Browsing by Author "Yeh, CH"

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120-nm bandwidth erbium-doped fiber amplifier in parallel configuration
(2004-07-01)
Yeh, CH
;
Lee, CC
;
Chi, S
;
光電工程學系
;
Department of Photonics
A new S- to L-band erbium-doped fiber amplifier (EDFA) module, which reaches 120-nm gain bandwidth of 1480 to 1600 nm, has been experimentally investigated and demonstrated by using coupled structure. A 32.8-, 34.7-, and 38.1-dB peak gain is obtained at 1504, 1532, and 1568 nm, respectively, when the input signal power is -30 dBm. In addition, this proposed amplifier also provides a broad-band amplified spontaneous emission (ASE) light source of 1480-1606 nm with the output level above -40 dBm.
A bidirectional 2 x 2 optical switch technique using absorption or amplification function of erbium-doped fiber
(2005-10-01)
Yeh, CH
;
Lee, CC
;
Chi, S
;
光電工程學系
;
Department of Photonics
A novel bidirectional 2 x 2 optical switch technique, based on conventional erbium-doped fibers (EDFs) that operate at a pumped or unpumped power level, is proposed and demonstrated experimentally. By using the amplification and absorption functions of EDFs and a simple architecture design, the input signals can be switched to a suitable port. The response time of wavelength switching approaches about 2 ms. Moreover, the behavior and system performance of the proposed configuration are also studied.
A broadband fiber ring laser technique with stable and tunable signal-frequency operation
(2005-07-11)
Yeh, CH
;
Chi, S
;
光電工程學系
;
Department of Photonics
A C- plus L-band fiber ring laser with wide wavelength tunability and single-longitudinal- mode oscillation is proposed and demonstrated experimentally. A saturable-absorber-based autotracking filter, consisted of an unpumped erbium-doped fiber (EDF) and an optical reflected mirror (ORM), is employed to provide fine mode restriction and guarantee the single-frequency operation. Output power of >2.1 dBm, power stability of <= 0.02 dB, wavelength variation of <= 0.01 nm and side-ode suppression ratio (SMSR) of >31 dB / 0.05 nm have been experimentally demonstrated for this single-frequency fiber laser over an operating range of 1550 to 1608 nm. (C) 2005 Optical Society of America.
A broadband fiber ring laser technique with stable and tunable signal-frequency operation: erratum (vol 13, pg 5240, 2005)
(2005-08-22)
Yeh, CH
;
Chi, S
;
光電工程學系
;
Department of Photonics
We present the corrected version of Fig. 4 below with the original caption. (c) 2005 Optical Society of America.
A gain-clamped S-band erbium-doped fiber amplifier using fiber Bragg grating
(2006-05-15)
Yeh, CH
;
Lin, MC
;
Chi, S
;
光電工程學系
;
Department of Photonics
We propose and investigate experimentally a gain-clamped S-band erbium-doped fiber amplifier module, employing a fiber Bragg grating to serve as a reflected element to lase a saturated tone injected into the module, by forward optical feedback method. In addition, different injected powers of the saturated tone are used to realize the performances of gain and noise figure for the proposed amplifier over the effectively wavelength range of 1478-1520 nm. (C) 2005 Elsevier B.V. All rights reserved.
A one-step single-cleaning solution for CMOS processes
(2003-09-01)
Chao, TS
;
Yeh, CH
;
Pan, TM
;
Lei, TF
;
Li, YH
In this paper, we demonstrate a one-step single-cleaning solution to replace the conventional RCA two-step cleaning method for complementary metal oxide semiconductor (CMOS) processes. We found the performance of devices fabricated using this new recipe is comparable or even better than that of devices fabricated using the conventional RCA method. The benefits of this method are more efficient removal of contaminants, improved driving current of devices, simpler processing, fewer steps in cleaning, time savings, reduction of cost and of chemical waste, and reduced impact on the environment. (C) 2003 The Electrochemical Society.
A stabilized and tunable erbium-doped fiber ring laser with double optical filter
(2004-03-01)
Yeh, CH
;
Lee, CC
;
Chen, CY
;
Chi, S
;
光電工程學系
We have proposed and experimentally demonstrated a stabilized and tunable erbium-doped fiber ring laser by using a Fabry-Perot laser and a fiber Fabry-Wrot filter. The sidemode suppression ratio of >30 dB/0.1 nm and the output power of >2.2 dBm can be achieved while this ring laser is tuned from 1528.28 to 1559.64 nm with the step of 1.12 nm. The wavelength variation of less than 0.01 nm and the power fluctuation of less than or equal to0.04 dB have also been obtained. When the constant output power is controlled by adjusting the bias current of 980-nm pump laser, the power variation of less than +/-0.05 dB can be obtained over the entire tunable range.
