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  • Volume 47, Issue 4
  • Volume 47, Issue 4

    A fiber circulator introduces a singlemode beam into an optical TTD device based on a tilted diffraction grating. The beam is reflected from a steering mirror to a collimating lens. Turning the mirror translates the collimated beam across the grating, changing the optical path length. The light is diffracted back along its path and back into the fiber circulator.
    Fiber Optics

    SIGNAL PROCESSING: Tilted grating produces true time delay for RF photonics

    April 1, 2011
    Microwave-photonic systems are frequently assisted by photonic devices operating at optical wavelengths. For example, true time-delay (TTD) lines, which are essential parts of...
    1304qa Chang New
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    Business Forum: How feasible is it to raise funds in the US from my current location?

    April 1, 2011
    It is very difficult to get venture funding in my country because there are only two VC firms and both are small and extremely risk averse. Is it possible to raise venture capital...
    FIGURE 1. A nanopositioning stage equipped with inferred-metrology piezoresistive sensors (PRSs; a) is compared to a more precise unit with direct-metrology capacitive feedback (b). In the latter, the stage platform is measured directly, greatly improving stability and position linearity and eliminating crosstalk errors.
    Positioning, Support & Accessories

    MOTION CONTROL: Nanopositioning technology shows progress on multiple levels

    March 21, 2011
    Nanometer resolution for motion-control devices is becoming increasingly necessary in many areas of photonics. Advances in piezo motion control are eliminating traditional tradeoffs...