<PAGE>

                                                                   Exhibit 10.18

                             SUBLEASE AGREEMENT

This Sublease Agreement is made and entered into the 29 day of February 2000 by
and between Wyse Technology Inc. (hereinafter "Sublessor") and Oplink
Communications Inc. (hereinafter "Sublessee") and Wyse Technology Investments
Inc. (hereinafter "Landlord").

This Sublease is subordinate to and generally controlled by a lease, dated March
19, 1993 (as amended) between Landlord and Sublessor ("Lease"). The provisions
of the Lease are attached (as Exhibit A) hereto and incorporated by reference
for all purposes. Where the provisions of this Sublease are specifically stated
and differ from those in the Lease, the provisions of the Sublease shall
control.

For consideration of the rent, covenants, agreements and conditions herein
contained, Sublessor, Sublessee and the Landlord hereby agree as follows:

1.      SUBLEASED PREMISES. Sublessor leases from Landlord certain premises
        which constitute approximately 62,023 square feet of the building
        located at 3475 North First St., San Jose, CA 95134 (hereinafter
        referred to as "Premises") which are a portion of the property
        ("Campus") which is the subject of that certain Lease dated March 19,
        1993 (and as amended and restated) between Sublessor and Landlord.

        Sublessor hereby subleases to Sublessee, and Sublessee hereby subleases
        from Sublessor, for the term and upon conditions herein after set
        forth, the Subleased Premises, as shown on the drawing attached hereto
        as Exhibit B and incorporated herein by this reference. The Subleased
        Premises contains 62,023 rentable square feet. Landlord hereby provides
        his unqualified consent to this sublease of the Subleased Premises.

2.      TERM. Subject to the terms and conditions set forth herein, the term of
        this Sublease shall commence on or about March 1, 2000 (the
        "Commencement Date"), and shall terminate on February 28, 2005, except
        that it is understood and agreed by the Sublessee and the Sublessor
        that the right and interest of Sublessee under this Sublease are
        derivative of those of Sublessor under the Lease between Sublessor
        Landlord and not any greater than such rights and interest of Sublessor
        as to the Subleased Premises.

3.      RENEWAL OPTION. Provided Sublessee is not in default, Sublessee may
        extend the Sublease term. Sublessee may, upon provision of ninety (90)
        days written notice prior to the end of the term, extend the term for
        an additional period of one year. At the end of that term, Sublessee
        may again extend for an additional one-year period. Any such extension
        shall be upon the same Sublease terms, except that the rent rate shall
        change to the then- current fair market value, but in no event shall
        the rate be less than the rate Lessee is paying at the end of the
        preceding term.

4.      USE. Sublessee is permitted to use the Subleased Premises for office,
        R&D, manufacturing and warehouse activities.

5.      RENT.


                                      1.
<PAGE>


         (a)    During the term of this Sublease, and commencing on the
                Commencement Date Sublessee covenants and agrees to pay to
                Sublessor $1.75 per rentable square foot (RSF) per month as
                Base Rate for the Subleased Premises, without previous notice
                or demand. The monthly rent, therefore, will be $108,540.25.
                The rent payment shall be delivered to Sublessor on or before
                the first day of each calendar month during the term of the
                sublease hereof, with the first such monthly installment to be
                paid upon the signature of the Sublease.

         (b)    If the Commencement Date shall occur on a date other than the
                first day of a calendar month, Sublessee shall pay to
                Sublessor on the first day of the month next succeeding the
                Commencement Date a sum equal to one-thirtieth (1/30) of the
                months rent installment of the Base Rate set forth above,
                multiplied by the number of days of the calendar month in
                which the Commencement Date occurred. This pro-rata payment of
                the Base Rate for the portion of the month of the Commencement
                Date shall be in addition to the monthly installment of the
                Base Rate applicable to that month.

         (c)    Increases to Base Rent. At the end of the 2nd year of the
                term, the rent shall increase by 3%. The base rate shall then
                be $1.80 per RSF. Thereafter, the base rent shall remain
                unchanged for the balance of the term.

         (d)    As security for Sublessee's faithful performance under the
                Sublease, Sublessee shall upon execution of the Sublease the
                sum of $108,540.25 (equaling one month's Base Rate) for
                security deposit. This deposit shall not be applied by
                Sublessee as last month's rent under the Sublease. The balance
                of the security deposit will be remitted to Sublessee within
                forty-five (45) days of the termination of the Sublease
                (unless the Sublease is terminated for default of Sublessee.)

