Optical wavelength interlacing filter with bandwidth allocation characteristics adjustable

Abstract

The invention discloses an optical wavelength interlacing filter with the bandwidth allocation characteristics adjustable and belongs to the field of optical fiber communication. The optical wavelength interlacing filter with the bandwidth allocation characteristics adjustable overcomes the defects that the bandwidth of channels with the serial number being odd numbers and even numbers is not adjustable, loss is large and cost is high. According to the interlacing filter, the first port of a 1*2 optical coupler (20) is connected with an input wavelength division multiplexing signal (10), the second port of the 1*2 optical coupler (20) is connected with the first port of a first 2*2 optical coupler (1), and the third port of the 1*2 optical coupler (20) is connected with the first port of a second 2*2 optical coupler (2) through an optical phase modulator (6); the second port and the third port of the first 2*2 optical coupler are connected with the second port and the third port of a third 2*2 optical coupler (3) through a first doped optical fiber (11) and a second doped optical fiber (12) respectively, and the fourth port of the first 2*2 optical coupler is connected with the second port of the second 2*2 optical coupler; the third port and the fourth port of the second 2*2 optical coupler are connected with an odd-number output channel (7) and an even-number output channel (8) respectively; the first port and the fourth port of the third 2*2 optical coupler are connected with a first pump light source (91) and a second pump light source (92) respectively.

Description

technical field [0001] The invention relates to the field of optical fiber communication, in particular to an optical wavelength interleaved filter with adjustable bandwidth distribution characteristics. Background technique [0002] With the rapid development of optical fiber communication technology and the maturity of multimedia communication technology, people's demand for high speed and broadband is increasing. Optical wavelength division multiplexing (WDM) can greatly reduce the cost of network construction by coupling multiple optical signals of different wavelengths into one optical fiber for transmission without setting up new optical fiber lines. However, with the continuous reduction of channel spacing in Dense Wavelength Division Multiplexing (DWDM), more stringent requirements are placed on the performance of filter devices at network nodes, so optical interleaved filters are emerging. The optical wavelength interleaving filter can form a periodic, center wavel...

AI Technical Summary

Problems solved by technology

However, the response function of the single-stage Mach-Zehnder interferometer optical interleaved filter is approximately sinusoidal, and its transmission efficiency is very sensitive to the shift of the signal wavelength; Symmetric optical interleave filters with equal channel bandwidth limit their application in dynamic DWDM systems

Although in recent years, an asymmetric optical interleaved filter has been proposed [Wu Shudong, "Optical interleaved asymmetric filtering method and asymmetric optical interleaved comb filter", national invention patent 200710027527.3], but due to the use of G-T etalon and wave plate, etc. Bulk optical components greatly increase the complexity of the system structure and the connection loss with the communication optical fiber, and the bandwidth allocation of the odd and even channels cannot be adjusted

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