Samsung Electronics Co., Ltd.

Yonsei University

Sang-Kook Han

Joo-youp Kim

Seong-Joong Kim

Young-Il Son

Won-Ho Shin

A wireless optical transceiver, comprising: a light splitter for splitting light emitted from a light source into two lights; a data converter for dividing input data into a plurality of divided data in a symbol unit of a predetermined number of bits, and for converting values of a phase bit and a duty bit at a predetermined position in each of the divided data into a phase control signal and a blocking control signal; a modulator for polarization phase modulating two lights split according to the phase control signal, and for conveying or blocking two modulated polarized lights in response to the blocking control signal to modulate a pulse position; a polarized light combiner for generating a transmission optical signal by combining two polarized lights with a modulated polarization phase and a modulated pulse position; and a light amplifier for amplifying the transmission optical signal and transmitting it through a standby channel.

Wireless optical transceiver based on polarization pulse position and differential phase shift modulation and method thereof

Disclosed is an apparatus in a diversity system of a mobile terminal having a main receiving unit and a sub-receiving unit, which includes a sub-antenna for receiving an input signal and a part of a transmitted signal of a transmitting unit, a band-pass filter (BPF) designed to greatly attenuate a low-band frequency of the part of the transmitted signal received through the sub-antenna, a high-pass filter (HPF) for additionally attenuating the part of the transmitted signal attenuated through the BPF, a low-noise amplifier for minimizing a noise of an output value of the HPF, an HPF for passing therethrough only a high-frequency component of an output value of the low-noise amplifier, and a mixer for mixing output values of the HPF and outputting a baseband signal. One of two BPFs in the sub-receiving unit is replaced by one HPF, and thus the HPF can be fabricated on chip with the terminal receiving unit. Additionally, through the on-chip HPF, the use of an additional BPF is eliminated, and the size and the unit price of production of the mobile terminal can also be reduced.

Apparatus for suppressing cross modulation noise in diversity system of mobile terminal receiver

A phase optimization apparatus and method to obtain a maximum extinction ratio by feeding back a portion of an optical signal output from a Mach-Zehnder interferometer wavelength converter using XPM of a semiconductor optical amplifier to maintain an optimum phase difference between two arms. The phase optimization apparatus includes a first arm having a first semiconductor optical amplifier that amplifies a pump signal and a probe signal, a second arm having a second semiconductor optical amplifier that amplifies the probe signal, and a &#x3c0; phase shifter that controls the phase of the amplified signal, an optical band-pass filter that filters optical signals to output only the modulated probe signal; and a phase control unit that receives feedback to output to the &#x3c0; phase shifter of the second arm a phase control signal, which controls a phase difference between the first and second arms.

Phase optimization apparatus and method for obtaining maximum extinction ratio in mach-zehnder interferometer wavelength converter using cross phase modulation of semiconductor optical amplifier

A method and apparatus for controlling an optical gain difference and an optical phase difference in a semiconductor optical amplifier&#x2014;Mach-Zehnder interferometer (SOA-MZI) wavelength converter having two arms and that outputs probe output signals Pand P, corresponding to pump input signals of logic high and logic low, respectively. The controlling includes detecting an optical power level of the output probe signals and controlling at least one of an optical gain difference between the two arms and an optical phase difference between the two arms in accordance with a detected optical power level of the probe output signal.

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Seoul, South Korea

Sang-Kook Han