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Optical transmitter for transmitting multi-level amplitude keying modulated signals

An optical transmitter and amplitude keying technology, applied in the field of optical communication systems, can solve problems such as expensive

Active Publication Date: 2017-05-31
ALCATEL LUCENT SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 multi-level amplitude keying modulated signals
  • Optical transmitter for transmitting multi-level amplitude keying modulated signals
  • Optical transmitter for transmitting multi-level amplitude keying modulated signals

Examples

Experimental program
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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 multi-stage amplitude keyed modulation signals, including: optical modulators (8), used to modulate optical signals using multi-stage amplitude keying modulation; and a spectral filter ( 11 ) , adapted to increase the high frequency component of the modulated optical signal with respect to the central frequency component of the modulated optical signal. The multi-stage ASK modulation is a quad ask and the symbol rate of the optical modulator is above 40G baud. The optical link (17) connects the optical transmitter to the square law 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 Patents(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