Mingdeh Chien

All-optical Mach-Zehnder wavelength converter with monolithically integrated DFB probe source

The first interferometric wavelength converter with an integrated continuous-wave (CW) probe source is presented. The two-port device operates independent of polarization for a broad range of input wavelengths. The input dynamic range is enhanced by an integrated input preamplifier. Input powers as low as -5.4 dBm in the fiber are converted with penalties as low as 0.6 dB at a bit rate of 2.5 Gb/s. The device is shown to operate with the same low penalty for same-wavelength operation as well. The chirp parameter /spl alpha/ is measured to be 2 for wavelength conversion. No chirp is added to the input signal for same-wavelength operation.

All-optical Mach-Zehnder wavelength converter with monolithically integrated preamplifiers

An interferometric wavelength converter with preamplifiers for both the signal input and the continuous-wave probe input is presented. The dynamic range of the device is enhanced: penalty-free conversion is demonstrated at 2.5 Gb/s for input powers ranging from -6 to +4 dBm. Transmission of the converted signal over 480 km of standard fiber shows penalty improvement relative to the unconverted, information-limited signal.

Reconfigurable optoelectronic wavelength translation based on an integrated electroabsorption modulated laser array

Reconfigurable optoelectronic wavelength conversion to 11 100-GHz spaced wavelengths is achieved using a wavelength selectable laser array with an integrated electroabsorption (EA) modulator at a bit rate of 2.5 Gb/s. Wide dynamic range at the input from -24.2 to -6.5 dBm is achieved and uniform back-to-back transmission performance is measured for all wavelengths.

A wavelength-tunable semiconductor amplifier/filter for add/drop multiplexing in WDM networks

Reconfigurable channel drop in a wavelength-division multiplexed system is demonstrated using a packaged semiconductor amplifier/filter. The filter is electrically tunable over 9.0 nm with a 0.9-nm width and is used with an optical circulator to demultiplex three 5.0-Gb/s WDM channels spaced by 2.25 nm. A receiver sensitivity improvement and low optical crosstalk is observed over a dynamic range of nearly 10 dB.

Wavelength Dependence and Chirp of a Mach-Zehnder Wavelength Converter with Monolithically Integrated DFB Laser

The first interferometric wavelength converter with an integrated CW source is shown to operate with 0.5–0.8 dB penalty at 2.5 Gb/s for wavelength conversion and same-wavelength operation. Fiber coupled conversion gain of up to 7.5 dB is achieved. The chirp parameter α is measured to be 2.

Semiconductor Optical Amplifier Array with Integrated Beam Expanders Coupled to Flat Fibers

A semiconductor optical 9mplifier array with 4 channels is presented. This SOA array was coupled to uncoated, flat end, single mode fibers using integrated adiabatic beam expanders, optical index matching gel, and specifically tailored TiO2 anti-reflection coatings. The TiO2 AR coating overcomes the indices misinatching of fiber glass and InP based device, and reduce optical reflection to 0.002% at 1.55 μm. The average coupling loss is 4.3 dB per facet for the devices measured. Fiber coupled small signal gain for the amplifiers is typically 11.6 dB and a saturation output power of 3.0 dBm. The method of characterization and optimization of the TiO2 coating is discussed.