UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G

o

Rule 13d-1(b)

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Rule 13d-1(c)

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Rule 13d-1(d)

CUSIP No. 31787A101

1.

Names of Reporting Persons. I.R.S. Identification Nos. of above persons (entities only)
Infineon Technologies AG

2.

Check the Appropriate Box if a Member of a Group (See Instructions)

(a)

(b)

3.

SEC Use Only

4.

Citizenship or Place of Organization
Germany

Number of
Shares
Beneficially
Owned by
Each
Reporting
Person With:

5.

Sole Voting Power
0

6.

Shared Voting Power
34,000,000

7.

Sole Dispositive Power
0

8.

Shared Dispositive Power
34,000,000

9.

Aggregate Amount Beneficially Owned by Each Reporting Person
34,000,000

10.

Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)  o

11.

Percent of Class Represented by Amount in Row (9)
13.2%

12.

Type of Reporting Person (See Instructions)
CO

Item 1.

(a)

Name of Issuer
Finisar Corporation

(b)

Address of Issuer’s Principal Executive Offices
1308 Moffett Park Drive, Sunnyvale , CA 94089

Item 2.

(a)

Name of Person Filing
Infineon Technologies AG

(b)

Address of Principal Business Office or, if none, Residence
St.-Martin-Str. 53
D-81669 Munich Germany

(c)

Citizenship
Germany

(d)

Title of Class of Securities
Common Stock, Par Value $0.0001 Per Share

(e)

CUSIP Number
45662N103

Item 3.

If this statement is filed pursuant to §§240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:

(a)

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Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o).

(b)

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Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c).

(c)

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Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c).

(d)

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Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C 80a-8).

(e)

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An investment adviser in accordance with §240.13d-1(b)(1)(ii)(E);

(f)

o

An employee benefit plan or endowment fund in accordance with §240.13d-1(b)(1)(ii)(F);

(g)

o

A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);

(h)

o

A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);

(i)

o

A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);

(j)

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Group, in accordance with §240.13d-1(b)(1)(ii)(J).

Not applicable

Item 4.

   Ownership

Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1.

(a)

Amount beneficially owned:   
34,000,000

(b)

Percent of class:   
13.2%

(c)

Number of shares as to which the person has:

(i)

Sole power to vote or to direct the vote   
0

(ii)

Shared power to vote or to direct the vote    
34,000,000

(iii)

Sole power to dispose or to direct the disposition of   
0

(iv)

Shared power to dispose or to direct the disposition of   
34,000,000.

Item 5.

Ownership of Five Percent or Less of a Class

Not applicable.

Item 6.

Ownership of More than Five Percent on Behalf of Another Person

Not applicable.

Item 7.

Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company or Control Person

Not applicable.

Item 8.

Identification and Classification of Members of the Group

Not applicable.

Item 9.

Notice of Dissolution of Group

Not applicable.

Item 10.

Certification

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect.

Date: February 3, 2005

Infineon Technolgies AG

By:

/s/ Horst Meyer

Horst Meyer

Corporate Legal Counsel

By:

/s/ Nicole Lau

Nicole Lau

Corporate Legal Counsel