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Optical transmitter, optical transmission method and optical transmission system

A technology of optical transmitter and optical receiver, which is applied in the field of optical communication, can solve problems such as increasing the complexity of FSK modulators, and achieve the effects of simple structure, overcoming performance degradation, and easy implementation

Inactive Publication Date: 2011-10-26
HUAWEI TECH CO LTD +1
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  • Description
  • Claims
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Problems solved by technology

These features above greatly increase the complexity of this high-speed FSK modulator

Method used

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  • Optical transmitter, optical transmission method and optical transmission system
  • Optical transmitter, optical transmission method and optical transmission system
  • Optical transmitter, optical transmission method and optical transmission system

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Embodiment Construction

[0046] When the channel transmission rate of the system rises above 40Gbit / s, the higher the utilization rate of network bandwidth, the longer the transmission distance, and the greater the transmission damage caused by the nonlinear effect of optical fiber. For ASK modulated signals, the optical signal-to-noise ratio of the receiver (hereinafter referred to as: OSNR) has a linear relationship with the fiber input power, while the nonlinear effect of the fiber has a super-linear relationship with the fiber input power. By increasing the fiber input power, the The method of improving OSNR will not work. Therefore, the nonlinear effect of optical fiber has become a fatal factor that restricts the improvement of network system bandwidth and the extension of transmission distance. Advanced modulation methods such as Differential Phase Shift Keying (hereinafter referred to as DPSK) and Frequency Shift Keying (hereinafter referred to as FSK) have begun to show the superiority of hig...

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Abstract

The embodiment of the invention relates to an optical transmitter and an optical transmission method. The optical transmission method comprises the following steps that : a pulse cutter carries out the pulse cutting on two optical signals with different frequencies so as to produce a return-to-zero light pulse signal; a phase modulator carries out the phase modulation on a loaded data signal and loads the data signal onto the return-to-zero light pulse signal; and a delay interferometer demodulates the data signal which is subjected to the phase modulation and loaded onto the return-to-zero light signal so as to obtain an amplitude modulation light signal, and merges the signals and outputs a return-to-zero frequency shift keying modulation light signal. The embodiment of the invention also relates to an optical transmission system. The system comprises the optical transmitter, a transmission network and an optical receiver. The optical transmitter, the optical transmission method andthe optical transmission system of the embodiment of the invention adopt an external modulation mode so as to make the frequency bandwidth of the optical transmitter only influenced by an external modulator; a carrier wave inhabitation method is adopted to overcome the performance reduction caused by the frequency drift of lasers when two lasers produce light signals; and the invention has a simple structure and easy realization.

Description

technical field [0001] The invention relates to the technical field of optical communication, in particular to an optical transmitter, an optical transmitting method and an optical transmission system. Background technique [0002] The rapid development of the information industry poses three major challenges to the current optical transport network: transmission distance, bandwidth efficiency, and optical layer processing functions, including: optical cross-connect and add-drop multiplexing. Traditional optical communication technology uses amplitude modulation technology, also known as amplitude shift keying (Amplitude Shift Keying, hereinafter referred to as ASK), that is, the carrier amplitude changes with the modulating signal; in its simplest form, the carrier is modulated in binary On-off under signal control, this method can also be called on-off keying or ON-OFF keying (OOK for short). Using amplitude modulation technology, the change of light intensity will lead t...

Claims

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Application Information

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IPC IPC(8): H04L25/49H04B10/145H04B10/155H04B10/508H04B10/548
Inventor 迟楠操时宜
Owner HUAWEI TECH CO LTD
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