         (e)    Gross Rent. The base rent is on a gross, not triple net,
                basis. Sublessee shall not be obligated to pay any
                "additional" rent such as common area maintenance charges,
                operating expenses, real estate taxes and the like. However,
                personal property taxes on Sublessee owned property or income
                taxes shall be the sole responsibility of Sublessee.

         (f)    Late Payments. In the event that Sublessee fails to remit
                payments as described above, Sublessee shall additionally be
                liable for the greater of (i) interest on the unpaid amount,
                calculated at twelve percent (12%) per year or (ii) liquidated
                damages of $250.00.

         (g)    Rent Inclusions. In addition to subsection (e) above, the
                gross rental rate includes access to and use of (i) the
                existing electronic security system as currently installed in
                the Premises; (ii) use by Sublessee's on-site employees and
                guests of the cafeteria; (iii) use by Sublessee's on-site
                employees (excluding contractors or temporary workers) of the
                recreation center (including lockers, showers, weight room,
                racquetball courts, basketball court, tennis court, sauna,
                pool and Jacuzzi) so long as Landlord and Sublessor operate
                these benefits for its own employees. Rent does not include
                janitorial services to the Premises.


                                      2.
<PAGE>


6.      CONDITION OF SUBLEASED PREMISES. Sublessee hereby agrees to accept the
        Subleased Premises on an "as is", "as built" condition on the
        Commencement Date of the term of this Sublease, it being understood and
        agreed that Sublessor makes no warranties, express or implied, as to
        the Subleased Premises including by way of example, and not limitation,
        any warranties of suitability, fitness for purpose of use or
        habitability, except that Sublessor will vacate the Subleased Premises
        and make them available to Sublessee on or before 1 March 2000.

7.      TENANT IMPROVEMENTS. Sublessee desires to modify and improve the
        Premises. Subject to Sublessor and Landlord's reasonable approval of
        the final plans and agreement as to the disposition of such
        improvements upon the termination of the Sublease, Sublessor and
        Landlord hereby grant approval. Sublessee shall be responsible for the
        supervision of and successful completion of all work by the use of a
        licensed, bonded contractor. Agreed improvements, the cost thereof and
        the final disposition thereof shall be set forth in Exhibit C which
        shall be incorporated by reference for all purposes.

        Such improvements shall be constructed partially at Landlord's expense
        and partially at Subtenant's expense: The first $60,000 will be
        contributed by Digital Microwave Corporation (for the benefit of
        Landlord and Sublessor) in accordance with a separate (termination)
        agreement between Digital and Sublessor and Landlord. Landlord will
        contribute $250,000. Any sums required to complete the improvements
        exceeding $310,000 shall be paid solely by Sublessee. Sublessee shall
        indemnify and hold Landlord and Sublessor harmless for any mechanics or
        materialmen's liens arising from the construction of the improvements.

        Landlord shall own the title to all Tenant Improvements irrespective of
        which party may provide the funding to construct.

        Any other alterations during the term shall be as per Section 13 of the
        Lease

8.      UTILITIES. Sublessor shall bill Sublessee monthly for natural gas,
        water and electricity on a pro rata basis (62,023/167,200). Sublessee
        shall contract on its own for other utilities, such as telephone and
        data lines, at its own expense.

9.      INSURANCE. Sublessee shall, throughout the term of the Sublease
        maintain insurance coverage adequate to meet its obligations under the
        Sublease, including business interruption insurance. Sublessee shall,
        within fifteen (15) calendar days of the Commencement Date, provide
        Sublessor with a certificate of insurance naming Landlord and Sublessor
        as additional named insureds. Such insurance shall have the following
        minimum coverages:
                 a) General Liability of 2,000,000 aggregated/1,000,000 each
                 occurrence;
                 b) Automobile Liability $1,000,000 aggregated & each
                 occurrence;
                 c) Workers Compensation and Employers' Liability $1,000,000
                 aggregated & each occurrence;
                 d) Umbrella Coverage $10,000,000 aggregated & each occurrence.


                                      3.
<PAGE>

10.     REPAIRS AND MAINTENANCE. Sublessee shall generally keep the Premises
        clean and in good order and repair during the term and shall comply
        with all applicable laws and regulations pertaining to the use of the
        Premises.

