Topic
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.
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TL;DR: Using a dual-electrode Mach-Zehnder modulator, a "tandem" single sideband modulator was constructed that doubled the spectral efficiency of a system by enabling the transmission of different data streams in the upper and lower sidebands of the same optical carrier as mentioned in this paper.
Abstract: Using a dual-electrode Mach-Zehnder modulator, a 'tandem' single sideband modulator has been constructed that doubles the spectral efficiency of a system by enabling the transmission of different data streams in the upper and lower sidebands of the same optical carrier.
38 citations
Patent•
21 Feb 1997
TL;DR: In this paper, mixing and modulating methods are described for nonlinear optical amplifiers which can generate intermodulation products of radiofrequency signals in an optical carrier signal without the penalty of an optical conversion loss and without the need for radiofrequency mixers, electro-optic modulators and expensive polarization-maintaining optical fibers.
Abstract: Mixing and modulating methods are described for nonlinear optical amplifiers (30) which can generate intermodulation products of radio-frequency signals in an optical carrier signal (26) without the penalty of an optical conversion loss and without the need for radio-frequency mixers, electro-optic modulators and expensive polarization-maintaining optical fibers. The radio-frequency signals can be applied to either a bias port (36) or an optical input port (32) of the optical amplifier and are used to upconvert and downconvert signals in phased-array antenna and remote antenna embodiments of the invention.
38 citations
20 Oct 2018
TL;DR: An optical technique for carrier recovery is established, harnessing large-gain stimulated Brillouin scattering on a photonic chip for up to 116.82 Gbit·s−1 self-CO-OFDM signals, and chip-based SBS-self-coherent technology reveals comparable performance to state-of-the-art coherent optical receivers while relaxing the requirements of the DSP.
Abstract: Modern fiber-optic coherent communications employ advanced, spectrally efficient modulation formats that require sophisticated narrow-linewidth local oscillators (LOs) and complex digital signal processing (DSP). Self-coherent optical orthogonal frequency-division multiplexing (self-CO-OFDM) is a modern technology that retrieves the frequency and phase information from the extracted carrier without employing a LO or additional DSP. However, a wide carrier guard is typically required to easily filter out the optical carrier at the receiver, thus discarding many OFDM middle subcarriers that limit the system data rate. Here, we establish an optical technique for carrier recovery, harnessing large-gain stimulated Brillouin scattering (SBS) on a photonic chip for up to 116.82 Gbit·s−1 self-CO-OFDM signals, without requiring a separate LO. The narrow SBS linewidth allows for a record-breaking small carrier guard band of ∼265 MHz in self-CO-OFDM, resulting in higher capacity than benchmark self-coherent multi-carrier schemes. Chip-based SBS-self-coherent technology reveals comparable performance to state-of-the-art coherent optical receivers while relaxing the requirements of the DSP. In contrast to on-fiber SBS processing, our solution provides phase and polarization stability. Our demonstration develops a low-noise and frequency-tracking filter that synchronously regenerates a low-power narrowband optical tone, which could relax the requirements on very-high-order modulation signaling for future communication networks. The proposed hybrid carrier filtering-and-regeneration technique could be useful in long-baseline interferometry for precision optical timing or reconstructing a reference tone for quantum-state measurements.
38 citations
Patent•
27 Feb 1992TL;DR: In this paper, the amplitude modulated television channel signals frequency modulates an optical communication path and the optical frequency of an optical carrier is FM modulated by the block of AM signals, which is performed by a pair of voltage controlled oscillators coupled in a push-pull mode of operation.
Abstract: A block of amplitude modulated television channel signals frequency modulates an optical communication path. In one embodiment, the AM modulated channel signals FM modulate an RF subcarrier which, in turn, is used to intensity modulate an optical carrier for transmission. Frequency modulation of the RF subcarrier by the amplitude modulated channel signals is advantageously performed at microwave frequencies. The FM modulated subcarrier signal is then converted down to a frequency range compatible with transmitter and receiver components used in the system. The frequency modulation and conversion can be performed by a pair of voltage controlled oscillators coupled in a push-pull mode of operation. The outputs of the oscillators are combined in a double balanced mixer to down convert the FM signal spectrum. In another embodiment, the optical frequency of an optical carrier is FM modulated by the block of AM signals. Receivers for the FM modulated band of AM channel signals are also disclosed.
37 citations
TL;DR: In this paper, an ultra-wideband spectrum analyzer that takes advantage of the broad spectral response and fine spectral resolution of spatial-spectral (S2) materials is presented.
37 citations