Exhibit 5.1

OPINION OF WILSON SONSINI GOODRICH & ROSATI, PROFESSIONAL CORPORATION

June 26, 2019

Infinera Corporation
140 Caspian Court
Sunnyvale, CA 94089

Re: Registration Statement on Form S-8

Ladies and Gentlemen:

We have examined the Registration Statement on Form S-8 (the “Registration Statement”) to be filed by you with the Securities and Exchange Commission on or about the date hereof, in connection with the registration under the Securities Act of 1933, as amended, of an aggregate of 17,800,000 shares of your common stock, par value $0.001 per share (the “Common Stock”), consisting of (i) 10,500,000 shares of Common Stock (the “2007 Plan Shares”) reserved for issuance under the Amended and Restated 2007 Employee Stock Purchase Plan (the “2007 Plan”), and (ii) 7,300,000 shares of Common Stock (together with the 2007 Plan Shares, the “Shares”) reserved for issuance under the Amended and Restated 2016 Equity Incentive Plan (together with the 2007 Plan, the “Plans”).

As your legal counsel, we have examined the proceedings taken and are familiar with the actions proposed to be taken by you in connection with the issuance and sale of the Shares under the Plans and pursuant to the agreements related thereto.

On the basis of the foregoing, and in reliance thereon, we are of the opinion that the Shares, when issued and sold in the manner referred to in the applicable Plan and pursuant to the agreements which accompany the Plan, will be legally and validly issued, fully paid and nonassessable.

We consent to the use of this opinion as an exhibit to the Registration Statement, and further consent to the use of our name wherever appearing in the Registration Statement and any amendments thereto.

Very truly yours,

/s/ WILSON SONSINI GOODRICH & ROSATI
Wilson Sonsini Goodrich & Rosati
Professional Corporation