Optical Carrier transmission rates

About: Optical Carrier transmission rates is a research topic. Over the lifetime, 2463 publications have been published within this topic receiving 33293 citations.

Accurate optical vector network analyzer based on optical single-sideband modulation and balanced photodetection

Abstract: A novel optical vector network analyzer (OVNA) based on optical single-sideband (OSSB) modulation and balanced photodetection is proposed and experimentally demonstrated, which can eliminate the measurement error induced by the high-order sidebands in the OSSB signal. According to the analytical model of the conventional OSSB-based OVNA, if the optical carrier in the OSSB signal is fully suppressed, the measurement result is exactly the high-order-sideband-induced measurement error. By splitting the OSSB signal after the optical device-under-test (ODUT) into two paths, removing the optical carrier in one path, and then detecting the two signals in the two paths using a balanced photodetector (BPD), high-order-sideband-induced measurement error can be ideally eliminated. As a result, accurate responses of the ODUT can be achieved without complex post-signal processing. A proof-of-concept experiment is carried out. The magnitude and phase responses of a fiber Bragg grating (FBG) measured by the proposed OVNA with different modulation indices are superimposed, showing that the high-order-sideband-induced measurement error is effectively removed.

Bus rate adaptation and time slot assignment circuit for a sonet multiplex system

Abstract: An interface device is provided which may be used to perform rate adaptation and time slot assignment, in either the transmit or receive directions, in a multiplexing unit for interfacing a high rate optical carrier line to a plurality of lower rate information carrier lines. The high rate optical carrier line may be a SONET or SDH carrier line. The interface device according to the present invention may be operationally configured to provide data rate adaptation and time slot assignment between an optical carrier line operating at an OC-12 rate with lower rate lines operating according to OC-3, OC-1, DS-3, or DS-1 protocols, or even virtual channels. A plurality of identical interface devices may be cascaded together and used to perform interface support for various channels operating at various rates, merely by manipulating the operational configuration of the individual interface devices in the cascade.

Optical carrier-based microwave interferometers for sensing application

Abstract: Optical fiber interferometers (OFIs) have been extensively utilized for precise measurements of various physical/chemical quantities (e.g., temperature, strain, pressure, rotation, refractive index, etc.). However, the random change of polarization states along the optical fibers and the strong dependence on the materials and geometries of the optical waveguides are problematic for acquiring high quality interference signal. Meanwhile, difficulty in multiplexing has always been a bottleneck on the application scopes of OFIs. Here, we present a sensing concept of optical carrier based microwave interferometry (OCMI) by reading optical interferometric sensors in microwave domain. It combines the advantages from both optics and microwave. The low oscillation frequency of the microwave can hardly distinguish the optical differences from both modal and polarization dispersion making it insensitive to the optical waveguides/materials. The phase information of the microwave can be unambiguitly resolved so that it has potential in fully distributed sensing. The OCMI concept has been implemented in different types of interferometers (i.e., Michelson, Mach-Zehnder, Fabry-Perot) among different optical waveguides (i.e., singlemode, multimode, and sapphire fibers) with excellent signal-to-noise ratio (SNR) and low polarization dependence. A spatially continuous distributed strain sensing has been demonstrated.

Hybrid Fiber-Optic Radio Frequency and Optical Frequency Dissemination With a Single Optical Actuator and Dual-Optical Phase Stabilization

Abstract: In this paper, we propose and experimentally demonstrate a technique for simultaneous dissemination of optical and radio frequencies (RF) over an optical-fiber link with a single optical actuator and dual-optical phase stabilization. The optical actuator, namely electro-optic modulator (EOM), can simultaneously be served with a coupler and a dual optical frequency shifter to couple an RF frequency and an optical frequency and to efficiently suppress the phase noise of the two optical frequencies introduced by the fiber link with dual-optical phase stabilization, respectively. We experimentally demonstrate 193 THz optical carrier dissemination with a stability of $1.2\times 10^{-15}$ at the integration time of 1 s and $3.5\times 10^{-17}$ at 10,000 s, and 0.9 GHz RF frequency dissemination with a stability of $5.7\times 10^{-13}$ at 1 s and $5.2\times 10^{-16}$ at 10,000 s over a 30 km optical fiber link in a single telecommunication channel. This proof-of-principle experiment is particularly useful for users who need both RF and optical frequencies simultaneously, but do not have cumbersome and expensive optical combs, and also provides a promising solution towards a robust and flexible ultrastable optical frequency network for multi-user dissemination based on a frequency division multiplexing technique.

Ultra-Wideband Low-Noise Amplifier andSix-Port Transceiver for High Speed DataTransmission

Abstract: Today’s data rates in wired networks can reach 100 Gbit/s using optical fiber while data rates in wireless networks are much lower - tens of Mbit/s for 3G mobile communication and 480 Mbit/s for ul ...