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Method and apparatus for control of DPSK and DQPSK receivers and transmitters

A transmitter and receiver technology, applied in electromagnetic receivers, instruments, electrical components, etc., to solve complex transmitter and receiver problems

Active Publication Date: 2015-09-02
朗美通光学公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] DPSK and DQPSK modulation formats require fairly complex transmitters and receivers

Method used

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  • Method and apparatus for control of DPSK and DQPSK receivers and transmitters
  • Method and apparatus for control of DPSK and DQPSK receivers and transmitters
  • Method and apparatus for control of DPSK and DQPSK receivers and transmitters

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Embodiment Construction

[0053] This application is by reference to US Provisional Application No. 60 / 710749, filed August 24, 2005.

[0054] Referring now to FIG. 4, a diagram of an optical transmitter having a pulse modulator 36 and a data modulator 38 is shown. Optical feedback signal 39 provides control information to modulator controller 42 . Modulator controller 42 provides three control signals for generating the modulated optical signal. Pulse bias control signal 44 provides bias control to pulse modulator 36 , data bias control signal 46 provides bias control to data modulator 38 and phase control signal 48 provides phase control for phase shifter 50 .

[0055] Typically, modulator controller 42 monitors the output optical power in optical feedback 39 and maintains desired values ​​for data bias signal 46 , pulse bias signal 44 , and phase control signal 48 . Modulator controller 42 uses a series of high frequency dithers to set bias signals 44 and 46 and phase control signal 48 to produce ...

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PUM

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Abstract

An optical communication device such as a transmitter or receiver has a control loop for controlling relative phase of two related optical signals based on signal peak intensity. An optical transmitter measures the signal peak intensity of a combined optical signal representing two data channels to adjust relative phase as desired. An optical receiver measures the signal peak intensity of combined electrical signals, single electrical signals or single optical signals to adjust relative phase as desired. Signal peak intensity is minimized or maximized by adjusting the relative phase, depending upon the modulation configuration used. The feedback control provides a consistent and robust control to stabilize the optical communication device in the presence of variables such as temperature changes, aging and manufacturing tolerances.

Description

[0001] This application is a divisional application of the invention patent application with the application date of August 24, 2006, the title is "Method and Device for Controlling DPSK and DQPSK Receivers and Transmitters", and the application number is 200680039554.6. technical field [0002] Cross References to Related Applications [0003] This application claims the benefit of US Provisional Application No. 60 / 710749, filed August 24,2005. [0004] Statement Regarding Federally Sponsored Research or Development [0005] (Not applicable) Background technique [0006] Differential Phase Shift Keying (DPSK, also known as Differential Binary Phase Shift Keying DBPSK) and Differential Quadrature Phase Shift Keying (DQPSK) are very attractive modulation formats for optical data transmission. When used with a balanced direct detection receiver, DPSK is about 3dB more sensitive than a conventional on-off keying receiver. Dense Wavelength Division Multiplexing (DWDM) transmi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/556H04B10/67
CPCH04B10/677G02F1/0123H04B10/5053G02F1/2255H04B10/50575H04B10/50577H04B10/5051H04B10/5561
Inventor P·马梅舍夫
Owner 朗美通光学公司
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