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Low jittered optical pulse generation from a gain-switched single-mode VCSEL with an external laser beam injection
Hae Won Jung;Seoung Hun Lee;Kyong Hon Kim;Dong Wook Kim;Vijay Manohar Deshmukh;Min Hee Lee
Digest of the 9th International Conference on Optical Internet (COIN 2010)
Year: 2010 | Conference Paper |
Cited by: Papers (1)
We report experimental results on timing-jitter suppressed optical short pulse generation from a gain-switched single-mode vertical-cavity surface-emitting laser (VCSEL) at 1.55 μm wavelength with an external laser beam injection. The low timing-jittered optical short pulses are very useful for high-speed optical time-division-multiplexed (TDM) communications and signal processing. The obtained ti...Show More
ASE reflector-based gain-clamped erbium-doped fiber amplifier using an optical interleaver
Joon Tae Ahn;Hong-Seok Seo;Woon Jin Chung;Bong Je Park;Kyong Hon Kim
IEEE Photonics Technology Letters
Cited by: Patents (2)
We use a 50-GHz optical interleaver for the reflection of amplified spontaneous emission (ASE) to realize ASE reflector-based gain-clamped erbium-doped fiber amplifiers. The amplifier schemes can secure International Telecommunications Union Telecommunication Standardization Sector grids with 100-GHz channel spacing in the whole conventional band (C-band) for signal amplification gain-clamping cha...Show More
Characterization of an ASE reflector-based gain-clamped erbium-doped fiber amplifier
Joon Tae Ahn;Hong-Seok Seo;Woon Jin Chung;Bong Je Park;Kyong Hon Kim
We develop a simulation tool for an all-optical gain-clamped erbium-doped fiber amplifier (GC-EDFA) based on an amplified spontaneous emission (ASE) reflector and thoroughly verify its validity by comparing simulation data with experimental ones. We carry out simulation work as changing conditions like reflection ratio and bandwidth of the ASE reflector, EDF length, and pump power. From this work,...Show More
Polymer wavelength channel selector composed of electrooptic polymer switch array and two polymer arrayed waveguide gratings
Joon Tae Ahn;S. Park;Jung Yun Do;Jong-Moo Lee;Myung-Hyun Lee;Kyong Hon Kim
IEEE Photonics Technology Letters
Cited by: Papers (21)
An all-polymer wavelength channel selector is proposed and fabricated using chip-to-chip bonding of 16-channel electrooptic polymer switch array between two polymer arrayed waveguide gratings for the first time to our knowledge. A low power penalty of 0.1 dB at 10 Gb/s shows its potential as a wavelength channel selector for a packet switching system. Further efforts, however, should be paid to im...Show More
All-optical gain-clamped erbium-doped fiber amplifier with improved noise figure and freedom from relaxation oscillation
All-optical gain clamping scheme of erbium-doped fiber amplifier (EDFA) based on partial reflection of amplified spontaneous emission (ASE) into the EDFA is proposed and successfully demonstrated by using a coarse wavelength division multiplexing coupler with a mirror as an ASE reflector. The proposed gain-clamped EDFA (GC-EDFA) has good gain clamping characteristics up to -12 dBm of input signal ...Show More
Simple method to adjust polarization dependence in polymeric arrayed waveguide gratings
Jong-Moo Lee;S. Park;Myung-Hyun Lee;Joon Tae Ahn;Jung Jin Ju;Kyong Hon Kim
IEEE Photonics Technology Letters
Cited by: Papers (12)
Polarization-dependent wavelength shift of a birefringent-polymeric arrayed waveguide grating (AWG) is found to be adjusted simply by controlling the thickness of the first upper cladding layer while forming the upper cladding by several sublayers. Polarization-dependent wavelength shift is reduced to 0.08 from 4.24 nm in a birefringent-polymeric 16 /spl times/ 16 channel AWG on a silicon substrat...Show More