        (a)    Landlord/Sublessor's Obligation to Maintain and Repair. The
               campus and the exterior walls and roof of the Premises shall
               be maintained and repaired by Landlord. Landlord is also
               responsible for the foundation, structural supports, floors
               (but not floor coverings), utilities to the common areas,
               common areas including driveways, sidewalks parking lot.

        (b)    Sublessee's Obligations to Maintain and Repair. Sublessee
               shall, at Sublessee's sole cost and expense keep and maintain
               the interior non- structural portions of the Premises, the
               exterior doors and exterior glass of the Premises excepting
               for damage caused by an insured casualty. Sublessee shall also
               maintain the improvements to the Premises and all fixtures.
               Landlord shall have no responsibility therefore except where
               due to the gross negligence or willful misconduct of Landlord.

11.     SUBLESSEE'S COVENANTS.

        (a)    Except as set forth in this Agreement, all Sublessee's
               covenants and obligations to the Sublessor and the Landlord
               under this Sublease shall be the same as the covenants and
               obligations of Sublessor to Landlord under the Lease and all
               Amendments hereto, which are attached hereto as Exhibit A and
               incorporated herein by reference, to the extent that such
               covenants and obligations are applicable to the Subleased
               Premises and the Sublease terms.

        (b)    Sublessee hereby covenants and agrees to indemnify, hold
               harmless and at the option of Sublessor, defend Sublessor in
               all suits, actions and proceedings arising out of, related to,
               or concerning either (i) any default or non-performance by
               Sublessee of this Sublease, including without limitation,
               those covenants and obligations undertaken in the preceding
               subparagraph, or (ii) the use or occupancy by Sublessee of the
               Subleased Premises, except to the extent that such arises from
               the negligence or willful misconduct on the part of the
               Sublessor.

        (c)    In the event of any dispute and/or litigation between the
               Sublessee and the Landlord, the Sublessee will hold the
               Sublessor harmless.

12.     SUBLESSOR COVENANTS.

        (a)    Except as set forth above or as otherwise required by the
               context of the Lease, all of the Sublessor's covenants and
               obligations under the Sublease shall be the same as the
               covenants and obligations of Landlord to Sublessor under the
               Lease and all Amendments thereto.

        (b)    In the event of any dispute and/or litigation between the
               Sublessor and the Landlord, the Sublessor will hold the
               Sublessee harmless.


                                      4.
<PAGE>

13.     LANDLORD COVENANTS. Except as set forth herein, or as otherwise
        required by the contents of the Lease, all of Landlord's covenants and
        obligations under the Sublease shall be the same as the covenants and
        obligations of Landlord to Sublessor under the Lease and all Amendments
        thereto.

14.     PARKING. A minimum of four (4) parking spaces per each 1,000 RSF shall
        be available to Sublessee. Such parking spaces shall be identified in a
        general manner on Exhibit B. The spaces will not be reserved or
        specifically marked as being only for the benefit of Sublessee. Use
        thereof shall be in accordance with any current Landlord or Sublessor
        rules or regulations governing same.

15.     OPTION TO EXPAND. During the term of the Sublease, including any
        renewal term, Sublessee shall have the first option to lease any space
        which Landlord and/or Sublessor may make available for lease.
        Notwithstanding the foregoing, neither Landlord or Sublessor are
        obligated to make any additional space available. The rent for any
        expansion space will be at then-current fair market value as agreed by
        the Parties.

16.     SIGNS. Subject to the provisions of applicable City of San Jose law or
        regulations or other governmental agencies and subject to the
        reasonable approval of Sublessor and Landlord, Sublessee may install
        appropriate signage at (i) the entrance to the campus driveway; (ii)
        directional signs to assist visitors to locate Sublessor's entrance(s);
        (iii) on or near the Leased Premises for purposes of identifying same.

17.     FIRST RIGHT OF REFUSAL. (a) Landlord and Sublessor have leased space in
        the Campus to Pacific Bell. Pacific Bell's sublease expires in January
        2002 and it includes the option to extend their lease for a period of
        3, 4 or 5 years. In the event that Pacific Bell chooses to terminate
        its lease at the end of the initial term Sublessor and Landlord shall
        grant Sublessee a right of first refusal for whatever portion of the
        space (all or part--less the Premises) Sublessor and Landlord decide to
        offer for lease at that time. (b) Sublessor and Landlord will also give
        Sublessee a right of first refusal on any other campus space which
        Landlord may make available for lease during the term of this Sublease.

