The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Modulation responses of a 3s-DBR laser are studied by numerical simulations, which are based on calculation of transient impulse response of the device with the developed TWDM model. Simulated results indicate that this method provides an effective way to estimate modulation bandwidth of the 3s-DBR laser.
The wavelength convertor will be a key component in future optical reconfigurable networks in order to reduce the number of power-hungry high-speed optical-electronic-optical conversions at networks nodes [1]. Even though FWM-based wavelength conversion of advanced modulation formats have already been demonstrated in [2, 3] using static, fixed-wavelength lasers; wavelength convertors with rapid, dynamic...
We demonstrate a dynamically reconfigurable SOA-based all-optical wavelength convertor for QPSK data at 12.5 GBuad using a fast switching tunable laser as one of the pump sources. The experimental results indicate that it is feasible to build fast reconfigurable wavelength convertors with <30 ns switching time.
A tunable dual-mode operation with three-section distributed Bragg reflector (DBR) laser is proposed for compact and low-cost microwave generation. Stable dual-mode operation with 7 nm tuning range is demonstrated.
In telecommunication and sensing arenas, InP-based Photonic Integrated Circuits (PICs) have been found compelling improvements in cost and function as well as size, weight and power consumption. A serious thermal management challenge has been put forward to high-density PICs designs, particularly for laser arrays. Employing 3D heat conduction equation and finite element method (FEM), this paper presents...
Effect of nonlinear gain on the phase noise of Y-branch lasers is studied by numerical simulations, which are based on the developed transmission line model (TLM) and multimode rate equations superposed by Langevin noise sources and nonlinear gain terms. The nonlinear gain is found to have severe effects on the phase noise of the Y-branch lasers.
We proposed a novel temperature-dependent model of an SOA integrated in SG-DBR laser module based on finite element method (FEM). Static and transient temperature distributions of the integrated module are simulated by numerically solving the thermo-optical coupling equations. Phenomenon of thermal crosstalk was conspicuously observed. Furthermore, thermally induced wavelength drift of the module...
Thermal relaxation time can be critical in high speed optoelectronic devices. In this paper, a three-dimensional thermal model of a semiconductor laser package is developed by the finite element method. A proper designed proportion-integration-differentiation loop is designed for temperature managing. Factors affecting thermal relaxation time in the device are analyzed. Thermal time constant of thermistor...
We propose a novel chirp compensation scheme for directly modulated 3s-DBR lasers in TWDM-PON to realize long reach dispersion-tolerant uplink. Extensive numerical simulations are carried out to demonstrate its effectiveness..
Power distribution room is the key position of the power supply system, it is very important to monitor power distribution room and real time warning in order to ensure the normal power supply. A design of a detection system based on Zig Bee wireless sensor network, the hardware based on CC2530, software development based on Zig Bee. Designing a novel microstrip antenna because of the harmonic interference...
The paper extend a integrated TLLM model to investigate the characteristics of directly modulated semiconductor lasers (DMLs). The model combines an equivalent circuit laser model and a transmission-line laser model (TLLM) for both electrical and optical issues. Microwave aspects such as high-frequency parasitic effects and impedance matching networks of laser diodes can be included in equivalent...
The paper extend a integrated TLLM model to investigate the characteristics of directly modulated semiconductor lasers (DMLs). The model combines an equivalent circuit laser model and a transmission-line laser model (TLLM) for both electrical and optical issues. Microwave aspects such as high-frequency parasitic effects and impedance matching networks of laser diodes can be included in equivalent...
We present a time-domain traveling wave dynamic model for simulation of wavelength tunable three-section slotted Fabry-Perot semiconductor lasers. The slot structure is characterized by using the boundary conditions of the optical fields propagating through the slot facets. Static and dynamic wavelength switching characteristics are simulated. Good agreements have been found between the simulation...
Widely tunable lasers are expected to be used in coherent optical communications as primary laser sources for a more agile optical network. Sampled grating distributed Bragg reflector (SGDBR) lasers have been proven to be a good candidate for these applications. SGDBR lasers, which are multi-section lasers, exhibit a more complex linewidth broadening than fixed-wavelength semiconductor lasers1. To...
We demonstrate for the first time a detailed phase noise characterization of Y-branch lasers. BER tests of 10.7GBaud DQPSK revealed the effect of phase noise at frequencies around the relaxation oscillation peak on system performance.
A widely tunable distributed Bragg reflector (DBR) laser with gratings of simpler structure compare to other types of widely tunable (around 100 nm) lasers is proposed for achieving wide wavelength tuning range (> 100 nm), which consists a front reflector based on a normal sampled grating (SG) with a small duty ratio (the ratio of the grating pitch length to the sampling period), and a rear reflector...
We propose a small-signal circuit model for a sampled grating distributed Bragg reflector (SGDBR) laser monolithically integrated with a semiconductor optical amplifier (SOA). The modulation response of different levels of the SOA-integrated SGDBR laser has been analyzed by this model including parasitic effect.
A bidirectional beam propagation method (BPM) is introduced to describe the relationship between the related parameters and the insertion loss of fiber Fabry-Perot filter. The numerical simulation results indicate that the method can provide a simple and useful way for the device design.
We demonstrate tunable ultra-wideband (UWB) pulse generation by direct current modulation of a semiconductor optical amplifier (SOA) section of an SOA-integrated sampled grating distributed Bragg reflector (SGDBR) laser.
In order to achieve high precision positioning with high reliability, the integration of GPS and interferometric Quantum Positioning System (QPS) is proposed. The integration of these two systems will provide a better Position Dilution of Precision (PDOP) and make the Double Difference Integral Ambiguity (DDIA) of GPS L1 carrier phase fix within a few epochs, thus it can improve the integrity and...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.