Multi-band hybrid SOA-Raman amplifier for CWDM

An amplifier and SOA technology, which is applied in laser devices, wavelength division multiplexing systems, electromagnetic wave transmission systems, etc., can solve the problems of reducing the dynamic range of pure SOA technical solutions and unsatisfactory solutions

Inactive Publication Date: 2006-12-27
AMERICAN TELEPHONE & TELEGRAPH CO
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Problems solved by technology

[0004] Although in practice each semiconductor optical amplifier (SOA) is capable of amplifying up to 4 CWDM channels, the trade-off between maintaining sufficient optical signal-to-noise ratio (OSNR) and reducing crosstalk caused by gain saturation reduces pure dynamic range of the SOA solution, making it unsuitable for systems with cascaded amplifiers

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  • Multi-band hybrid SOA-Raman amplifier for CWDM
  • Multi-band hybrid SOA-Raman amplifier for CWDM
  • Multi-band hybrid SOA-Raman amplifier for CWDM

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Embodiment Construction

[0027] Now described is a multi-band hybrid SOA Raman amplifier capable of amplifying all 8 CWDM channels commonly used in modern commercial systems. As described herein, the single design of the amplifier not only facilitates simultaneous amplification of the 8-channel band, but also enables relatively long-distance transmission via multi-amplifier cascading.

[0028] hybrid amplifier

[0029] The inventors measured the gain and transmission system bit error rate performance of a broadband (4-channel from 1510nm to 1570nm) hybrid amplifier based on a single SOA and a single Raman pump laser. The amplifier 100 described above for the DWDM system has also been figure 1 shown inside. Backpropagating semiconductor Raman pump laser 120 is coupled to delivery fiber 110 with wavelength demultiplexing (WDM) coupler 130 , conventional polarization independent SOA 140 and optical isolator 150 .

[0030] The Raman pump wavelength is selected to be provided to the SOA such that the co...

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Abstract

A multi-band hybrid amplifier is disclosed for use in optical fiber systems. The amplifier uses Raman laser pumps and semiconductor optical amplifiers in series to produce a relatively level gain across the frequency range of interest. Multiple Raman pumps are multiplexed before coupling into the fiber. The Raman amplified optical signal may be demultiplexed and separately amplified by the SOAs before remultiplexing. Gain profiles of the Raman pumps and the SOAs are selected to compensate for gain tilt and to alleviate the power penalty due to cross-gain modulation in the SOAs. The disclosed hybrid amplifier is especially useful in coarse wavelength division multiplexing (CWDM) systems.

Description

technical field [0001] The present invention generally relates to the transmission of multiple wavelength channels on a single optical fiber over suitable distances, and more particularly to multi-band hybrid amplifiers for coarse wavelength division multiplexing transmission systems. technical background [0002] Coarse wavelength division multiplexing (CWDM) has recently emerged as an inexpensive technique for delivering multiple wavelength channels over a single optical fiber over modest distances. The low cost of CWDM relative to Dense Wavelength Division Multiplexing (DWDM) is due to the fact that CWDM spectrum has fewer amplitude levels than typical DWDM spectrum. The ITU standard of CWDM defines a maximum of 18 wavelength channels, in which the channel-to-channel wavelength interval is 20nm. Larger channel spacing allows 13nm channel width, which in turn allows the use of inexpensive CWDM optics and directly modulated, uncooled semiconductor laser transmitters. In c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/17H04J14/02H01S3/067H01S3/23H04B10/291H04B10/294
Inventor 帕特里克·P.·艾恩诺恩肯尼斯·C.·雷克曼周翔
Owner AMERICAN TELEPHONE & TELEGRAPH CO
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