Document

We have acted as counsel to Viavi Solutions Inc., a Delaware corporation (the “Company”), in connection with a registration statement on Form S-8 (the “Registration Statement”) to be filed today with the Securities and Exchange Commission (the “Commission”) pursuant to the Securities Act of 1933, as amended (the “Securities Act”), for the registration of an additional 10,500,000 shares of the Company’s common stock, par value $0.001 per share (the “Shares”), to be issued by the Company pursuant to the Viavi Solutions Equity Incentive Plan (the “Equity Incentive Plan”).

We have participated in the preparation of the Registration Statement and have reviewed the originals or copies certified or otherwise identified to our satisfaction of all such corporate records of the Company and such other instruments and other certificates of public officials, officers and representatives of the Company and such other persons, and we have made such investigations of law, as we have deemed appropriate as a basis for the opinion expressed below. We have further received a Secretary’s Certificate dated January 29, 2026 from Kevin Siebert, Senior Vice President, General Counsel and Secretary of the Company, representing to us that the Company has available a sufficient number of shares authorized and available for issuance, together with shares authorized and issued but not outstanding, to deliver the Shares under the Plan, and are relying on such representation.

In rendering the opinion expressed below, we have assumed the authenticity of all documents submitted to us as originals and the conformity to the originals of all documents submitted to us as copies. In addition, we have assumed and have not verified the accuracy as to factual matters of each document we have reviewed.

Based on the foregoing, and subject to the further assumptions and qualifications set forth below, it is our opinion that the Shares to be issued pursuant to the Plan have been duly

We hereby consent to the use of this opinion as a part (Exhibit 5.1) of the Registration Statement. In giving such consent, we do not thereby admit that we are within the category of persons whose consent is required under Section 7 of the Securities Act or the Rules and Regulations of the Commission thereunder. The opinion expressed herein is rendered on and as of the date hereof, and we assume no obligation to advise you, or to make any investigations, as to any legal developments or factual matters arising subsequent to the date hereof that might affect the opinion expressed herein.