direct modulation


Also found in: Acronyms.

direct modulation

In optical networking, generating the modulated signal by varying the current that creates the laser emission. Direct modulation is used for transmission speeds up to 2.5 GHz or higher speeds for short distances. Contrast with external modulation.
References in periodicals archive ?
We have also discovered that direct modulation the neurons underlying this lateral interaction, the horizontal cells, improves quality of vision in mice lacking functional cones.
Among their topics are digital signal processing for optical coherent long-haul transmission, digital signal processing for direct-detection orthogonal frequency direct modulation systems, digital signal processing for dual/quad subcarrier orthogonal frequency direct modulation coherent detection, digital signal processing implementation in orthogonal frequency direct modulation signal systems, and digital signal processing for photonic vector signal generation.
As compared to the direct modulation technique using single VCSEL, a considerably improved transmission performance is achieved through the proposed optical I/Q modulation.
Dry--etched short--cavity ridge waveguide MQW lasers suitable for monolithic integration with direct modulation bandwidth upto 3 GHz and low drive currents.
Optical light sources with direct modulation (irrespectively on source type) were more tolerable for in-band crosstalk penalty compared with an externally modulated DFB-LD source [11].
White, "35-GHz intrinsic bandwidth for direct modulation in 1.3-[micro]m semiconductor lasers subject to strong injection locking," IEEE Photonics Technology Letters, vol.
These include antioxidant and anti-inflammatory properties as well as direct modulation of signalling pathways relevant for neurodegeneration.
The direct modulation scheme is simple but suffers from a laser--frequency chirp effect, this chirp effect results in severe degradation of the RoF system performance.
Direct modulation with low distortion plus low group delay result in a low bit-error rate (BER) for enhanced system integrity and reliability.
The IP also provides carrier and image suppression when used with direct modulation schemes.
Sumitomo Electric Industries Ltd, a leader in optical solutions, has announced that it is expanding its 10 Gbps portfolio with the introduction of an integrated direct modulation laser diode (DML) and a built-in electronic dispersion compensation (EDC) feature for use in 80 km transceivers.
This article focuses on a special phase-locked loop (PLL) module used in a W-CDMA mobile terminal with an RF direct modulation transmitter and a superheterodyne receiver.

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