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: In this paper, a novel approach to realizing single sideband (SSB) modulation with optical carrier to sideband ratio (OCSR) of 0 dB, which is optimum for maximizing the transmission performance of a radio-over-fiber system, is proposed and experimentally demonstrated based on a strong optical injection-locked distributed feedback (DFB) laser.
Abstract: A novel approach to realizing single sideband (SSB) modulation with optical carrier to sideband ratio (OCSR) of 0 dB, which is optimum for maximizing the transmission performance of a radio-over-fiber system, is proposed and experimentally demonstrated based on a strong optical injection-locked distributed feedback (DFB) laser. Tunable OCSR with optimum value of 0 dB is achieved by tuning the injection ratio and the detuning frequency precisely. A simulation is carried out to confirm the optimum OCSR. Gain properties of the DFB laser under strong optical injection are also measured for the first time to our knowledge. Doubled frequency of the LO signal is obtained without any filter. The generated optical SSB signal of 20 GHz is transmitted over 60-km single-mode fiber experimentally; results show it is almost not affected by the fiber chromatic dispersion.
18 citations
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15 Jan 1990
TL;DR: In this paper, an integrated optical switch (6) receives at an input a linearly-polarized optical carrier and transferring same to a first or a second output (P3, P4), according to the logic values of the bits of a modulating binary data signal.
Abstract: The modulator comprises an integrated optical switch (6) receiving at an input a linearly-polarized optical carrier and transferring same to a first or a second output (P3, P4), according to the logic values of the bits of a modulating binary data signal. The radiations outgoing from the switch are sent to a polarizing beam splitter (13) with their original polarization or with a polarization rotated by 90° depending on the switch output (P3, P4) from which they come. A signal with the original polarization or with the polarization rotated by 90° is present at the splitter output, depending on the logic values of the bits of the modulating signal.
17 citations
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TL;DR: In this paper, a microwave frequency measurement system utilizing the optical injection technology in a semiconductor laser is proposed, where a single-wavelength optical carrier is generated and divided into two parts.
Abstract: A microwave frequency measurement system utilizing the optical injection technology in a semiconductor laser is proposed. A single-wavelength optical carrier is generated and divided into two parts. One part is intensity-modulated by a control signal with a triangular shape and then injected into a semiconductor laser to generate a frequency scanning optical sideband. The other part is modulated by the microwave signal under test, which is then coupled with the frequency scanning optical sideband and detected by a photodetector (PD). The output of the PD is filtered by an electrical passband filter and detected by an envelope detector. Electrical pulses will be obtained with the time interval proportional to the microwave frequency. Thus the microwave frequency can be retrieved from the time interval of the generated pulses. A proof of concept experiment is taken. The microwave frequency measurement from 3 to 40 GHz is achieved, and the frequency measurement errors are within ±30 MHz.
17 citations
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TL;DR: In this paper, a theoretical analysis reveals that perfect carrier suppression can be achieved at a specific modulation strength, which depends on the gain and intensity ratio between the two beams, and achieves a maximum of -729±24dB carrier suppression at the theoretically ideal modulation strength.
Abstract: Suppression of an optical carrier from an RF modulated laser beam of wavelength 532 nm is performed using two-beam coupling in photorefractive barium titanate A theoretical analysis reveals that perfect suppression can be achieved at a specific modulation strength, which depends on the gain and intensity ratio between the two beams The experiments achieve a maximum of -729±24 dB carrier suppression at the theoretically ideal modulation strength, and -610±24 dB for small modulation strengths
17 citations
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18 Jun 1986TL;DR: In this article, the authors proposed a differential-polarization detection method to detect long-term changes in the polarization of an optical carrier by comparing relative polarization between successive clock periods.
Abstract: Digital information is modulated onto an optical carrier using differential-polarization encoding, passed through a transmission medium which may produce unpredictable long-term changes in polarization and then demodulated using differential-polarization detection techniques (e.g., by comparing relative polarization between successive clock periods). Other modulated carrier parameters may be used to simultaneously carry further information. Special polarization modulation and detection techniques are also disclosed.
17 citations