18.     Miscellaneous.

        (a)    The terms "Sublessor", "Sublessee' and "Landlord" shall, as
               applicable, include their legal representatives, successor and
               assigns. All covenants herein made binding upon Landlord,
               Sublessee and Sublessor shall be equally binding on its
               agents, employees and others claiming the right to be in the
               Subleased Premises through or under the Sublessee or
               Sublessor. The Sublease shall be binding upon and shall inure
               to the benefit of the parties hereto and their respective
               assigns.

        (b)    This Sublease shall be governed by the laws of the State of
               California.

        (c)    All notices required to be made hereunder shall be sent to the
               following addresses, or such other addresses as a party may
               later designate:


                                      5.
<PAGE>


               TO SUBLESSEE:

               Oplink Communications Inc.
               3475 N. First St.
               San Jose, CA 95134
               Attention: Facilities Manager

               TO SUBLESSOR:

               Wyse Technology Inc.
               3471 N. First St., MS 150-3
               San Jose, CA 95134-1803
               Attention: Director of Facilities

               TO LANDLORD:

               Wyse Technology Investments Inc.
               C/o Wyse Technology Inc.
               3471 N. First St.
               San Jose, CA 95134-1803
               Attention: President

        (d)    Each of the parties hereby represents that other than Colliers
               International it has not obtained the services of a real
               estate broker or agent for the purposes of leasing the
               Subleased Premises and that it will indemnify and hold
               harmless the other parties from such claims in the event that
               any other party established a right derived from such
               indemnifying party to receive commissions or any payment as a
               consequence of this Sublease. Any or all brokers fees are the
               subject of separate agreement(s) and Sublessee acknowledges
               that neither Sublessor or Landlord have any obligation
               thereunder for the payment of any fees whatsoever.

        (e)    The parties hereby agree that there shall be no recording of
               this Sublease or notice of this Sublease in any registry of
               deeds with any public agency, and that the terms and
               conditions of this Sublease are confidential and shall not be
               disclosed to any third party without a need to know for
               financial, legal or other substantial reasons.

        (f)    Sublessee agrees to reimburse all of Sublessor's costs and
               expenses in seeking and obtaining any judicial enforcement of
               this Sublease, including, without limitation, all resulting
               reasonable attorneys fees.

        [intentionally blank--continued on next page]


                                      6.
<PAGE>

        (g)    Special Access to Premises. In addition to rights of access
               set forth in Section 12 of the Lease, Sublessor shall, at all
               reasonable times (and upon reasonable notice except in cases
               of emergency) have access via the Premises to the "roof access
               door" located therein.

        (h)    Assignment. Sublessee shall not assign this Sublease or any of
               its rights or obligations hereunder without the written
               consent of both Sublessor and Landlord. Such consent shall not
               be unreasonably withheld provided the proposed assignee is
               financially sound, will use the Premises for similar purposes,
               and Sublessee agrees to remain responsible, as assignor, for
               assignee's performance.

In witness whereof, the parties hereto have caused this instrument to be
executed in triplicate as of the date first written above.

SUBLESSEE                         SUBLESSOR
OPLINK COMMUNICATIONS INC.        WYSE TECHNOLOGY INC.

BY:  /s/ Joseph Liu               BY:  /s/ Phil Underwood
   --------------------------           ------------------------------

  Joseph Liu                        Phil Underwood
-----------------------------     ------------------------------------
(Print or type name)              (Print or type name)

  CEO                               Vice President Admin. and Sales Operations
-----------------------------     --------------------------------------------
(Title)                           (Title)

  02/29/00                          February 29, 2000
------------------------------    --------------------------------------------
(Date)                            (Date)



LANDLORD
WYSE TECHNOLOGY INVESTMENTS INC.

BY:  /s/ Douglas C. Chance
   ---------------------------

Douglas C. Chance
------------------------------
(Print or type name)

President & CEO
------------------------------
(Title)

February 29, 2000
------------------------------
(Date)


                                      7.
<PAGE>


                                    EXHIBIT A

                       COPY OF LEASE BETWEEN WTI AND WYSE

                                   (attached)


                                      8.
<PAGE>


                      AMENDED AND RESTATED LEASE AGREEMENT

LANDLORD:  Wyse Technology Investments, Inc., a California corporation

TENANT:    Wyse Technology, Inc., a Delaware corporation

PREMISES:  Buildings located at
           3471-3475 North First Street
           San Jose, California

DATE:      March 19, 1993


                                      9.
<PAGE>


                             BASIC LEASE INFORMATION
                             -----------------------

Landlord:                            Wyse Technology Investments, Inc.,
                                     a California corporation

