A novel temperature sensor based on injection fiber Bragg grating laser with wavelength and temporal domain demodulation is proposed and demonstrated experimentally. The proof of concept device consists of a DFB laser modulated by a RF signal as injection light, a fiber Bragg grating laser, an optical spectrum analyzer, and a digital oscilloscope. The dynamic range of the proposed sensor is explored. The results demonstrate the new concept of temperature sensors and the technical feasibility for temperature measurement.
In this paper, a ring cavity passively mode-locked fiber laser using a semiconductor saturable absorber mirror as
saturable absorber and a fiber Bragg grating as dispersion compensator, is proposed and experimentally demonstrated,
its output performance is discussed. Stable mode-locking spectrum with 3dB bandwidth of 3.2nm, center wavelength
of 1555.8nm and average output power of 0.32mW is observed at the pump power of 110mW. The pulse repetition
rate is 25 MHz, as determined by the cavity length of ~8m in case of the output sech2 transform-limited pulse, the
output pulses duration of 0.79ps and single pulse energy of 12.64pJ are obtained.
In this presentation, we propose and experimentally demonstrate a novel optical generation of microwave and
millimeter wave signals by using asymmetric fiber Bragg grating Fabry-Perot cavity fiber laser, dual-wavelength
emission can be achieved with wavelength separation of 0.68nm corresponding to the millimeter wave signal at
85GHz. By appropriately adjusting the operation temperature of intracavity fiber Bragg grating, the frequency of
millimeter wave signal generated can be tunable. Our experimental results demonstrate the new concept of optical
generation of microwave and millimeter wave signals by using asymmetric fiber Bragg grating Fabry-Perot cavity
dual-wavelength fiber laser and the technical feasibility.
We report a temperature and pressure sensor based on fiber Bragg grating(FBG) lasers, the analytical expressions for
the shift of the Bragg wavelength with temperature and pressure are derived, the effect of operation temperature of
fiber Bragg grating on the central wavelength of fiber Bragg grating laser is discussed experimentally. The result
demonstrates that the central wavelength of laser is a function of the operation temperature of FBG, and the
temperature coefficient of the fiber Bragg grating is 1.27×10-5/°C.
In this paper, we propose a nonlinear single-mode fiber FP cavity, in which CRDS is researched theoretically, and the
relationship expression between output electric field amplitude and nonlinear phase shift is derived. Numerical results
demonstrate that the output performance of nonlinear single-mode fiber Fabry–Perot cavity includes three phases:
build-up, stability, and ring-down phase, output power is inversely proportional to the power in the cavity, when the
power in cavity is larger than 2W, the stable time for output signal with instability becomes longer, but the effect of
self-phase modulation on CRD time is ignoring.
KEYWORDS: Extremely high frequency, Single mode fibers, Birefringence, Polarizers, Refractive index, Pulsed laser operation, Heterodyning, Radio optics, Fiber lasers, Lead
In this paper, a novel optical generation of millimeter waves based on the birefringence in a single-mode fiber ring cavity is proposed and investigated theoretically. The input pulsed laser stimulates two orthogonal eigen-modes in a single-mode fiber ring cavity, the birefringence of single-mode fiber causes a phase mismatch for the two eigen-modes, this phase mismatch leads the generation of millimeter waves, out of the ring cavity a pigtail polarizer is used to combine the two eigen-modes, and then the millimeter wave signal is obtained by using heterodyne method. The effects of straight- through coupling coefficients, phase delay factor, and refractive index difference on millimeter wave signal are discussed.
A broadband waveguide amplifier based on long-period waveguide grating and multilayer medium thin film filter is
proposed. The long-period waveguide grating is directly written in the Er-Yb codoped phosphate glass waveguide by
using UV-written technology and the multilayer medium thin film is coated on the output interface of the waveguide.
The light transmission characteristics of the proposed filter are analyzed theoretically. The effects of the transmission
spectra of the filter on the flattening gain spectrum of Er-Yb codoped phosphate glass waveguide amplifier are
discussed. It's demonstrated that the flatness of below 1dB is achieved over a bandwidth of ~ 30nm.
In this paper, we propose an ultrashort pulsed waveguide laser using carbon nanotube saturable absorber integrated
with gain medium, in which the carbon nanotube saturable absorber is directly sprayed on the Er-Yb doped phosphate
glass ion-exchange waveguide, a linear cavity is chosen. The waveguide structure and lasing performance of the
proposed waveguide laser are analyzed theoretically. The effects of the nonlinear coefficient and cavity dispersion on
the output characteristics of the ultrashort pulsed waveguide laser are discussed.
Broadband integrated Er-Yb codoped phosphate glass waveguide amplifier based on cascaded long-period waveguide
grating gain-equalizer is proposed. The proposed cascaded long-period waveguide grating gain-equalizer consists of
some different long-period waveguide grating filtering unit cells, and each cell can suppress certain peak gain at a
specific wavelength. The intrinsical gain spectrum of amplifier is obtained by solving a set of rate and power
propagation equations with overlapping integral-Runge Kutter method. The effect of the transmission spectrum of the
proposed cascaded long-period waveguide grating on the flattening gain of Er-Yb codoped phosphate glass waveguide
amplifier is discussed. The transmission function of the cascaded long-period waveguide grating filter is obtained.
