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Monolithic integrated orthogonal balanced light detector

A technology of optical detectors and monolithic integration, applied in the field of coherent detection, can solve the problems of high cost, large volume, unfavorable integration, etc.

Active Publication Date: 2012-06-27
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

figure 1 It is a common quadrature balanced optical receiver, which consists of a 90° optical hybrid and two double-balanced optical detectors. Both the optical hybrid and the double-balanced detector are composed of discrete devices, which have the characteristics of large volume and high cost.
Moreover, this balanced optical receiver requires the use of a birefringent crystal polarization beam splitter, and the detector is usually based on III-V or IV materials, which is particularly unfavorable for integration

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  • Monolithic integrated orthogonal balanced light detector
  • Monolithic integrated orthogonal balanced light detector
  • Monolithic integrated orthogonal balanced light detector

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Embodiment Construction

[0049] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further elaborated below in combination with specific examples and with reference to the accompanying drawings.

[0050] figure 1 It is a schematic diagram of an existing quadrature balanced receiver, which consists of a 90° optical mixer and two double-balanced photodetectors. Both the optical mixer and the double-balanced detector are composed of discrete devices, which have the characteristics of large volume and high cost. . This balanced optical receiver requires the use of birefringent crystal polarizing beam splitters, and detectors are usually based on III-V or IV materials, which is particularly unfavorable for integration.

[0051] The monolithically integrated orthogonally balanced optical detector proposed in the present invention integrates two double-balanced orthogonally polarized optical detectors and their bias circuits, which ...

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Abstract

The invention provides a monolithic integrated orthogonal balanced light detector, which comprises two double-balanced polarization light detectors and a biasing circuit of the double-balanced polarization light detectors, wherein the double-balanced polarization light detectors can be used for detecting transverse electric (TE) and transverse magnetic (TM) polarized light. The orthogonal balanced light detector can be used as a core device of an orthogonal balanced receiver for detecting differential phase shift keying (QPSK) / differential quadrature phase shift keying (DQPS) signals. The biasing circuit comprising an on-chip capacitor, a high-frequency current suppressing resistor and a load resistor is also integrated in the device. The detector has light signal polarization selectivity, so a polarizing beam splitting mirror is not needed, the size of a light receiver can be greatly reduced, the work speed of the device is accelerated, and the reliability of the device is improved.

Description

technical field [0001] The invention relates to the field of coherent detection, in particular to a single-chip integrated orthogonal balanced light detector, which includes two double balanced polarized light detectors capable of detecting TE and TM polarizations. The monolithic integrated quadrature balanced optical detector can be used as a core device of a quadrature balanced receiver to detect QPSK / DQPSK signals. Background technique [0002] The current receiving system of optical communication is divided into two categories: one is intensity modulation / direct detection (IM / DD); the other is coherent detection. Compared with IM / DD, coherent detection has higher detection sensitivity, smaller transceiver antenna aperture, lower power consumption, stronger anti-interference ability and higher speed. Therefore, coherent detection has become an important technical approach to develop a new generation of high bit rate, miniaturized and low power consumption space laser com...

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Application Information

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IPC IPC(8): G01J1/42
Inventor 程远兵伍剑姚辰林金桐
Owner BEIJING UNIV OF POSTS & TELECOMM
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