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Power manageable optical OFDM transponder

A transmitter and bit rate technology, applied in the field of optical transmission systems, to reduce power consumption, reduce operating costs, and improve reliability

Inactive Publication Date: 2012-01-25
ALCATEL LUCENT SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In typical optical OFDM transceivers, it is not possible to change to reduced power consumption where the usage requirements are lower (i.e., "low end")

Method used

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  • Power manageable optical OFDM transponder
  • Power manageable optical OFDM transponder
  • Power manageable optical OFDM transponder

Examples

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Embodiment Construction

[0035] Figure 1a and 1b Two OFDM signals 100 and 120 comprising different numbers of OFDM subcarriers 104, 124 and using different constellations 103, 123 are shown. OFDM subcarriers 104, 124 are plotted on a magnitude 101, frequency 102 graph. Figure 1a An OFDM signal 100 comprising 4 subcarriers 104 and using QPSK (Quadrature Phase Shift Keying) modulation (ie using a 2-bit constellation per subcarrier) is shown. on the other hand, Figure 1b An OFDM signal 120 comprising 2 subcarriers 124 and using QAM 16 (Quadrature Amplitude Modulation) modulation (ie using a 4-bit constellation per subcarrier) is shown. Such as Figure 1a and Figure 1b As shown in , the subcarrier spacing, that is, the frequency spacing between two adjacent OFDM subcarriers, remains constant.

[0036] It can be appreciated that both OFDM signals 100 and 120 carry the same amount of information, ie they have the same bit rate. However, OFDM signal 100 has a higher bandwidth than OFDM signal 120 . ...

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Abstract

The invention relates to the field of optical transmission systems. In particular, the invention relates to a system and a method for adjusting an optical OFDM transmission system in a power optimized manner. An optical OFDM transmitter (310) operating at an overall bit-rate is provided. It comprises an adjustable mapping unit (314) associated with one of N OFDM subcarriers, operable to map M bits of a digital input signal (360) into a constellation point, thereby yielding a subcarrier signal of the corresponding OFDM subcarrier. Furthermore, it comprises an adjustable transformation unit (315, 316), operable to transform the subcarrier signal to yield an electrical output signal. In addition, the OFDM transmitter comprises an electrical-to-optical converter (324, 325), operable to convert the electrical output signal into an optical output signal. Finally, the OFDM transmitter comprises a control unit (311, 312), operable to select the number of OFDM subcarriers N and the number of bits M, such that the electrical power consumption of the OFDM transmitter (310) is minimized for the overall bit-rate and operable to adjust the adjustable mapping unit (314) and the adjustable transformation unit (315, 316) according to the selected numbers M and N.

Description

technical field [0001] The invention relates to the field of optical transmission systems. In particular, the present invention relates to systems and methods for tuning an optical OFDM transmission system in a power-optimized manner. Background technique [0002] In the near and mid-term future, it is expected that 40Gb / s, 100Gb / s and even up to 1Tb / s transceivers will be based on coherent detection combined with digital signal processing (DSP). This technology exhibits very high performance in terms of its reach, ie high distortion tolerance and high sensitivity, but this advantage is accompanied by high power consumption and power dissipation. [0003] Typically, network resources are designed for the worst case for transmission channel conditions and bit rate requirements, therefore, "high end" transceivers are used. In the common electronic layout of those transceivers used in coherent transmission systems, power-intensive system elements such as DSP (Digital Signal P...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L1/00
CPCH04L1/0003H04L5/0046H04L27/26H04B10/50H04B10/00
Inventor H·比洛
Owner ALCATEL LUCENT SAS
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