Trivalent holmium-activated fluoride fiber for potential 1340 /spl sim/ 1400 nm optical amplifiers
Yong Gyu Choi;Bong Je Park;Doo Hee Cho;Hong Seok Seo;Joon Tae Ahn;Kyong Hon Kim
Optical Fiber Communication Conference and Exhibit
Year: 2002 | Conference Paper |
In summary, we propose that Ho/sup 3+/ and Ho/sup 3+//Yb/sup 3+/-doped fluoride glasses are a good candidate material for fiber amplifiers operating at the OH-band of silica fiber for optical transmission. Upconversion excitation in the wavelengths of 880-920 nm and 970-990 nm is achieved for Ho/sup 3+/ single-doped glasses and 910-1000 nm for Ho/sup 3+//Yb/sup 3+/-codoped glasses.Show More
Low input power wavelength converter using a gain-clamped semiconductor optical amplifier
Joon Tae Ahn;Jong Moo Lee;Hong-Seok Seo;Yongsoon Baek;Moon Ho Park;Kyong Hon Kim
The 15th Annual Meeting of the IEEE Lasers and Electro-Optics Society
Year: 2002 | Conference Paper |
A laser wavelength converter using a gain clamped (GC) SOA was proposed for low input power characteristic. Wavelength conversion from communication wavelengths of 1530 to 1560 nm to fixed wavelength of 1510.8 nm was experimentally demonstrated for CW and data at 2.5 Gb/s input signals. Because of high threshold current and high input power coupling efficiency of the GC-SOA the proposed wavelength...Show More
A novel intra-cavity for efficient cascaded Raman generation using WDM couplers
Do Il Chang;Dong Sung Lim;Min Yong Jeon;Hak Kyu Lee;Kyong Hon Kim;Taesang Park;W. Shin;K. Oh
OFC 2001. Optical Fiber Communication Conference and Exhibit. Technical Digest Postconference Edition (IEEE Cat. 01CH37171)
Year: 2001 | Conference Paper |
Cited by: Patents (4)
A novel intra-cavity with a broadband spectral response is designed and demonstrated to deliver a 4th order Stokes cascaded Raman generation. A large transmission bandwidth of 295 nm is realized using the two WDM couplers. The results applied to a Raman fiber laser operating at 1706 nm wavelength using a 1313 nm pump source are reported.Show More
Dual-wavelength cascaded Raman fiber laser
OFC 2001. Optical Fiber Communication Conference and Exhibit. Technical Digest Postconference Edition (IEEE Cat. 01CH37171)
Year: 2001 | Conference Paper |
We have demonstrated a stable and tunable dual-wavelength Raman fiber laser which can be used as a pump source for hybrid type and gain controlled C- and L-band distributed Raman and lumped erbium doped fiber amplifier. A long period grating is used to suppress the gain competition between the two wavelength laser modes and prevent the high order Stokes oscillation. Intensity and wavelength tuning...Show More
All-optical wavelength conversion for 20-Gb/s RZ format data
Min-Yong Jeon;Dong Sung Lim;Hak Kyu Lee;Joon Tae Ahn;Do Il Chang;Kyong Hon Kim;Seung Beom Kang
IEEE Photonics Technology Letters
Cited by: Papers (1)
We have successfully demonstrated an all-optical wavelength conversion scheme for high-speed return-to-zero (RZ) format data input by using a semiconductor-optical-amplifier (SOA) converter incorporated with a stabilized asymmetric Mach-Zehnder interferometer (AMZI). A bit-error-rate penalty of the converted signals less than 1.2 dB compared to that of the back-to-back signals was achieved for the...Show More
Dual-wavelength cascaded Raman fiber laser
Do Il Chang;Dong Sung Lim;Min Yong Jeon;Hak Kyu Lee;Kyong Hon Kim
We have investigated the characteristics of a dual-wavelength cascaded Raman laser based on a composite resonator configuration using a fiber WDM coupler and two pairs of fiber Bragg gratings. The WDM coupler, which served to form a ring cavity and acted as an output coupler simultaneously, made the laser system simple and effective. Since the WDM coupler is made by the fused biconical taper techn...Show More