Landlord's Taxpayer I.D. No.:        77-0311-526

Tenant:                              Wyse Technology, Inc.,
                                     a California corporation

Tenant's Taxpayer I.D. No.:          94-2757606

Project:                             The three building complex located at
                                     the corner of North First Street and
                                     River Oaks Place in San Jose, California

Premises (Section 1.a.):             Amenities Space Address:

                                     3471 North First Street
                                     San Jose, California
                                     Approximately 2&,100 square feet

                                     Building 2 Address:

                                     3471 North First Street
                                     San Jose, California [lst and 2nd Floors]:
                                     Approximately 88,818 rentable square feet

                                     Building 3 Address:

                                     3471 North First Street
                                     San Jose, California

                                     Approximately 1&3,400 rentable square
                                     feet of the one-story Building (entire
                                     building)

Rentable Square Footage of           24,l00
Amenities Space (Section 1.d.):

Rentable Square Footage of           167,200
Building 2 (Section 1.d.):

Rentable Square Footage of           143,400
Building 3 (Section 1.d.):

Rentable Square Footage of           433,700
Project (Section 1.d.):


                                     10.
<PAGE>


Rentable Square Footage of           237,926
Premises (Section 1.d.)

Usable Square Footage of             24,100 square feet in Amenities Space;
Premises (Section 1.d.).:            up to 88,818 square feet in Building 2;
                                     and 143,000 square feet in Building 3


Total:                               max 255,918 square feet

Use (Section 15.a.  ):               Computer manufacturing and research and
                                     development facility

Term (Section 2):                    Ten (10) years commencing on Commencement
                                     Date

Commencement Date                    June 1, 1992
(Section 2.b.):

Monthly Rate Rent (Section 4):                            Monthly Rental Rate
                                           Month       Per Rentable Square Foot
                                     ---------------- -------------------------
                                           0-7                   $0.82

                                           8-19                   1.20

                                          20-31                   l.30

                                          32-43                   1.25

                                          44-55                   1.20

                                          56-67                   1.00

                                          68-79                   0.95

                                          90-91                   0.80

                                          92-120                  0.00

Estimated Operating Expenses         Annual:  $
                                               ----------
(Section 6.a.):                      Monthly: $
                                               ----------

Tenant's Percentage Share            Building 2: 42.12%
(Section 6.a)
                                     Building 3: 100%

                                     Project: 34.85%

Parking Spaces (Section 33):         Reserved: See EXHIBIT A

                                     Unreserved: 4 spaces/l,000 rentable square
                                     feet of the Premises minus the reserved
                                     parking spaces

Landlord's Address (Section 40):     3&71 N. First Street
                                     M/S 120-3
                                     San Jose, California 9513&-1803


                                      11.
<PAGE>


Tenant's Address (Section 40):       3&71 N. First Street
                                     M/S 120-3
                                     San Jose, California 9513&-1803



"Landlord"                                 "Tenant"

Wyse Technology Investments, Inc., a       Wyse Technology, Inc. a Delaware
California corporation                     corporation

By:                                        By:
   ----------------------------------         ----------------------------------

     Name:                                      Name:
     Title:                                     Title:

Date:                                      Date:
     ---------------------------------          --------------------------------


                                     12.
<PAGE>

                                    EXHIBITS

Exhibit A:          Legal Description of Real Property; Floor Plan for
                    Buildings; Calculation of Total Rentable and Useable
                    Square Footage for each Building and the Project; and
                    Site Plan of the Project

Exhibit B-l:        Summary of:

                    1.    Project Operating Expenses for 1990 and 1991

                    2.    Estimate of Project Operating Expenses for 1992
                          and 1993

                    3.    Building Operating Expenses for 1990 and 1991
                          (Segregated by Building l, Building 2 and
                          Building 3)

                    4.    Estimate of Building Operating Expenses for 1992
                          and 1993 (Segregated by Building 1, Building 2
                          and Building 3)

Exhibit B-2:        Summary of:

                    1.    Amenities Expenses for 1990 and 1991

                    2.    Estimated Amenities Expenses for 1992 and 1993

Exhibit C:          Form of Estoppel Certificate

Exhibit D:          Landlord's Normal Business Hours For Operation of HVAC

Exhibit E:          Memorandum of Lease

Exhibit F:          Tenant Insurance Requirements

Exhibit G:          Specifications for Utilities and Services


                                      13.