All-optical XOR and XNOR operations at86.4 Gb/s using a pair of semiconductor optical amplifier Mach-Zehnder interferometers.

We propose a method for increased-speed all-optical XOR operation using semiconductor optical amplifiers. We demonstrate XOR and XNOR operations at 86.4 Gb/s using a pair of photonic-integrated semiconductor optical amplifier Mach-Zehnder interferometers.

A hybrid electroabsorption modulator device for generation of high spectral-efficiency optical modulation formats.

We report a novel hybrid integrated optic device consisting of AlGaInAs/InP electroabsorption modulators and a four-arm silica-on-silicon planar lightwave circuit optical interferometer. The device is designed for generation of high spectral efficiency optical modulation formats. We demonstrate generation of 21.4 Gb/s quadrature phase shift keyed optical signals with electrical data drives of 2V(pp) amplitudes, achieving a bit error rate of 10(-9) with the required optical signal to noise ratio of ~18 dB in a 0.1 nm resolution bandwidth.

Laboratory calibration of the Extreme-Ultraviolet Imaging Spectrometer for the Solar-B satellite.

The laboratory end-to-end testing of the Extreme-Ultraviolet Imaging Spectrometer (EIS) for the Solar-B satellite is reported. A short overview of the EIS, which observes in two bands in the extreme-ultraviolet wavelength range, is given. The calibration apparatus is described, including details of the light sources used. The data reduction and analysis procedure are outlined. The wavelength calibration using a Penning source to illuminate the aperture fully is presented. We discuss the aperture determination using a radiometrically calibrated hollow-cathode-based source. We then give an account of the predicted and measured efficiencies from consideration of the efficiencies of individual optical elements in first order, an account of efficiencies out of band when radiation incident in one band is detected in the other, and efficiencies in multiple orders. The efficiencies measured in first order for in band and out of band are compared with the predictions and the sensitivity, and its uncertainties are derived. Application of the radiometric calibration is discussed.

Single-frequency 1559-nm erbium-doped fiber laser pumped by a 650-nm semiconductor laser.

A single-frequency laser with a 2-cm-length erbium-doped fiber and fiber-grating coupler mirrors was operated successfully with a 650-nm semiconductor pump laser. Laser pump threshold was 0.91-mW and 34- ?W output power at 1559 nm was obtained for 6-mW pump power.

Transient gain and cross talk in erbium-doped fiber amplifiers.

Transient gain saturation and recovery with 110-340-microsec time constants were observed in erbium-doped fiber amplifiers. This slow response reduces the effects of saturation-induced cross talk and intermodulation distortion associated with multichannel signal amplification. In a two-channel amplification experiment, negligible saturation-induced cross talk was measured at signal modulation frequencies >5 kHz. Increased suppression of saturation-induced cross talk was achieved through feed-forward compensation to reduce low-frequency gain fluctuations.

Efficient erbium-doped fiber amplifier at a 1.53-microm wavelength with a high output saturation power.

An efficient erbium-doped fiber amplifier providing gains from +25 to +37 dB with pump powers at lambda = 1.49 microm in the 11-54-mW range is described. Corresponding saturation output powers of +2.5 to +11 dBm were achieved. A maximum gain coefficient of 2.1 +/- 0.1 dB/mW was measured, which is to our knowledge the highest value reported for erbium-doped fiber amplifiers pumped near lambda = 1.49 microm and matches previously reported results for a lambda = 980-nm pump.