OPTICAL TRANSMITTING MODULE Russian patent published in 2005 - IPC

FIELD: quantum electronics; space laser communication systems and atmospheric laser communication systems.

SUBSTANCE: proposed optical transmitting system has external case accommodating fastening means, compound, laser diode installed in wiring wafer, and optical components which are optically coupled with active pad of laser diode, focus of optical components being on optical axis of transmitting module. Fastening means is made in the form of hollow cylindrical case attached by means of flexible compound to inner space of module case. Compound is introduced in gap between walls of external and internal cases through holes made in two sectional areas symmetrically over perimeter of external case; in addition, flexible compound forms azimuthally symmetric flexible components disposed in two sectional areas at edges of internal case outer surface. Laser diode is installed closer to one of internal case ends on side of optical components and is connected to electronic control unit, maximal permissible focal mismatch Δd being found from relationship between cases and flexible components depending on characteristics of materials: where L is distance between median sections of flexible components; F is focal length of optical components; C is distance between median sections of flexible component close to laser diode and radiation point of the latter; K₁ is stiffness coefficient of flexible component in section close to laser diode; K₂ is stiffness coefficient of flexible component in section distant from laser diode; α₁ is coefficient of linear temperature expansion of internal case material; β is coefficient of focal distance variation of optical components due to temperature; ΔT is ambient temperature variation range.

EFFECT: enhanced stability of directivity pattern of optical transmitting module due to reduced focal mismatch down to zero under impact of adverse mechanical and environmental factors.

1 cl, 3 dwg