Pochi Yeh

National Yang Ming Chiao Tung University

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

Claire Gu

University of California, Santa Cruz

Scott Campbell

University of South Florida

John Hong

Sensors (United States)

Ian McMichael

Jet Propulsion Laboratory

Xianmin Yi

University of California, Santa Barbara

M. Khoshnevisan

Griffith University

Arthur Chiou

National Yang Ming Chiao Tung University

Wood-Hi Cheng

National Chung Hsing University

Weishu Wu

Sichuan Agricultural University

Q. Byron He

University of Oxford

Cooperative Institutions

Rockwell Automation (United States)

University of California, Santa Barbara

National Sun Yat-sen University

National Yang Ming Chiao Tung University

California Institute of Technology

National Taiwan University

Tsinghua University

Chinese Academy of Sciences

Jet Propulsion Laboratory

Pennsylvania State University

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Broadband Chromium-Doped Fiber Amplifiers for Next-Generation Optical Communication Systems

Journal of Lightwave Technology (2012)

Szu-Ming Yeh Sheng‐Lung Huang Yi‐Jen Chiu Hidenori Taga Pi Ling Huang

We report the first experimental breakthrough of a net gain of optical signals in a broadband chromium-doped fiber amplifier (CDFA) for next-generation optical communication systems. Current fiber amplifiers, including commercial erbium-doped fiber amplifier, cover only a relatively small portion of the entire transmission bandwidths (1300-1600 nm) of the low-loss windows of silica fibers. The newly developed CDFAs have opened up the possibility of utilizing the 300-nm entire spectrum of the low-loss fibers to further increase the transmission capacity. In this paper, we present the experimental demonstration of a net gain of 1.2 dB employing gain enhancement technique. With the help of an optical-fiber system examination for the CDFA, a 40-Gb/s error-floor free data transmission was successfully demonstrated by realizing the high-speed transmission of signal with gain through the chromium-doped fibers (CDFs). Further gain improvement in the CDFAs employing few-mode or single-mode CDFs will be presented and discussed.

10.1109/jlt.2012.2182758

Cite

Citations (29)

Reduction of Rayleigh scattering in nonlinear optical phase conjugations by photo-induced density redistribution in atomic vapors

Journal of the Optical Society of America A (1998)

Mitsuhiro Yokota Pochi Yeh

We investigate the reduction of Rayleigh scattering in four-wave mixing due to photo-induced spatial redistribution of atoms in atomic vapors. The Rayleigh scattering from the pump beams in optical phase conjugation is a major source of noise, which affects the fidelity of the phase-conjugated image. In the blue-shifted operation, the atoms are driven toward the low-intensity regions of the standing-wave pattern, leading to a reduction of Rayleigh scattering. We also investigate the effect of saturation on the differential scattering cross section.

Redistribution

Four-wave mixing

10.1364/josaa.15.002678

Cite

Citations (1)

Modified-signed-digit arithmetic for multi-input digital optical computing

Applied Optics (1994)

Shaomin Zhou Scott Campbell Weishu Wu Pochi Yeh Hua‐Kuang Liu

We propose and demonstrate a modified-signed-digit (MSP) arithmetic to achieve multi-input digital optical computing. Our approach utilizes hybrid addition–subtraction transformation (or weight operation) rules among multiple inputs. This results in operation speeds that exceed those of two-input MSD arithmetic for multi-input computing. Optical implementation of the proposed multi-input MSD arithmetic by utilizing spatial data encoding and an optical fan-out element is also presented and experimentally demonstrated.

Optical computing

Subtraction

Numerical digit

10.1364/ao.33.001507

Cite

Citations (10)

The First Nonlinear Optics: Materials, Phenomena, and Devices Conference

Robert T. Wangemann Hyatt M. Gibbs Juan F. Lam D. G. Steel Pochi Yeh

Source

Cite

Citations (0)

Optical restoration of photorefractive holograms through self-enhanced diffraction

Optics Letters (1995)

Claire Gu Shuian Huei Lin Scott Campbell Pochi Yeh Chau-Jern Cheng

For the first time to our knowledge, we demonstrate the use of self-enhanced diffraction to optically restore weak dynamic volume holograms. This restoration process is achieved through the use of a novel beam-toggling scheme that significantly enhances the steady-state diffraction efficiency of volume index gratings stored in photorefractive media. Experiments demonstrating and confirming theory are presented and discussed.