A tunable and single-frequency S-band erbium fiber laser with saturable-absorber-based autotracking filter
(2005-06-01)
Chien, HC
;
Yeh, CH
;
Lee, CC
;
Chi, S
;
光電工程學系
A method to achieve wavelength tunability and single-longitudinal-mode oscillation in an S-band erbium-doped fiber (EDF) ring laser is proposed and demonstrated. A saturable-absorber-based autotracking filter consisting of an unpumped EDF and an optical reflector is utilized to provide fine mode restriction and guarantee the single-frequency operation. The performance of output power of larger than 1 dBm, power stability of smaller than 0.02 dB, wavelength variation of less than 0.01 nm and side-mode suppression ratio of larger than 31 dB has been experimentally demonstrated for this single-frequency fiber laser operating from 1482 to 1512 nm. (C) 2005 Elsevier B.V. All rights reserved.
A tunable and stabilized single-frequency fiber ring laser based on hybrid amplifier and shorter length EDF with unpumped status
(2006-01-01)
Yeh, CH
;
Fan, KP
;
Chi, S
;
光電工程學系
;
Department of Photonics
A novel fiber ring laser technique, which covers both C- and L-bands, with the function of wavelength tunability and single-longitudinal-mode oscillation, is proposed and demonstrated experimentally. We propose a two-stage hybrid amplifier, which consists of a semiconductor optical amplifier (SOA) and an erbium-doped fiber amplifier (EDFA) with cascade configuration, for the gain profile to achieve C- to L-band (1540 to 1610 nm). A saturated-absorber-based autotracking filter, which composes of an unpumped erbium-doped fiber (EDF) and an optical reflected mirror (ORM), is employed to provide fine mode restriction and guarantee the single-frequency operation. The unpumped EDF must use shorter length to retrieve the stabilized single-frequency operation while the EDF length is between 0.5 to 1 in long. The effectively operation range is from 1542 to 1618 nm. The maximal output power of 5.7 dBm is retrieved at near 1577 nm, and the output power will drop to 3.7 and -0.32 dBm at 1604 and 1616 rim, respectively. The SMSR can be up to 53.2 dB/0.05 nm at around 1577 nm. The performance of output power of > 2.1 dBm, power stability of <= 0.02 dB, wavelength variation of < 0.01 nm and side-mode suppression ratio (SMSR) of > 31 dB/0.05 nm has been demonstrated for this single-frequency fiber laser over the wavelength range of 1550 to 1608 nm. The linewidth (RF) spectrum of the proposed structure has also been studied.
A tunable C-plus-L-band fiber ring laser based on hybrid amplifier
(2004-02-01)
Yeh, CH
;
Lee, CC
;
Chen, CY
;
Chi, S
;
光電工程學系
A tunable C-plus-L-band fiber ring laser, based on a semiconductor optical amplifier, which directly connects an erbium-doped fiber amplifier with a 16 m long erbium-doped fiber, has been proposed and experimentally investigated. A side-mode suppression ratio of > 40 dB/0.1 nm and an output power of >3 dBm in the operating range from 1552 to 1610 nm have been achieved for this ring laser.
A tunable S-band erbium-doped fiber ring laser
(2003-08-01)
Yeh, CH
;
Lee, CC
;
Chi, S
;
光電工程學系
;
Department of Photonics
In this paper, we experimentally investigate and demonstrate an S-band erbium-doped fiber (EDF) ring laser based on an erbium-doped silica fiber and 980-nm pumping laser. Widely tunable range from 1480 to 1522 run, and the sidemode suppression ratio (SMSR) of >30 dB/0.1 nm and the output power of > -2 dBm in the operating range from 1482 nm to 1517 nm have been achieved for this ring laser. Under the constant power control, the output power variation less than +/-0.05 dB can also be accomplished over the tuning range from 1482 to 1517 run. This S-band EDF ring laser is promising for the future S-band applications.
A wavelength converting and switching method based on Fabry-Perot laser diodes
(2005-12-01)
Yeh, CH
;
Chi, S
;
光電工程學系
;
Department of Photonics
We propose and experimentally demonstrate a new wavelength converting and switching technique, which is based on a Fabry-Perot laser diode (FP-LD) pair with optical external injection method. Therefore, adjusting properly bias current levels of FP-LDs can be realized the optical conversion and tuning. For the experimental demonstration,. three different wavelengths [side-mode suppression ratios (SMSRs) are above 20 dB] are converted and the wavelength switching response time is less than 6.8 ns. (c) 2005 Elsevier B.V. All rights reserved.
All optical cross-connect system using erbium-doped fiber-based optical switching unit
(2006-01-01)
Yeh, CH
;
Lee, CC
;
Chi, S
;
光電工程學系
;
Department of Photonics
A novel bidirectional 2x2 optical switch technique, based on the conventional erbium-doped fibers (EDFs) with an operation of pumped or unpumped power level, is proposed and demonstrated experimentally, By using the amplification and absorption function of EDFs and a simply architecture design, the input signals can be switched to a suitable position. The response time of wavelength switching will approach about 2 ms. Moreover, the behavior and system performance of the proposed configuration also have been studied.
