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.

Suppression of polarization hole burning with an acousto-optic modulator

Abstract: An apparatus and method for reducing polarization hole burning in a rare-earth-doped fiber amplifier within an optical communication system by converting an optical carrier having a characteristic wavelength into a polarization-rotating optical carrier is disclosed. The apparatus includes a polarization-fixing device optically coupled in the optical transmission system to transform the optical carrier to a polarized optical carrier, and an acousto-optic modulator positioned to receive a first portion of the polarized optical carrier and to orthogonally convert the polarization of the polarized optical carrier and to shift the polarized optical carrier by a modulation frequency. The apparatus and method further includes a polarization beam combiner optically coupled to receive the orthogonally polarization converted and frequency shifted polarized signal and a portion of the original polarized optical carrier. The polarization beam combiner produces a polarization-rotating carrier signal that is transmitted downstream in the optical communication system to a rare-earth-doped fiber amplifier.

Microwave photonic direct-sequence transmitter and heterodyne correlation receiver

Abstract: This paper proposes and demonstrates a new architecture for the transmission, heterodyne reception, and correlation of direct-sequence (DS) signals encoded onto an optical carrier. The approach is practical for pseudo-noise in-modulated laser radar and free-space optical-code-division multiple-access communications. Although the local oscillator is free running, we show that the received signal is free from laser phase noise. Furthermore, by applying DS coding to both the transmitted signal and the local oscillator, the delay required for correlation can be realized via a combination of electrical and optical means.

Dual frequency optical carrier technique for transmission of reference frequencies in dispersive media

Abstract: Two different carrier frequencies modulated by a reference frequency are transmitted to each receiver to be synchronized therewith Each receiver responds to local phase differences between the two received signals to correct the phase of one of them so as to maintain the corrected signal as a reliable synchronization reference

Apparatus, system and method for optical packet switching using frequency header

Abstract: In the present invention, a single-frequency tone is used as addressing header for each optical packet (26). The frequency of the single-frequency tone is situated within the baseband of the digital payload signal and is preferably a radio-frequency tone. The single-frequency tone is multiplexed with teh digital payload and modulated into an envelope of an optical carrier. The frequency is indicative of an address or out-port (34, 36) for the optical packet (26), which means that different destinations in the network correspond to different frequencies. When switching such an optical packet, the power of the frequency tone (fj, fk) is measured. If a tone is present, the optical path corresponding to the allocation is opened by an electronic switch control (46), and when the tone disappears, the path is closed. Due to the narrow bandwith of the frequency tone, any disturbance of the digital payload is essentially negligible.