Transmission wavelength tuning in a stabilized fiber-optic interferometer filter
Joou Tae Ahn;Hak Kyu Lee;Min-Yong Jeon;Dong Sung Lim;Kyong Hon Kim
Technical Digest. CLEO/Pacific Rim '99. Pacific Rim Conference on Lasers and Electro-Optics (Cat. No.99TH8464)
Year: 1999 | Conference Paper |
Many efforts have been paid to develop fiber-optic interferometer filters for WDM applications. Even though several stabilization schemes have been attempted, there is no report made on a scheme offering continuous wavelength tunability. We report the first successful demonstration, to our knowledge, of continuous tuning of transmission wavelength peaks in a stabilized fiber-optic Mach-Zehnder int...Show More
All-optical signal conversions for transparent optical networks
Hak Kyu Lee;Kyong Hon Kim;Min Yong Jeon;Joon Tae Ahn;Dong Sung Lim
Technical Digest. CLEO/Pacific Rim '99. Pacific Rim Conference on Lasers and Electro-Optics (Cat. No.99TH8464)
Year: 1999 | Conference Paper |
Some efforts toward all-optical signal conversions to provide a high degree of transparency and flexibility to high-speed optical communication systems have been reviewed. We briefly review our efforts toward these ends using nonlinear optical effects in optical fibers and semiconductor optical amplifiers.Show More
Cr/sup 4+//Yb/sup 3+/-codoped calcium-aluminate glasses for potentially wide-band optical amplifier materials in 1.23-1.42 /spl mu/m
Technical Digest. CLEO/Pacific Rim '99. Pacific Rim Conference on Lasers and Electro-Optics (Cat. No.99TH8464)
Year: 1999 | Conference Paper |
An efficient pump mechanism is required for the chromium-doped crystals and glasses for laser and amplifier applications. In this paper, Yb/sup 3+/ ion of which strong maximum-absorption is at around 980 nm, is introduced as a sensitizer of Cr/sup 4+/ ion in calcium-aluminate glasses in order to provide a suitable pump band.Show More
All-optical demultiplexing of 20 to 2.5 Gbit/s signals based on an optical parametric loop mirror
Min-Yong Jeon;Hak Kyu Lee;Joon Tae Ahn;Dong Sung Lim;Do Il Chang;Kyong Hon Kim
Technical Digest. CLEO/Pacific Rim '99. Pacific Rim Conference on Lasers and Electro-Optics (Cat. No.99TH8464)
Year: 1999 | Conference Paper |
In recent years, several application schemes based on the four wave mixing (FWM) effect in an optical parametric loop mirror (PALM), such as wavelength interchange, wavelength conversion and spectral inversion, have been proposed. The generated FWM wave in the PALM can be separated from both the input signal and control beams without any optical band pass filter. It appears to be relatively strong...Show More
Multi-color image generation using binary phase holograms
Technical Digest. CLEO/Pacific Rim '99. Pacific Rim Conference on Lasers and Electro-Optics (Cat. No.99TH8464)
Year: 1999 | Conference Paper |
A binary phase hologram (BPH) is a computer generated hologram that is designed to get a two-dimensional spot array of uniform or arbitrary intensity light as a Fourier-Fraunhofer diffraction pattern. By illuminating the hologram with a collimated laser beam and using a Fourier transform lens located right alter the hologram, the output image is obtained at the focal plane of the lens. We report o...Show More
All-optical demultiplexing scheme based on an optical parametric loop mirror
Min-Yong Jeon;Hak Kyu Lee;Joon Tae Ahn;Dong Sung Lim;Do Il Chang;Kyong Hon Kim
Summary form only given. In recent years, several application schemes based on four wave mixing (FWM) effect in optical parametric loop mirror (PALM), such as wavelength interchange, wavelength conversion and spectral inversion, have been proposed. The generated FWM wave appears to be relatively strong compared to the input signal and control beams used in those scheme, and can be easily separated...Show More
