Parallel multichunnel wavelength locking device
A wavelength-locked, multi-channel technology, applied in wavelength division multiplexing systems, electromagnetic wave transmission systems, electrical components, etc., to solve problems such as modulation time reduction, practical application limitations of dense wavelength division multiplexing optical fiber communication systems, and occupation of bandwidth resources. , to achieve the effect of facilitating industrialization
Inactive Publication Date: 2003-12-17
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology
[0004] The existing injection current modulation and time-division multiplexing multi-wavelength locking technology has three disadvantages: one is to modulate the injection current of the DFB laser, and this modulation signal will inevitably enter the optical fiber trunk communication, occupying a certain amount of time in each channel. Bandwidth resource, which is undesirable in optical fiber communication; second, in the process of time-sharing and sequential current modulation, the modulation time of each laser will decrease with the increase of the number of wavelength-locked channels (for example, when 8 wavelengths are locked , the modulation time is about 1 / 16 second, and when 16 wavelengths are locked, the modulation time is about 1 / 32 second)
This brings great difficulties to the photoelectric detection
Therefore, the practical application of dense wavelength division multiplexing optical fiber communication system is limited
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[0014] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0015] The present invention can be used figure 1The structure shown is implemented. In the figure, 1 is a number of DFB lasers of the same type (the number is determined according to the actual needs of the optical fiber communication system, for example, 40, that is, 40 channels are formed at the same time. In the figure, they are respectively represented by 1.1, 1.2, ..., 1.40 , that is, 1.i represents the i-th laser. Other repeating devices also use the same representation, which will not be explained below), and their wavelengths are sequentially separated by about 0.8nm (or about 0.4nm), which is provided by the manufacturer ( Such as CQU915 / 1840, the product of JDS Uniphase Company); 2 is the optical fiber coupler that is used to distinguish the wavelength locking and trunk communication light beam, is made by prior art, and beam splitting rat...
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A parallel multi-channel wavelength locking device for the DFB laser in DWDM optical communication system is disclosed. The wavelength locking beam of each DFB laser is coupled to an optical fibre coupler, whose output is connected to binary-array CCD photoelectric detector directly and via optical collimator array and standard FP. The output of said photoelectric detector is connected to relative differentiator and the differentiator is then connected to the relative temp controller of each DFB laser for loking its wavelength.
Description
Technical field: [0001] The invention relates to an optical fiber communication system formed by applying dense wavelength division multiplexing technology, in particular to a wavelength locker (or called a wavelength stabilizer) used by lasers in the system. Background technique: [0002] In the current optical fiber communication system, several or dozens of light waves of different wavelengths can be used to transmit information in one optical fiber at the same time, which is called Dense Wavelength Division Multiplexing (DWDM for short) technology. It can meet the requirements of modern society for the transmission of large-capacity information. The International Telecommunication Union (ITU) stipulates that the wavelength spacing in DWDM optical fiber communication is 0.8nm and 0.4nm respectively, and the corresponding channel spacing is 100GHz and 50GHz respectively. This requires that the optical wavelengths on each channel must have a high degree of stability, that ...
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IPC IPC(8): H04B10/572H04J14/02
Inventor 谢建平
Owner UNIV OF SCI & TECH OF CHINA