Diffraction efficiency

Volume hologram

10.1364/ol.20.000330

Cite

Citations (10)

Correction of polarization and modal scrambling in multimode fibers by phase conjugation

Optics Letters (1987)

Ian McMichael Pochi Yeh Paul Beckwith

When polarized light is incident upon a long multimode fiber, the emerging light is randomly distributed among the spatial and polarization modes. We present experimental and theoretical results demonstrating that recovery of the spatial and polarization modes of the incident light takes place only when a phase conjugator at the fiber output preserves polarization on reflection.

Scrambling

Phase conjugation

Ray

Modal dispersion

10.1364/ol.12.000507

Cite

Citations (36)

Grating response time of photorefractive KNbO/sub 3/:Rb/sup +/

Proceedings of 1994 Nonlinear Optics: Materials, Fundamentals and Applications (2002)

Yuheng Zhang Sara L. Campbell Pochi Yeh Dezhong Shen Xiaoyan Ma

Photorefractive crystals play an increasingly important role in optical information processing. Some of these crystals have been used in a variety of optical computing applications. The photorefractive response time is a critical issue because it directly determines the processing speed of the devices. Crystals that are widely used at present, such as BaTiO/sub 3/, LiNbO/sub 3/, and SBN, etc., are relatively slow when the light intensity is 1 W/cm/sup 2/. Semiconductor crystals such as GaAs and GaP have a higher speed but suffer from small coupling constants. For high processing speed, KNbO/sub 3/ has the best promise because it has the highest figure of merit among the oxide photorefractive crystals. Volt et. al studied the photorefractive response time of KNbO/sub 3/:Fe. They found that reduction of the crystal could decrease the response time by several orders of magnitude. However, such KNbO/sub 3/ crystals often become optically inhomogeneous after reduction. In this paper, we report our investigation of the transient photorefractive response of KNbO/sub 3/:Rb/sup +/ crystals, which exhibit a fast response time while maintaining a significant gain and good optical homogeneity for information processing applications.< >

Potassium niobate

Figure of Merit

Response time

10.1109/nlo.1994.470818

Cite

Citations (0)

Beam Coupling With Photorefractive Materials

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (1989)

Pochi Yeh

This paper describes various beam coupling phenomena in photorefractive materials (e.g., BaTiO3, SBN, BSC)) ana their applications for wavefront control of laser beams. These beam coupling phenomena include two-wave mixing, four-wave mixing, self-pumped phase conjugation and mutually pumped phase conjugation.

Phase conjugation

Four-wave mixing

10.1117/12.960251

Cite

Citations (0)

Doppler-free phase-conjugate reflection

Optics Letters (1984)

Pochi Yeh M. D. Ewbank M. Khoshnevisan John M. Tracy

It is shown that the reflection from a phase-conjugate mirror does not exhibit a Doppler shift in frequency. The physical basis for this phenomenon is discussed, and it has been verified experimentally by using four-wave mixing with photorefractive Bi(12)SiO(20) (BSO) in a phase-conjugate Michelson interferometer. The same measurement is also used to determine the response time of the nonlinear material to moving spatial holograms. This response time is 7.3 msec in BSO.

Phase conjugation

Reflection

Four-wave mixing

Conjugate

10.1364/ol.9.000041

Cite

Citations (10)

Fidelity of image restoration by partial phase conjugation through multimode fibers

Optics Communications (1995)

Scott Campbell Pochi Yeh Claire Gu Q. Byron He

Phase conjugation

High fidelity

Conjugate

Aperture (computer memory)

10.1016/0030-4018(94)00522-v

Cite

Citations (8)