Exhibit 2



The following is the text of a voting undertaking signed by Giorgio Anania, a
stockholder of Bookham.



                                   UNDERTAKING
                                   -----------

Bookham Technology plc
90 Milton Park
Abingdon
Oxfordshire
OX14 4RY

Nortel Networks Corporation
8200 Dixie Road
Suite 100
Brampton
Ontario
L6T 5P6 Canada

                                                                  7 October 2002

Dear Sirs,

Combination of Bookham Technology plc with the Optical Amplifier and Optical
Transmitter and Receiver Businesses of Nortel Networks Corporation

In consideration of Nortel Networks Corporation entering into an acquisition
agreement, for the sale of the assets included in the optical amplifier and
optical transmitter and receiver businesses of Nortel Networks Corporation and
certain of its subsidiaries (the "Business") to Bookham Technology plc
("Bookham"), a draft of which is attached to this letter marked "A" and
initialled only for the purposes of identification (the "Acquisition"),

I, the undersigned, hereby irrevocably confirm, undertake, warrant and agree for
myself and (in respect of (a) to (c) only) my respective heirs, estates and
successors to and with each of Nortel Networks Corporation and Bookham that:

(a)   I will exercise or procure the exercise of the votes attached to the
      Ordinary Shares (details of which are set out in the Schedule below) for
      the purpose of approving each of the ordinary resolutions numbered one to
      four and the special resolution numbered five (the "Resolutions") as set
      out in the notice of the extraordinary general meeting of Bookham (the
      "Extraordinary General Meeting") which is to be attached to the circular
      to be distributed to the shareholders of Bookham relating, inter alia, to
      the Acquisition (the "Circular"), the final proof of such Circular is
      attached to this letter marked "B" and initialed only for the purposes of
      identification (the "Notice"); such Ordinary Shares are the only shares in
      Bookham in which I am interested;

(b)   I will exercise or procure the exercise in the same way of the votes
      attached to any additional shares that I may acquire from the date hereof;

(c)   I will not, from the date hereof and until that of the Extraordinary
      General Meeting, pledge, sale or otherwise transfer or agree to pledge,
      sell or transfer any of the Ordinary Shares, nor solicit, initiate or
      knowingly encourage any inquiries or proposals from any person wishing to
      acquire them; nor will I cooperate in any way with any person seeking to
      make a takeover offer for Bookham;

(d)   I will convene, or assist in convening, such meetings of the directors of
      Bookham as may be necessary to pass such resolutions as may be necessary
      to enable the Acquisition to be approved and implemented; and

(e)   I hereby consent to the issue of any press announcement or the Circular
      incorporating references to me and this undertaking.

In order to secure the performance of my obligations under this undertaking, I
hereby irrevocably appoint any other director of Bookham to be my attorney in my
name or on my behalf, and agree that this power of attorney is given by way of
security and is irrevocable under and in accordance with the Powers of Attorney
Act 1971.



                                    Schedule

Number of ordinary shares of 1/3 pence each in the capital of Bookham Technology
plc held by me in the following capacities ("Ordinary Shares"):

Capacity                                 Number of Shares
--------                                 ----------------

(a)  Registered Holder                   237,630 Ordinary Shares

(b)  Beneficial Holder                   -

(c)  Holding as Trustee                  -
                                         -----------------------
TOTAL                                    237,630 Ordinary Shares
                                         -----------------------

Executed as a Deed on                    7 October 2002 and Delivered

by the said Giorgio Anania

 /s/ Giorgio Anania
--------------------------


In the presence of

 /s/ Steve Abely
--------------------------
Witness

Name: Steve Abely

Address: Clove Court
         Bushey Drive
         Clanfield OXON 0X8 2TS

Occupation: Chief Financial Officer