Amplitude equalization of laser pulses obtained from rational harmonic mode locking of a ring-type fiber laser
Min-Yong Jeon;Hak Kyu Lee;Joon Tae Ahn;Dong Sung Lim;Ho Young Kim;Kyong Hon Kim;El-Hang Lee
Summary form only given. We have successfully demonstrated amplitude equalization of high repetition-rate optical pulses obtained from a rational harmonic mode locking of a ring-type fiber laser by using a laser injection scheme to another fiber laser with nonlinear optical loop mirror (NOLM).Show More
All-fiber-optic clock recovery from non-return to zero format data
Hak Kyu Lee;Chang Hee Lee;Seung Bum Kang;Min-Yong Jeon;Kyong Hon Kim;Dong Sung Lim;Joon Tae Ahn;Ho Young Kim;El-Hang Lee
Summary form only given. All-optical clock recovery will be an essential part of future all-optical communication systems. Most of the reported all-optical clock recovery schemes to date have been demonstrated based on return to zero (RZ) format data. However, all-optical clock recovery based on non-return to zero (NRZ) format data has been recognized as very difficult to implement because no disc...Show More
Harmonically mode-looked fiber laser using an all-fiber acousto-optic tunable filter
Min-Yong Jeon;Hak Kyu Lee;Kyong Hon Kim;El-Hang Lee;Wang-Yuhl Oh;Byoung Yoon Kim;Hai-Woong Lee
Proceedings of Optical Fiber Communication Conference (
Year: 1997 | Conference Paper |
In conclusion, we report, to our knowledge, the first demonstration ofa new harmonically mode-locked fiber laser scheme using an all-fiber acousto optical tunable filter (AOTF). This laser scheme can be used in generation of the high-repetition-rate mode-locked laser pulses for high-speed fiber-optic communication systems.Show More
All-optical wavelength conversion with use of a cavity-dumped fiber laser with nonlinear optical loop mirror
Hak Kyu Lee;Kyong Hon Kim;Min-Yong Jeon;Joon Tae Ahn;El-Hang Lee
CLEO '97., Summaries of Papers Presented at the Conference on Lasers and Electro-Optics
Year: 1997 | Conference Paper |
First Page of the Article
Show MorePolarization and dispersion dependent passively and actively mode-locked laser outputs of a figure-of-eight type fiber laser
Kyong Hon Kim;Hak Kyu Lee;Joon Tae Ahn;Min-Yong Jeon;Ho Young Kim;Dong Sung Lim;El-Hang Lee
Conference Proceedings LEOS'96 9th Annual Meeting IEEE Lasers and Electro-Optics Society
Year: 1996 | Conference Paper |
In this paper we report experimental results on polarization and dispersion dependent passively and actively mode-locked laser outputs of a figure-of-eight type fiber laser with a nonlinear amplifier loop mirror and an electro-optic modulator. The experimental setup used for our passively and actively mode-locked erbium-doped fiber ring laser operation is similar to that of the conventional figure...Show More
A passively mode-locked fiber laser with an enhanced repetition rate characteristic
Joon Tae Ahn;Hak Kyu Lee;Kyong Hon Kim;Min-Young Jeon;Ho Young Kim;Dong Sung Lim;El-Hang Lee
Conference Proceedings LEOS'96 9th Annual Meeting IEEE Lasers and Electro-Optics Society
Year: 1996 | Conference Paper |
Passively mode-locked erbium-doped fiber lasers (EDFLs) have gathered much attention as ultrashort optical pulse sources. Successful demonstrations of generating passively mode-locked pulses shorter than 100 fs of pulse width have been reported by using a figure-8 laser with a nonlinear amplifying loop mirror (NALM) and a ring laser with stretched-pulse additive pulses. One of the most significant...Show More
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