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Free space WDM signal detector

A detector and detector array technology, applied in free space transmission, satellite communication transmission, electrical components, etc., can solve the problem of difficult distance in free space

Inactive Publication Date: 2010-06-30
HEWLETT PACKARD DEV CO LP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the free-space distance between the transmitter and receiver often makes alignment more difficult

Method used

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  • Free space WDM signal detector
  • Free space WDM signal detector
  • Free space WDM signal detector

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Embodiment Construction

[0011] According to an aspect of the invention, a detector system for a free space wavelength division multiplexed (WDM) signal comprises an array or mosaic of different types of detectors. In order to provide tolerance to static and dynamic misalignment, the array can be made relatively large relative to the WDM signal beam profile (profile), so that even if the misalignment between the center of the detector and the WDM signal beam is larger than the beam width, the beam will also be incident on the active area of ​​the array. Different types of detectors in the array are capable of detecting different frequency components of the WDM signal beam. The detectors can be made small relative to the WDM signal beam profile and arranged in the array such that regardless of where the WDM signal is incident on the array, at least one detector of each type will receive to the light from the WDM signal beam.

[0012] The detector system according to the invention can be used for comm...

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Abstract

A system (100) can include a transmitter (114) that produces an optical signal (118) having a plurality of carrier frequencies and a receiver (116) separated from the transmitter (114) by free space through which the optical signal (118) propagates. The receiver (116) includes an array (200) of detectors of multiple types, with the types being capable of detecting light respectively having the carrier frequencies. A location of an incident area (220) where the optical signal (118) is incident on the detector array (200) generally depends on a misalignment of the receiver (116) relative to the transmitter (114) , but the detectors in the detector array (200) are arranged so that at least one detector of each of the types detects light from the optical signal (118) regardless of where the incident area (220) is on the detector array (200).

Description

Background technique [0001] Systems employing wavelength-division multiplexing (WDM) optical signals are able to split data into multiple data channels and encode each data channel on a monochromatic optical carrier beam with a different frequency. These monochromatic beams can then be combined into a single beam to form a WDM signal that can be transmitted through a single optical system, for example on the same optical fiber. Using multiple optical carrier frequencies to transmit data thus doubles the data transmission bandwidth of the optical system compared to a system using the same data encoding technique on a monochromatic beam. [0002] Receivers of WDM signals typically use the difference in carrier frequency to isolate or separate the individual frequency components. The individual signals can then be decoded to extract the received data. Typically, such decoding employs a photodiode or similar photodetector that generates an electrical signal corresponding to the ...

Claims

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Application Information

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IPC IPC(8): G02B6/28H04B10/118
CPCH04B10/1121
Inventor R·博索莱尔W·吴D·法塔尔M·菲奥伦蒂诺
Owner HEWLETT PACKARD DEV CO LP