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Method for modulating an optical signal and optical transmitter

一种光信号、发射机的技术，应用在电磁发射器、光学、非线性光学等方向

Active Publication Date: 2006-08-09
WSOU INVESTMENTS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of DPSK-like modulation technology is that it requires an electrical precoder, a constant temperature Mach-Zehnder differential decoder, and an equalized receiver

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  • Method for modulating an optical signal and optical transmitter
  • Method for modulating an optical signal and optical transmitter
  • Method for modulating an optical signal and optical transmitter

Examples

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Embodiment Construction

[0036] Figure 1c An optical transmitter is shown, comprising a laser source 1 followed by a first Mach-Zehnder modulator 2 and a second Mach-Zehnder modulator 3 . The laser source 1 generates a continuous wave optical signal, in the first Mach-Zehnder modulator 2 with a bit rate B=40Gbit / s (not including FEC) corresponding to the bit rate of the subsequent transmission line (not shown) A zero (NRZ) bit electrical signal modulates the intensity of the continuous wave optical signal. The output signal of the first modulator 2 is Figure 2a NRZ optical signal shown in . The NRZ optical signal is used as input to the second dual-way Mach-Zehnder modulator 3 . The second modulator 3 modulates the phase of the NRZ optical signal by performing an alternate π phase shift on the NRZ optical signal every two consecutive bits. Perform ±π phase hopping between successive bit pairs so that successive bit pairs exhibit an alternating sequence of phases: 0, π, 0, π, etc. The phase shift...

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Abstract

A method for modulating an optical signal includes the following steps: modulating the intensity of the optical signal with a nonreturn-to-zero bit signal, and modulating the phase of the optical signal with a periodic phase-shift signal creating an alternating À-phase shift every second, third or more consecutive bit. An optical transmitter for performing the above method comprises a first modulator (2) modulating the intensity of the optical signal with a nonreturn-to-zero bit signal, and a second modulator (3) modulating the phase of the optical signal with a periodic phase-shift signal creating an alternating À-phase shift every second, third or more consecutive bit.

Description

[0001] Cross References to Related Applications [0002] The present invention is based on European priority application EP 05290227.7, the content of which is hereby incorporated by reference. technical field [0003] The invention relates to a method for modulating an optical signal and an optical transmitter for performing such a method. Background technique [0004] Several methods for modulating optical transmission signals are known in the prior art. One of the best-known methods is the non-return-to-zero (NRZ) modulation technique shown in Figure 2. In the NRZ method, each logic bit (logic "1" pulse) is sent with a pulse width equal to the full bit period T = 1 / B, where B is the bit rate (in bits / s) of these pulses to be sent . [0005] Figure 2a A graph showing the intensity (solid line) and phase (dashed line) of a typical NRZ modulated optical signal of a bit signal of 16 consecutive bits with three pairs of consecutive "1" bit pulses. The optical signal inten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/155H04B10/50H04B10/516H04B10/54H04B10/556
CPCH04B10/5161H04B10/5561G02F1/225H04B10/505H04B10/541H04B10/5051G02F2201/16
Inventor 塞巴斯蒂安·比戈埃里克·巴纳松加布里埃尔·沙莱
Owner WSOU INVESTMENTS LLC