Topic
Optical link
About: Optical link is a research topic. Over the lifetime, 3813 publications have been published within this topic receiving 39625 citations.
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TL;DR: In this paper, an optical-fiber-based non-degenerate PSA link consisting of a phase-insensitive parametric copier followed by a PSA that provides broadband amplification, signal modulation format independence, and nearly 6dB link noise-figure (NF) improvement over conventional, erbium-doped fiber amplifier based links.
Abstract: Optical phase-sensitive amplifiers (PSAs) are known to be capable, in principle, of realizing noiseless amplification and improving the signal-to-noise-ratio of optical links by 3 dB compared to conventional, phase-insensitively amplified links. However, current state-of-the-art PSAs are still far from being practical, lacking e.g. significant noise performance improvement, broadband gain and modulation-format transparency. Here we demonstrate experimentally, for the first time, an optical-fiber-based non-degenerate PSA link consisting of a phase-insensitive parametric copier followed by a PSA that provides broadband amplification, signal modulation-format independence, and nearly 6-dB link noise-figure (NF) improvement over conventional, erbium-doped fiber amplifier based links. The PSA has a record-low 1.1-dB NF, and can be extended to work with multiple wavelength channels with modest system complexity. This concept can also be realized in other materials with third-order nonlinearities, and is useful in any attenuation-limited optical link.
419 citations
TL;DR: In this article, the authors reported error free operation of a directly non-return-to-zero modulated 850-nm vertical cavity surface-emitting laser (VCSEL) link operating to 71 Gb/s.
Abstract: We report error free ( $\textrm {BER} ) operation of a directly non-return-to-zero modulated 850-nm vertical cavity surface-emitting laser (VCSEL) link operating to 71 Gb/s. This is the highest error free modulation rate for a directly modulated laser of any type. The optical link consists of a 130-nm BiCMOS driver IC with two-tap feed-forward equalization, a wide bandwidth 850-nm VCSEL, a surface illuminated GaAs PIN photodiode, and a 130-nm BiCMOS receiver IC.
307 citations
Patent•
11 Aug 2000
TL;DR: In this paper, the authors proposed a solution to decrease the number of times of transmission of a reset signal for a network which decides the topology of a bus in compliance with IEEE 1394 to a minimum number of transmissions in a communication network such as a LAN.
Abstract: PROBLEM TO BE SOLVED: To decrease the number of times of transmission of a reset signal for a network which decides the topology of a bus in compliance with, e.g. the IEEE 1394 to a minimum number of times in a communication network, such as a LAN. SOLUTION: An optical transmitter 1 (2, 11) is a device that optically transmits a twisted pair signal used for a network such as a LAN and a serial bus and consists mainly of a transceiver section 101 that sends/receives data to/from a terminal 100, a code conversion section 102, that encodes data received from the transceiver section 101 into optical transmission data, an optical transmission section 103 and an optical reception section 104 that send/receive data to/from other optical transmitter being a communication opposite party, and optical data detection section 105 that detects a level of a signal received by the optical reception section 104, a state notice section 106 that informs the terminal equipment 100 of the communication state, and an optical link generating section 107 that generates prescribed data, when the optical transmission is in shielded state.
291 citations
Patent•
20 Apr 1999TL;DR: Opto-electrical systems having electrical and optical interconnections formed in thin layers with thin-film active devices are disclosed in this article, where optical connections are made between the edge of one substrate and the surface of another substrate with the use of photorefractive materials.
Abstract: Opto-electrical systems having electrical and optical interconnections formed in thin layers with thin-film active devices are disclosed. In one embodiment, optical connections are made between the edge of one substrate and the surface of another substrate with the use of photorefractive materials. In another embodiment, the optical connection is made by separating a optical film from the first substrate and coupling the first substrate and the optical film to separate receptacles located on the second substrate. Film optical link modules employing aspects of the invention are also disclosed.
236 citations
TL;DR: The experimental results show that the power of the transmitted OAM mode will tend to spread uniformly onto the neighboring mode in medium-to-strong turbulence, resulting in severe crosstalk at the receiver, and the power penalty is found to exceed 10 dB in a weak- to-medium turbulence condition.
Abstract: We experimentally investigate the performance of an orbital angular momentum (OAM) multiplexed free space optical (FSO) communication link through emulated atmospheric turbulence. The turbulence effects on the crosstalk and system power penalty of the FSO link are characterized. The experimental results show that the power of the transmitted OAM mode will tend to spread uniformly onto the neighboring mode in medium-to-strong turbulence, resulting in severe crosstalk at the receiver. The power penalty is found to exceed 10 dB in a weak-to-medium turbulence condition due to the turbulence-induced crosstalk and power fluctuation of the received signal.
233 citations