In this paper, we propose and experimentally demonstrate a pressure sensor based on birefringent single mode
fiber FP cavity using optical heterodyne. The proof of concept device consists of a light source, a polarizer controller,
a modulator, a RF generator, a single mode fiber Fabry-Perot cavity, a strain inspector, an erbium doped fiber amplifier,
a filter, a polarizer, an optical spectrum analyzer, and a digital communication analyzer. The dynamic range of the
proposed sensor is explored. The results demonstrate the new concept of fiber pressure sensors and the technical
feasibility for pressure measurements.
In this paper, we propose a novel passively mode-locked waveguide laser using carbon nanotubes saturable
absorber integrated with gain medium, in which the carbon nanotubes saturable absorber is directly sprayed on the
Er-Yb doped phosphate glass waveguide, a ring cavity is chosen. The mode-locking mechanism is the interaction
between the evanescent field of guiding mode and the carbon nanotubes. An elementary research on the proposed
passively mode-locked waveguide laser is presented.
In this paper, we report on a method of developing a fiber pressure sensor using a conceptually new approach:
optical clock recovery. This system consists of three parts: 10GHz RZ-modulated signal source, pressure sensor, and
detection. The pressure sensor part consists of single-mode fiber resonator (SMFR) with stress pressure, birefringent
resonator and a polarizer. The elementary theoretical results are given. It is demonstrated the validation of the
proposed solution.
Noise and quantum conversion efficiency(QCE) of ytterbium-doped fiber amplifier are researched theoretically in this paper. From the rate and propagation equations describing ytterbium-doped fiber amplifier system, the noise and QCE are calculated, and the effect of pump power, Yb doped concentration, and device length on noise and QCE is also discussed with 975nm pump wavelength.
This paper addresses on the theoretical analysis of a novel active ring microresonator filter, which is designed on
Er-Yb co-doped phosphate glass. The filter characteristics of the proposed filter is analyzed by transfer matrix method,
some universal relations for coupling of optical power between microresonator and dielectric waveguides and pump
power are presented. The analytical expressions of filter bandwidth, free spectral range, and finesse are derived.
Numerical results demonstrate that the change of pump power does not alter the resonance performance of ring
micro-resonator filter, the improvement of which will have important effect on output characteristics of filter: reducing
the filter bandwidth and increasing the finesse of the resonator filter.
Based on Er-Yb co-doped phosphate glass substrate, tunable single micro-ring filter using thermo-optic effect is proposed and analyzed theoretically. The analytical expressions of the transmission performance, bandwidth and finesse of the proposed ring resonator filter are derived using transfer matrix method, the calculated temperature coefficient of center wavelength is 0.011nm/°C. Numerical results demonstrate that bandwidth and finesse of the filter can be adjusted by varying the input pump power.
In this paper, a four-channel waveguide amplifier array based on Er-Yb co-doped phosphate glass is proposed and theoretically designed, the performance of multi-wavelength amplification of the proposed Er-Yb co-doped phosphate glass waveguide array is investigated by numerical calculation. As example, the amplification characteristics of the proposed array for four wavelengths, 1539.4nm, 1540.2nm,1542.0nm and 1541,8nm, is discussed.
This paper addresses the fabrication of thermal ion-exchange waveguides and error analysis in m-lines technology. Planar waveguides are fabricated on home-made Er-Yb co-doped phosphate glass substrate by thermal ion-exchange method, the effect of exchange temperature, anneal time, exchange time, and molten salt composition on the refractive index profile is investigated using m-line technology and uncertainty of measurement is also given.
In this paper, a new and simple numerical computational method simulating the gain characteristics of erbium and ytterbium co-doped phosphate glass waveguide amplifier is presented. This algorithm is the wavelets based Finite-Differences Time-Domain Method, which takes advantage of compression properties of wavelet transforms. Especially multi resolution analysis (MRA). Simulation results show the validity of the algorithm.
Er3+-Yb3+ co-doped phosphate glass waveguide amplifier at large signal operation are theoretically studied. By solving the rate and optical power propagation equations describing the Er3+-Yb3+ co-doped system, quantum conversion efficiency(QCE) at large operation are optimized. It is shown that improvement of Er3+-concentration and increase of amplifier length can improve QCE, improvement of Yb3+-concentration reduces QCE, the rate of 1~2 of Er3+-Yb3+ co-doped concentration is available.
In this paper, characteristics of erbium-ytterbium co-doped phosphate glass waveguide amplifier integrated with multilayer medium thin film filter is designed theoretically, a S-type geometry waveguide structure is used to achieve a long path in a compact chip, and obtained higher gain with lower Er-doped concentration. The multilayer medium thin film filter is utilized to achieve a broader flattening gain bandwidth. The intrinsical gain spectrum is obtained by solving rate and power propagation equations, the effect of transmittance spectrum of thin film filter on flattening gain is discussed. Average gain of about 17dB is obtained between 1535nm and 1565nm with gain difference of below 3dB.
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