Bi-directional hybrid optical fiber amplifier for C or C-plus-L band
(2005-01-01)
Yeh, CH
;
Lee, CC
;
Chi, S
;
光電工程學系
;
Department of Photonics
We have proposed and experimentally demonstrated a bi-directional hybrid optical fiber amplifier, which operates in the ranges of the C and C-plus-L bands simultaneously, based on two erbium-doped' fiber amplifiers (EDFAs) and an semiconductor optical amplifier (SOA). The proposed amplifier also provides C or C-plus-L band amplified spontaneous emission (ASE) light source for fiber sensor and detection applications.
Broadband C- plus L-band double-ring fiber baser based on a two-stage hybrid amplifier
(2005-10-01)
Yeh, CH
;
Cheng, BC
;
Chen, CY
;
Chi, S
;
光電工程學系
A stable and wavelength-tunable C- plus L-band fiber double-ring laser, which uses a two-stage hybrid amplifier with a semiconductor optical amplifier and an erbium-cloped fiber amplifier, has been proposed and experimentally demonstrated. Based on the double-ring configuration, the proposed fiber ring laser exhibits more stable output wavelengths and powers than the single-ring laser. A wide tunable range of 1540 to 1620 nm, a side-mode suppression ratio (SMSR) of > 31.2 dB/0.05 nm over a wide tuning range from 1550 to 1612 nm, and an output power of > 2 dBm over the operation range of 1546 to 1608 nm have been achieved. (c) 2005 Society of Photo-Optical Instrumentation Engineers.
Coupled-structure erbium-doped fiber amplifier with 94-nm bandwidth
(2005-05-01)
Lai, KH
;
Yeh, CH
;
Chi, S
;
光電工程學系
;
Department of Photonics
A novel S- to C-band erbium-doped fiber amplifier (EDFA) module over a 94-nm operation wavelength from 1476 to 1570 nm is experimentally investigated and demonstrated. This proposed module composes an S-band EDFA and a C-band erbium-doped waveguide amplifier (EDWA) with a coupled-structure. The 31.4-dB peak gain with 5.6-dB noise figure, and 30.5-dB peak gain with 4.7-dB noise figure are observed at 1506 and 1534 nm in this configuration when the input signal power is -30 dBm, respectively. (c) 2005 Society of Photo-Optical Instrumentation Engineers.
Dynamic adjustment for gain-clamping erbium-doped fiber amplifier using a backward-injection light
(2005-02-01)
Yeh, CH
;
Chen, CY
;
Chi, S
;
光電工程學系
;
Department of Photonics
Fast tunable laser based on Fabry-Perot lasers with optical injection
(2004-04-01)
Yeh, CH
;
Lee, CC
;
Chi, S
;
光電工程學系
;
Department of Photonics
We have proposed and experimentally demonstrated a new tunable laser structure, which is based on Fabry-Perot (FP) lasers with external lightwave injection. The wavelength tuning can be obtained by adjusting the bias currents of FP lasers. The wavelength tuning time of <2 ns, 3.3-nm tuning range, and the side-mode suppression ratio (SMSR) of >19 dB have been achieved experimentally. In addition, the SMSR performance has also been investigated. This tunable laser has the advantage of simple architecture, potentially low cost, data direct modulation, and fast wavelength tuning, and is expected to benefit the applications of fast wavelength tuning. (C) 2004 Society of Photo-Optical Instrumentation Engineers.
Fast wavelength switching based on a Fabry-Perot laser pair using optical injection
(2004-06-01)
Yeh, CH
;
Lee, CC
;
Chi, S
;
光電工程學系
;
Department of Photonics
We propose and experimentally demonstrate a new fast wavelength-selectable laser technique, which is based on Fabry-Perot (FP) lasers with external light wave injection. By using different bias Currents of FP lasers, wavelength tuning can be realized. In the experiment, the tuning of three different wavelengths tuning, the side-mode suppression ratio of >20dB, and the wavelength switching time of <2 ns were attained.
Fast wavelength-tunable laser technique based on a Fabry-Perot laser pair with optical interinjection
(2004-03-01)
Yeh, CH
;
Lee, CC
;
Hsu, YW
;
Chi, S
;
光電工程學系
A new fast tunable laser technique, which is based on a Fabry-Perot (FP) laser pair with optical interinjection has, been proposed and experimentally demonstrated. By adjusting different bias currents of FP lasers, the wavelength tuning can be realized. In the experimental demonstration a 2.3-nm tuning range with three different wavelengths, the sidemode suppression ratio (SMSR) of >20 dB, and the wavelength switching time of <6.8 ns have been reached. In addition, the SMSR performance versus injection power level has also been investigated. This tunable laser has the advantage of simple architecture data direct modulation, and fast wavelength tuning.