Byeong-hoon Park

Operation of 1550-nm electroabsorption-Modulated laser at 40/spl deg/C for 10-gb/s, 40-km transmission

Semicooled operation at 40/spl deg/C of electroabsorptive modulator integrated laser (EML) for intermediate reach communication has been demonstrated. Reproducible operation at the elevated temperature was achieved through a device parameter optimized based on the temperature dependence of the dc characteristics of EML and a design of multi-quantum-well structure providing both relevant output power and high-frequency bandwidth at 40/spl deg/C. Good eye pattern and near zero chirp with the average power over 0 dBm are obtained at 40/spl deg/C, with an estimated lifetime over 20 years.

Monitor-photodiode integration in the amplifier- and modulator-integrated DFB laser diode

Monitor photodiode (MPD) is monolithically integrated in the antireflection output window region of the amplifier- and modulator-integrated laser diode. The MPD is electrically isolated from the other components by semi-insulating InP regrowth with total leakage current less than 1 /spl mu/A. The MPD responsivity to the output power is tailored through its location and size, and about half decibel power loss is achieved for 4% responsivity. The reliability is demonstrated through the accelerated aging test.

Design of amplifier- and modulator-integrated laser diode for 10-Gb/s 80-km transmission

We present the amplifier- and modulator-integrated laser diode designed for 10-Gb/s transmission over 80-km distance. An antireflection window structure is implemented at the tilt facet of the amplifier to reduce optical feedback by 40 dB. A monitor photodiode is monolithically integrated in the antireflection window region for accurate power regulation. To better control the amplifier input power and to reduce the feedback of amplified spontaneous emission, an attenuation inner-window is incorporated by removing a section of the waveguide. The reproducibility of the chip fabrication process is tested to confirm the design margin. Through amplifying the modulated signals and reducing modulator chirp by amplifier saturation, high-power optical transmission is demonstrated.

Transmission over 80 km at 10 Gb/s Using the Amplifier- and Modulator-Integrated Laser Diode

We demonstrated the transmission over 80 km at 10 Gb/s by using the amplifier and electroabsorption-modulator integrated laser diode. Tilt-facet antireflection window is implemented, inside of which a monitor photodiode is monolithically integrated for accurate power regulation. To better control the amplifier-input power and to reduce the feedback of the amplified spontaneous emission, an attenuator is incorporated by means of the inner-window. By amplifying the modulated signal and compensating modulator-chirp by gain-saturation in the amplifier, high power optical transmission is achieved from a device with -10 dB attenuation at total laser and amplifier currents of 200 mA.

Attenuation inner-window in the amplifier- and modulator-integrated laser diode

To better control the input power of an amplifier, which is monolithically integrated with an electroabsorptive-modulated laser, an inner window is implemented by removing a section of the waveguide to realize an attenuator. It also reduces the effect of amplified spontaneous emission on the integrated laser. Attenuation around -10 dB is obtained by adjusting the length of the inner window. Because of different focal depths, unguided stray light from the inner window is not coupled to a fiber on which the amplifier output is focused through a lens.

P‐188: Field Sequential Type 3D Pico‐Projector Phone Based on 1GHz Mobile Application Processor and nHD DMD Chipset

In this paper, we present the first 3D pico-projector phone platform which adopted a field sequential type nHD DLP-based projector module and the mobile application processor S5PC111. With 1.5ms of 3D glass blank time and maximally 12 lumen picoprojector engine, we obtained about 30% of optical efficiency at 1W LED power consumption.

14.3: Distinguished Paper: White Point Calibration of Color Sequential Mobile Projector

Color sequential RGB LED driving architecture becomes popular for mobile projectors of which the output are under 10 lumens. One of the difficulties of color sequential projector lies in how to make white balance by mixing RGB color. LED bins and coupling tolerance are diverse so that they have sensitive effects on color temperature distribution. In this paper, the analyses of color temperature distribution and a practical calibration method will be presented.