Topic
Extinction ratio
About: Extinction ratio is a research topic. Over the lifetime, 8541 publications have been published within this topic receiving 111908 citations.
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TL;DR: A compact broadband polarization beam splitter using a symmetric directional coupler with sinusoidal bends on a silicon-on-insulator platform to suppress the power exchange between two parallel symmetric strip waveguides for the transverse-electric (TE) mode, while allowing for the maximum power transfer to the adjacent waveguide for thetransverse-magnetic (TM) mode.
Abstract: We design and demonstrate a compact broadband polarization beam splitter (PBS) using a symmetric directional coupler with sinusoidal bends on a silicon-on-insulator platform. The sinusoidal bends in our PBS suppress the power exchange between two parallel symmetric strip waveguides for the transverse-electric (TE) mode, while allowing for the maximum power transfer to the adjacent waveguide for the transverse-magnetic (TM) mode. Our PBS has a nominal coupler length of 8.55 μm, and it has an average extinction ratio (ER) of 12.0 dB for the TE mode, an average ER of 20.1 dB for the TM mode, an average polarization isolation (PI) of 20.6 dB for the through port, and an average PI of 11.5 dB for the cross port, all over a bandwidth of 100 nm.
40 citations
Patent•
14 Apr 1995TL;DR: In this paper, a locking apparatus for an optical frequency multiplex system was proposed, including a local oscillating unit for applying low frequency signals to individual light sources and thereby making center frequencies of the light sources dither.
Abstract: A locking apparatus for an optical frequency multiplex system, including a local oscillating unit for applying low frequency signals to individual light sources and thereby making center frequencies of the light sources dither, photocouplers for grouping dithering optical signals outputted from the light sources into a single signal, a resonator for aligning the signals coupled by the photocouplers with optical frequency slots, respectively, a photodetector for converting a reflection optical signal from the photocouplers into a current signal, and an optical frequency stabilizing controller for controlling the light sources on the basis of an error signal detected by the photodetector, whereby the error signal is extracted using the reflection output rather than the transmitting output of the resonator, thereby being capable of enhancing the extinction ratio and maximizing the number of multiplexing light sources.
40 citations
Patent•
22 Aug 1989TL;DR: A ferrule for optical fibers transmitting linearly polarized light capable of preventing deterioration and fluctuation of the extinction ratio was proposed in this article, where at least two paths connecting a region in a vicinity of an end of a puncture for an optical fiber inside the flange portion with outside of the ferrule were introduced.
Abstract: A ferrule for optical fibers transmitting linearly polarized light capable of preventing deterioration and fluctuation of the extinction ratio. The ferrule incorporates at least two paths connecting a region in a vicinity of an end of a puncture for an optical fiber inside the flange portion with outside of the ferrule. These paths effectively enable the removal of air in such a region which could have caused an extraneous stress on the optical fiber resulting in deterioration of the extinction ratio. An optical fiber connector using this ferrule is also disclosed.
40 citations
TL;DR: In this article, a diode-pumped Q-switched Ti:Er:LiNbO/sub 3/ waveguide laser was developed with a monolithically integrated folded Mach-Zehnder type modulator of high extinction ratio as the Q-switch.
Abstract: Diode-pumped Q-switched Ti:Er:LiNbO/sub 3/ waveguide lasers have been developed with a monolithically integrated folded Mach-Zehnder type modulator of high extinction ratio as the Q-switch. The lasers are operated at 1562 nm wavelength, emitting pulses of 4.3 ns halfwidth with up to 1.44 kW peak power at 1 kHz repetition frequency. Good agreement between experimental and theoretical results has been obtained.
40 citations
TL;DR: In this article, a theoretical model describing the characteristics of the SOA-based intensity modulators is developed, based on which optimum SOA operating conditions are identified, and it is shown that the optimized SOAs-based intensifiers support a 30 Gb/s AMOOFDM signal transmission over a 80 km SMF, which doubles the transmission performance offered by directly modulated DFB lasers.
Abstract: Detailed numerical investigations of the transmission performance of adaptively modulated optical orthogonal frequency division multiplexed (AMOOFDM) signals are undertaken, for the first time, in optical amplification- and chromatic dispersion compensation-free SMF IMDD systems using semiconductor optical amplifiers (SOAs) as intensity modulators. A theoretical model describing the characteristics of the SOA-based intensity modulators is developed, based on which optimum SOA operating conditions are identified. It is shown that the optimized SOA-based intensity modulators support a 30 Gb/s AMOOFDM signal transmission over a 80 km SMF, which doubles the transmission performance offered by directly modulated DFB lasers. The aforementioned performance enhancement is mainly due to a considerable reduction in the frequency chirp effect, resulting from the strong SOA gain saturation-induced decrease in SOA effective carrier lifetime. Relatively low extinction ratio and clipping of the SOA modulated signals are identified to be the key factors limiting the maximum achievable AMOOFDM transmission performance. In addition, results also indicate that both the optimum SOA operating conditions and the AMOOFDM transmission performance are insusceptible to variations in SOA parameters.
40 citations