Directly modulated optical differential phase keying modulator

A differential phase shift keying and modulator technology, applied in the field of optical communication, can solve the problems of inability to laser, high cost, integration, etc., and achieve the effects of mature technology, low cost of components, and easy integration

Inactive Publication Date: 2008-12-10
SHANGHAI JIAO TONG UNIV
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  • Abstract
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Problems solved by technology

External modulators are more expensive than direc

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  • Directly modulated optical differential phase keying modulator

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[0012] In order to better understand the technical solutions of the present invention, the embodiments are further described below in conjunction with the accompanying drawings.

[0013] figure 1 The structural diagram of the directly modulated optical differential phase shift keying modulator of the present invention is given. Its main functional modules (devices) include: high-speed electrical NAND logic gates, distributed feedback lasers, optical narrowband filters, prisms, photodetectors Detector, condenser, fiber pigtail; each module (device) is connected through a spatial optical path or circuit.

[0014] Such as figure 1 As shown, the data signal and the clock signal are synchronously input to the high-speed electrical NAND logic gate, the output of the high-speed electrical NAND logic gate is connected to the modulation drive end of the distributed feedback laser, and the high-speed electrical NAND logic gate outputs the anti-non-return-to-zero code electrical signal to M...

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Abstract

The invention relates to a light differential phase shift keying modulator of direct modulation, wherein a clock signal and a data signal are synchronously input to a high speed electrical and logic gate, which outputs a non-capturing electrical signal to demodulate the distributed feedback type laser, and the distributed feedback type laser works in the high offset position. The larger insulation chatter results in the frequency shift, a DC driving bias is properly adjusted, to drive the signal intensity and the filter characteristic of the filter, which causes the output signal of the narrow band filter to generate a large chatter on the position with lower power, wherein the chatter just generates pi-phase shift, thereby generating the light differential phase shift keying control signal. The invention saves the process of the differential code generated by the traditional differential phase shift keying control signal, which is low in cost, easy in integration, and fast in practicality.

Description

technical field [0001] The present invention relates to a directly modulated optical differential phase-shift keying modulator, in particular to a directly modulated optical based on high-speed electrical NAND logic gate, distributed feedback laser (Distribute feedback laser, DFB laser) and optical narrowband filter A differential phase-shift keying modulator generates an optical differential phase-shift keying signal by means of direct modulation, and belongs to the technical field of optical communication. Background technique [0002] The technology that changes the intensity or phase of light as the data signal changes is called light modulation technology. Optical modulation formats are divided into intensity modulation, phase modulation and frequency modulation. Common intensity modulation patterns include Non-Return-to-Zero (NRZ) and Return-to-Zero (RZ); common phase modulation patterns include Binary Phase Shift Keying (Binary Phase Shift Keying, BPSK), Differentia...

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Application Information

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IPC IPC(8): H04B10/18H04B10/12H04B10/556
Inventor 刘智鑫肖石林
Owner SHANGHAI JIAO TONG UNIV
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