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.

Acousto-optic comparison switch for optical switching networks with analog addressing techniques

Abstract: Sorting networks based on perfect-shuffle or Banyan interconnection techniques are useful in parallel processing and telecommunications applications. An acousto-optic comparison switch that is useful in such networks is implemented, which ensures high-bandwidth optical data transmission by multiplexing the data and the address on orthogonal polarizations of light. Addresses are encoded either as the frequencies of amplitude modulation of the optical carrier or as discrete optical power levels, and are compared by using simple analog techniques. An analysis of both address techniques with respect to speed and noise is crucial to estimating the switch performance.

Centralized-Light-Source Two-Way PAM8/PAM4 FSO Communications With Parallel Optical Injection Locking Operation

Abstract: For the first time up to our knowledge, a centralized-light-source two-way eight-level pulse amplitude modulation (PAM8)/four-level pulse amplitude modulation (PAM4) free-space optical (FSO) communication with parallel optical injection-locked vertical-cavity surface-emitting laser (VCSEL) transmitter is practically demonstrated. With the assistance of parallel optical injection locking, injection locking in the polarization sideband causes a simultaneous generation of the free-running orthogonal polarization sideband to form a centralized-light-source scheme. With the centralized light source, additional light source or wavelength reuse component, such as Fabry-Perot laser diode or reflective semiconductor optical amplifier, is not needed at the receiver side. It is very attractive because it enables the receiver side to share the light source remotely located at the transmitter side. Based on the centralized-light-source scheme and parallel optical injection-locking operation, the injection-locked parallel polarization sideband is used for downlink transmission, and the induced free-running orthogonal polarization sideband is transmitted and used as the optical carrier for uplink transmission. Over a 200-m free-space link, good bit-error-rate (BER) performance, the qualified PAM8, and PAM4 eye diagrams are obtained for two-way FSO communications. This proposed centralized-light-source two-way FSO communication provides a practical choice for two-way high transmission capacities and considerably develops the scenario characterized by parallel optical injection locking.

Systems and methods for full duplex coherent optics

Abstract: A full duplex communication network includes an optical transmitter end having a first coherent optics transceiver, an optical receiver end having a second coherent optics transceiver, and an optical transport medium operably coupling the first coherent optics transceiver to the second coherent optics transceiver. The first coherent optics transceiver is configured to simultaneously transmit a downstream optical signal and receive an upstream optical signal. The second coherent optics transceiver is configured to simultaneously receive the downstream optical signal from the first coherent optics transceiver and transmit the upstream optical signal first coherent optics transceiver. At least one of the downstream optical signal and the upstream optical signal includes at least one coherent optical carrier and at least one non-coherent optical carrier.

Data transmission devices for communication facilities of a passive optical network

Abstract: A passive optical network comprises at least one communication facility, termed network head, coupled to at least two communication facilities, termed remote, by transmission and routing means. The network head is charged with transmitting to the remote facilities an alternation of a first portion of an optical carrier, modulated by data to be transmitted according to a chosen bit rate and lasting a first time interval, and of a second portion of this optical carrier, modulated by a clock signal at a base frequency corresponding to the bit rate and lasting a second time interval. Each remote facility is charged, on the one hand, with recovering the base frequency in the first and second received portions, and, on the other hand, with transmitting to the network head, during chosen time slots synchronized by the network head, the part which corresponds to these time slots in some at least of the second portions received successively after having overmodulated with data to be transmitted the clock signal that it contains.

Gigabits in the home with plugless plastic optical fiber (POF) interconnects

Abstract: We have developed plugless optical transceivers for low cost optical networking with plastic optical fiber (POF). The transmission speed is 125 Mb/s for Ethernet applications and 1.25 Gb/s for Gigabit Ethernet and other high speed applications. The high speed modules for Gigabit transmission are based on a red VCSEL light source for the transmitter that matches the optical attenuation minimum of the plastic fiber media. The devices have demonstrated excellent reliability with more than 850,000 hours of mean-time-to-failure operating life time at elevated temperatures of 40degC. Automotive qualified, rugged resonant cavity LEDs (RCLEDs) are used for the lower speed modules. The plugless transceiver design enables the direct optical connection between the active components and standard POF without the need for special termination of the fiber. Only a simple cutting action is required. This enables low cost field installations.