2 edition of Analysis of the use of the Mach-Zender coupler in demodulating multiplexed fiber optic signals found in the catalog.
by Naval Postgraduate School, Available from National Technical Information Service in Monterey, Calif, Springfield, Va
Written in English
Fiber optic communications are the future of U.S. Navy shipboard communications. They present tremendous bandwidths with no susceptibility to electro magnetic interference (EMI) and outstanding signal to noise ratios. Current technology uses Wavelength Division Multiplexing (WDM) to allow multiple users on a single fiber simultaneously. The optical filters necessary to demodulate the WDM signal can be expensive. A less costly alternative could be achieved if Hadamard-Walsh Code Shift Keyed (CSK) encoded signals were used. An optical receiver was proposed, using the Mach-Zender coupler, capable of demodulating a Hadamard-Walsh CSK encoded signal. Building on previous work studying the characteristics of the Mach-Zender coupler, a relationship between the probability of bit error and signal-to-noise ratio (SNR) was developed for a single user and a DPSK optical signal. This relationship was then used to develop an understanding of the bit error rate to SNR relationship for a multiple-user CSK optical signal. Using the theoretical performance as a guide, a MATLAB model was then constructed to investigate the sensitivity of the receiver to non-ideal components.
|Statement||Paul W. Wehner|
|Contributions||Naval Postgraduate School (U.S.)|
|The Physical Object|
|Pagination||viii, 59 p. ;|
|Number of Pages||59|
~.tm is split into two waves using a coupler and guided along varying path lengths. The split beams are then recombined to produce phase change. The electro-optic effect states that the change in index of refraction in a material is produced by the application of the electric field. Refractive index of silicon without the electric field is. Fetterman, C.-P. Chao, and S. R. Forrest, “Fabrication and analysis of high-contrast InGaAsP-InP Mach- Zehnder modulators for use at µm wavelength,” IEEE Photon. Technol.
The combination of COMSOL ® products required to model your application depends on several factors and may include boundary conditions, material properties, physics interfaces, and part libraries. Particular functionality may be common to several products. To determine the right combination of products for your modeling needs, review the Specification Chart and make use of a free evaluation. ometer. We are going to use a Mach-Zehnder interferometer to verify the basic principles of polarization, obtainment and eventually the erasure of ‘which-path’ information. This so called ‘erasure’ experiment underpins deep questions about quantum mechanics as we will highlight later.
fiber optics sensors fiber lasers systems The optical index modulation is induced by an electric field into the electro-optic material, and the amplify the electrical signals so as to get modulation signals compatible with the modulators specifications (V). This is achieved by amplifier modules, often called modulator drivers. The Mach-Zehnder interferometer is a particularly simple device for demonstrating interference by division of amplitude. A light beam is first split into two parts by a beamsplitter and then recombined by a second beamsplitter.
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September using the Mach-Zender coupler, capable of demodulating. A fiber-optic Mach-Zehnder interferometer with multimode fibers has been constructed, in which the fringe shift is detected by a spatial filtering detector.
In this interferometer, throughput is much greater than in interferometers using single-mode fibers, but speckles disturb detection of the fringe shift. We have overcome this disadvantage by computer software; the interferometer measured.
Keywords—Electro -optic modulation, bias driver, MachZehnder modulator, modulator drift, harmonic analysis Abstract—An adjustment of operating point significantly affects performance of the analog intensity modulator of Mach-Zehnder type.
Especially, the harmonic distortion figure induced by the. the overall analysis—it makes no difference to the underlying physics. We shall use the following deﬁnitions: l1 and l2 are the total path lengths for the light travelling from the source to the detector for the upper and lower paths respectively.
When the light passes through the glass of the beamsplitters it. Mach-Zender Optical Modulator 4 Introduction cont’d lSilicon in the optical domain: ¡Wavelength and transport medium vary with the application ¡At Intel: developing devices and providing functionality for infrared wavelengths common to silica fiber-optic telecommunications system (silicon nearly transparent).
The above analysis can be generalized and extended to obtain the induced phase changes in an optical fiber due to pressure, temperature or strain variations. The normalized phase changes are as given below.
where, L= length of the fiber, ∆P = change in hydrostatic pressure; p11, p fiber-optic their mitigation in fiber-optic,”  R. David, X. Wang, M. Bernhard, and J. Speidel, “Optimal Modulation Index of the Mach-Zehnder Modulator in a Coherent.
Figure Four-port coupler. We have the number of remaining single waveguides to describe. We can do so in several possible ways and we may recognize another step of flexibility of the method.
First the most accurate way is to simulate them by BPM similarly to the coupler – let us call it total analysis with respect to this approach. are formed using double cladding fiber , micro-cavities , and a twin-core fiber  Mach Zehnder Interferometer based OADMs The main function of an OADM is to add and drop wavelengths (channels) to and from a fiber in wavelength division multiplexed optical networks.
This operation. A system and method for converting an electrical signal to an optical signal for a fiber optic system. The electrical signal produced by a sensor (10) based upon a parameter being measured is connected across a material (12, 34, 40) that changes dimension responsive to an applied electrical signal.
An optical fiber (14, 30, 38) is coupled to the material (12, 34, 40) where dimension changes of. The electro-optic ef fect is one of several means to impose information on, or modulate a light wave carrier. Electro-optic devices have been developed for application in communications,1 – 4 analog and digital signal processing, 5 information processing6 optical computing, 6, 7 and sensing.
5, 7 Example devices include phase and amplitude. The dual parallel MZM could be implemented as in the above snapshot. Instead of driving the two middle vertical ports in the screenshot you could just force a 0 electrical signal there.
You would then remove the phase shift component (the X coupler introduces a pi/2 phase shift on its own) or you could use a powor combiner. We present an equivalent circuit model for a silicon carrier-depletion single-drive push–pull Mach–Zehnder modulator (MZM) with its traveling wave electrode made of coplanar strip lines.
In particular, the partial-capacitance technique and conformal mapping are used to derive the capacitance associated with each layer.
The PN junction is accurately modeled with the fringe capacitances.Keywords: duobinary, dual arm Mach Zehnder Modulator (dual arm MZM, single arm Mach Zender Modulator (single arm MZM). 1. Introduction In recent years, the demand for faster communication due to the explosive growth in internet activities has lead to the better usage of channel bandwidth.
Thus, Optical fiber.signals and for large values of the chirp parameters. Theoretical results are in good agreement with the simulation. 1 Introduction The Dual-Electrode Mach-Zehnder Modulator (DE-MZM) is an external electro-optic modulator that is widely used in Radio over Fiber (RoF) systems to .