Munseob Lee

A Single-Chip 2.5-Gb/s Burst-Mode Optical Receiver With Wide Dynamic Range

In this letter, a new burst-mode optical receiver with burst detection function is proposed and a single-chip 2.5-Gb/s burst-mode optical receiver has been fabricated using 0.25-μm SiGe bipolar complementary metal-oxide-semiconductor (BiCMOS) technology. The single-chip optical receiver has high sensitivity and wide dynamic range for various classes of power budges required in 10-Gigabit-capable passive optical network (XG-PON1) (2.5-Gb/s upstream and 10-Gb/s downstream data rates). For the 2.5-Gb/s burst-mode data streams, sensitivity and overload were -32 and -4 dBm at a bit-error rate of 10-10 , respectively, resulting in a dynamic range of 28 dB.

The SFP transceiver for 10Gbps asymmetric next generation-PON ONT

We present the first cost-effective 10 Gbps SFP transceiver module as ONT solution for both NG-GPON and NG-EPON compliant in asymmetric architecture.

Remote Fault Detection Method for Time-Slot-Violated Terminal Using Periodic Probing Signal in TDM-PON

Remote faulty terminal detection method in the time-division-multiplexing passive optical networks is crucial, especially for the time-slot-violated faulty terminals. We previously demonstrated a detection method using a periodic probing signal. In this paper, we explain the method in details and analyze its performance limitation in multiple terminal cases to evaluate the validity scope of this method. Using a random process model, we show that the proposed method can detect the probing signal even though there is one 15-dB-stronger pseudorandom-binary-sequence bit-stream (PRBS)-type faulty signal using a receiver with the bandpass filters bandwidth below 0.47 MHz (Q = 21.3). This result shows that the proposed method can be useful for the current 1 Gbps gigabit-capable passive optical network (G-PON) and ethernet PON (E-PON) standards.

XG-PON1 OLT transceiver with a single-chip burst-mode receiver

We present the design and evaluation of a 10-gigabit small form factor pluggable transceiver with a prototype single-chip burst-mode receiver, a signal detection circuit, and a clock-data-recovery device for 2.5 Gbit/s upstream in the ITU-T G.987.2 recommendation.

2.5Gb/s GPON single-chip burst-mode receiver

This is the first 2.5 Gb/s burst-mode receiver that satisfies GPON timing specification. The single-chip receiver IC archives -25.5 dBm sensitivity, 21 dB dynamic range, 18.5 dB loud/soft ratio with p-i-n photodiode.

Low Cost WDM-PON source amplification scheme using bidirectional semiconductor linear optical amplifier

A cost-effective and compact WDM-PON source amplification scheme with bidirectional semiconductor optical amplifier is firstly demonstrated. A linear optical amplifier is used as a bidirectional amplifier to obtain the gain clamping of downstream channels and suppress the cross-gain modulation between upstream and downstream channels. We show the experimental results including the transient responses with a dynamic wavelength channel add/drop in WDM-PON.

Target recognition and phase acquisition by using incoherent digital holographic imaging

In this study, we proposed the Incoherent Digital Holographic Imaging (IDHI) for recognition and phase information of dedicated target. Although recent development of a number of target recognition techniques such as LIDAR, there have limited success in target discrimination, in part due to low-resolution, low scanning speed, and computation power. In the paper, the proposed system consists of the incoherent light source, such as LED, Michelson interferometer, and digital CCD for acquisition of four phase shifting image. First of all, to compare with relative coherence, we used a source as laser and LED, respectively. Through numerical reconstruction by using the four phase shifting method and Fresnel diffraction method, we recovered the intensity and phase image of USAF resolution target apart from about 1.0m distance. In this experiment, we show 1.2 times improvement in resolution compared to conventional imaging. Finally, to confirm the recognition result of camouflaged targets with the same color from background, we carry out to test holographic imaging in incoherent light. In this result, we showed the possibility of a target detection and recognition that used three dimensional shape and size signatures, numerical distance from phase information of obtained holographic image.

Hologram acquisition by using time resolved heterodyne method in optical scanning holography

We propose the new hologram acquisition method based on the time resolved heterodyne analysis in optical scanning holography. By applying the FFT or four phase picking algorithm, we obtain complex hologram without reference signal.

Hologram Acquisition by Using Time Resolved Analysis in Optical Scanning Holography

We propose the new hologram acquisition method based on the time resolved analysis in optical scanning holography. By applying the Fourier transform or four phase shifting algorithm, we can obtain complex hologram without reference clocking.

Bi-directional ONT Module for Asymmetric 10Gbit/s PON

We have developed the first bi-directional ONT transceiver module having 10Gbit/s-Rx and 1.25Gbit/s-Tx for asymmetric high-speed TDM-PON, and have confirmed the 10Gbit/s downstream performance with the bi-directional transmission to support 128-way split and 10km reach.