Wavelength selective switch module

• US 20080050065A1
• Filed: 01/11/2007
• Published: 02/28/2008
• Est. Priority Date: 08/28/2006
• Status: Active Grant

• Current Assignee: Bruker Axs K.K. (Bruker Corporation)
• Original Assignee: Fujitsu Limited
• Inventors: Mori, Kazuyuki, Sakai, Yoshio, Ide, Satoshi
• Granted Patent: US 7,440,649 B2
• Time in Patent Office: Days
• US Class Current: 385/18
• CPC Class Codes: G02B 6/3512 the optical element being reflective, e.g. mirror
• CPC Class Codes: G02B 6/356 in an optical cross-connect device, e.g. routing and switching aspects of interconnecting different paths propagating different wavelengths to (re)configure the various input and output links switching polarized beams G02B6/3594; power equalizers G02B6/356 and G02B6/3594; path selecting means H04Q11/0001
• CPC Class Codes: G02B 6/359 of the position of the moving element itself during switching, i.e. without monitoring the switched beams
• CPC Class Codes: H04Q 11/0005 Switch and router aspects
• CPC Class Codes: H04Q 2011/003 using switches based on microelectro-mechanical systems [MEMS]
• CPC Class Codes: H04Q 2011/0039 Electrical control
• CPC Class Codes: H04Q 2011/0043 Fault tolerance
• CPC Class Codes: H04Q 2011/0049 Crosstalk reduction; Noise; Power budget
• CPC Class Codes: H04Q 2011/0083 Testing; Monitoring

Abstract

A wavelength selective switch module is disclosed. The wavelength selective switch module includes: a unit for generating test light; a multiplexing unit for multiplexing the test light with the wavelength multiplexed light; a splitting unit for splitting the test light from output light of each of two output ports; a feedback control unit for obtaining deflection control amounts for the deflection unit corresponding to a wavelength of the test light such that a light level of the test light that is split from the output light output from each of the two output ports becomes maximum; and a calculation unit for calculating deflection control amounts for output ports other than the two output ports for the deflection unit for the test light and calculating deflection control amounts for output ports for deflection units of wavelengths included in the wavelength multiplexed light using the deflection control amounts for the deflection unit for the test light output from each of the two output ports by which the light level of the test light becomes maximum.

Claims

1. A wavelength selective switch module for splitting wavelength multiplexed light for each wavelength, supplying each wavelength light into a deflection unit, and outputting each wavelength light to one of a plurality of output ports by setting a deflection control amount for the deflection unit, the wavelength selective switch module comprising:

a test light generation unit configured to generate test light;

a multiplexing unit configured to multiplex the test light with the wavelength multiplexed light;

a splitting unit configured to split the test light from output light of each of two output ports of the plurality of output ports;

a feedback control unit configured to perform feedback control for obtaining deflection control amounts for the deflection unit corresponding to a wavelength of the test light such that a light level of the test light that is split from the output light output from each of the two output ports becomes maximum; and

a deflection control amount calculation unit configured to calculate deflection control amounts for output ports other than the two output ports for the deflection unit for the wavelength of the test light and calculate deflection control amounts for output ports for deflection units of wavelengths included in the wavelength multiplexed light using the deflection control amounts for the deflection unit for the wavelength of the test light output from each of the two output ports by which the light level of the test light becomes maximum.

2. The wavelength selective switch module as claimed in claim 1, wherein the test light generation unit generates the test light of a wavelength that is different from each wavelength included in the wavelength multiplexed light.

3. The wavelength selective switch module as claimed in claim 1, wherein the deflection control amount calculation unit obtains the deflection control amounts for the output ports for the deflection unit for the wavelength of the test light by linear interpolation using the deflection control amounts for the deflection unit for the wavelength of the test light output from the two output ports by which the light level of the test light becomes maximum.

4. The wavelength selective switch module as claimed in claim 3, wherein the plurality of output ports are arranged in a line on a supporting member, and the two output ports are output ports of both ends of the plurality of output ports.

5. The wavelength selective switch module as claimed in claim 4, wherein, when the deflection control amounts for the deflection unit for the wavelength of the test light in which optical level of the test light becomes maximum for the two output ports are β

and γ

respectively, and a number of the output ports is n, and when an output port number is p, the deflection control amount calculation unit calculates θ

p=β

+(γ

−

ρ

)·

(p−

1)/(n−

1) as the deflection control amount of an output port of the plurality of output ports for the deflection unit for the wavelength of the test light.

6. The wavelength selective switch module as claimed in claim 5, wherein the deflection control amount calculation unit calculates each of the deflection control amounts for the output ports for the deflection units for the wavelengths included in the wavelength multiplexed light using a control voltage corresponding to θ

p and a coefficient set to each of the deflection units.

7. The wavelength selective switch module as claimed in claim 1, wherein the deflection control amount calculation unit performs level equalization such that light levels of each wavelength in the plurality of output ports become the same, and calculates the deflection control amounts for the output ports for the deflection units for the wavelengths included in the wavelength multiplexed light.

8. The wavelength selective switch module as claimed in claim 1, wherein the deflection unit is a MEMS mirror.