérot laser diode (SMFP-LD). The SMFP-LD, which has a self-locked mode wavelength at λPWM, was used to detect the power of the injection-locking signal (optical analog input). If the analog input power is high, the SMFP-LD is locked to the wavelength of the input signal λa and there is no output after an optical bandpass filter (OBF). If the analog input power is low, the SMFP-LD is unlocked and there is output signal at λPWM after the OBF. Thus, the SMFP-LD plus the OBF provide digital output for an analog input. The DC of the output PWM signal can be controlled by tuning the power of the analog input.

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