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Optical transmitter for transmitting a multilevel amplitude-shift-keying modulated signal

A technology of optical transmitter and modulation signal, which is applied in the field of optical communication system and can solve the problems of expensive

Active Publication Date: 2015-04-08
ALCATEL LUCENT SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, coherent detection solutions may be too expensive for some applications (e.g., short-distance transmission)

Method used

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  • Optical transmitter for transmitting a multilevel amplitude-shift-keying modulated signal
  • Optical transmitter for transmitting a multilevel amplitude-shift-keying modulated signal
  • Optical transmitter for transmitting a multilevel amplitude-shift-keying modulated signal

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Embodiment Construction

[0034] figure 1 An optical transmitter 1 is shown for generating a 100 Gb / s modulated optical signal based on 4-level amplitude keying (4-ASK). Such a 4-ASK modulated signal can be used for short distance transmission using direct detection.

[0035] The transmitter 1 comprises a binary signal generator 2 which generates four NRZ-encoded binary streams 3 at a clock rate of 28 GHz. Two multiplexers 4 are arranged to receive two binary streams 3 each. The multiplexer 4 is driven by a 56GHz clock signal 5 to interleave the two binary streams 3 into a 56Gb / s NRZ encoded binary stream 6 . The two resulting 56Gb / s binary streams 6 are fed to a 2-bit DAC 7 which generates a 4-level drive signal I and a complementary 4-level signal I to drive the push-pull mode The Mach-Zehnder modulator 8 (MZM) in .

[0036] The push-pull mode means that binary driving signals having opposite phases to each other are input to the data input terminal and the reverse data input terminal of the MZM ...

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Abstract

An optical transmitter for transmitting a multilevel amplitude-shift-keying modulated signal comprises an optical modulator (8) for modulating an optical signal with a multilevel amplitude-shift-keying modulation, and a spectral filter (11) adapted to increase a highfrequency component of the modulated optical signal relatively to a central frequency component. The multilevel ASK modulation is quaternary ASK and the symbol rate of the optical modulator is above 40Gbaud. An optical link (17) connects the optical transmitter to a quadratic direct detection optical receiver (15).

Description

technical field [0001] The invention relates to the technical field of optical communication systems, in particular to communication systems using multi-level amplitude keying (ASK) modulation schemes. Background technique [0002] Optical fiber transmission with coherent detection makes it possible to achieve very high data rates over long distances, eg typically 100Gb / s per wavelength channel. However, coherent detection solutions may be too expensive for some applications (eg, short distance transmission). Therefore, there is a need for optical transmission techniques that achieve high data rates and remain compatible with direct detection of signal strength at the destination node, ie square-law detection. Contents of the invention [0003] In one embodiment, the present invention provides an optical transmitter for transmitting a multi-level amplitude keying modulation signal, comprising: an optical modulator for modulating the optical signal using multi-level amplit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/50H04B10/564
CPCH04B10/504H04B10/564H04B10/54
Inventor J·勒诺迪尔G·沙莱H·马多扬
Owner ALCATEL LUCENT SAS