[Show abstract][Hide abstract] ABSTRACT: A tunable interactive fiber laser with continuous broad tunability of over 11 nm by using a miniature thermal tuning fixture is presented. For efficient utilization of the 980 nm laser diodes pump to boost the high performance interactive fiber laser output power, the tunable interactive fiber laser is arranged in a master-oscillator-and-power-amplifier (MOPA) structure with an output power of over 62 nW and a low relative intensity noise. The structure consists of a phase-shifted DFB fiber laser sandwiched in the middle by two fiber Bragg gratings of a DBR fiber laser. The interactive fiber laser exploits the advantages of low noise and stable single frequency operation of the phase-shifted DFB laser.
[Show abstract][Hide abstract] ABSTRACT: In this letter, an interactive fiber laser is analyzed and experimentally demonstrated with results showing good performance in high-output power, accurate wavelength control and low relative intensity noise of less than -160 dB/Hz. It has a high-wavelength stability better than /spl plusmn/0.0006 nm measured for 24 h of operation, a high output power of over 166 mW and a laser sidemode suppression of over 52 dB with dual LD pump at 980 and 1480 nm in an MOPA structure. The fiber laser has a temperature-stabilized package with a wavelength temperature coefficient of -0.00028 nm//spl deg/C.
No preview · Article · Feb 1999 · IEEE Photonics Technology Letters
[Show abstract][Hide abstract] ABSTRACT: Tunable fiber lasers find important applications in advanced lightwave communications, measurement and sensor technologies. Wide λ-tuning range and continuously tuning capability are important particularly for widely used dense WDM networks with add/drop and cross-connecting capabilities
[Show abstract][Hide abstract] ABSTRACT: Dense WDM (DWDM) technology with a small channel spacing of 0.8 nm
or less plays an important role. There is a requirement for
high-performance DWDM multiplexers and demultiplexers for the available
flat gain wavelength range of erbium-doped fiber amplifiers (EDFAs). In
this paper, we report DWDM devices with a channel spacing of 0.4 nm by
using apodized fiber Bragg grating (FBGs) and bandpass WDM filters
[Show abstract][Hide abstract] ABSTRACT: The authors report high performance dense WDM multiplexers and
demultiplexers with a 0.4 nm channel spacing. Special apodised fibre
Bragg gratings (FBGs) and low loss bandpass WDM filters are utilised.
The demonstrated cost effective eight-channel dense WDM devices have a
high channel isolation of >25 dB and an insertion loss of ~7.5 dB.
The WDM devices can be expanded to 32 or 64 channels in the same
No preview · Article · Feb 1998 · Electronics Letters
[Show abstract][Hide abstract] ABSTRACT: Dense WDM systems demand fibre Bragg gratings (FBG) with low
sidelobes and a sharp spectral skirt. A new apodised phase mask is
reported here for efficiently suppressing sidelobes in FBG production. A
20 dB sidelobe reduction, measured by both an OSA and a tunable laser
scanning technique, was achieved. The skirt steepness, which is a ratio
of the FBG reflection bandwidth at -25 dB to the bandwidth at -0.5 dB,
was demonstrated to be 1.85. The FBGs are suitable for dense WDM with a
channel spacing of <0.8 nm
No preview · Article · Nov 1997 · Electronics Letters
[Show abstract][Hide abstract] ABSTRACT: Photonic true time-delay technique provides weight, size, EMI/EMP
and cost advantages for constructing squint free phased array antennas.
The photonic true time-delay networks demand high performance, high
reliability wavelength tunable and multi-wavelength laser sources. This
paper reports the hermetically sealed rapid-tuning tunable lasers and
ultra-stable multi-wavelength laser diode and fiber laser sources. These
devices have narrow linewidth, low intensity and phase noise, high
side-lobe suppression, etc
[Show abstract][Hide abstract] ABSTRACT: Fiber Bragg grating based fiber optic devices are discussed for
phased-array system applications. These devices include fiber grating
time-delay element, several fiber grating related laser sources and
wavelength division multiplexer and demultiplexer. Detailed structures
and performance of the fiber grating-based fiber optic devices are also
[Show abstract][Hide abstract] ABSTRACT: A fiber grating stabilized diode laser source with precision
wavelength control, excellent spectral stability and a hermetically
sealed modified butterfly package is reported here. The new source also
has a high sidelobe suppression and very stable output power
[Show abstract][Hide abstract] ABSTRACT: Two-stage double-pass EDFA with a broadband flat gain is constructed in a hermetically sealed package. The EDFA has a low noise-figure of 4 dB, a high output power exceeding 15 dBm and a /spl plusmn/0.2 dB gain flatness over a 30 nm bandwidth.
[Show abstract][Hide abstract] ABSTRACT: Summary form only given. The ordinary Er-doped fiber amplifiers (EDFAs) are constructed using several discrete components, including a pump laser diode (LD) packaged in a butterfly or TO package, a fused biconical WDM coupler, a fiber pigtailed isolator, a large size beam splitter and a packaged photodetector (PD).
[Show abstract][Hide abstract] ABSTRACT: Summary form only given. In summary, a high-speed polarization insensitive broadband 1×8 LiNbO<sub>3</sub> fiber-optic switch module with gain has been demonstrated. It has an insertion gain of -4 dB, a polarization sensitivity of 0.2 dB and a good output uniformity. The fiber-optic switch is expected to have a switching time of subnanosecond when the traveling-wave electrodes with adequate impedance and velocity match are optimized for the Mach Zehnder switching elements.